Thermal Acclimation of My Lunt50

this is the main message area for anything solar :)
Post Reply
User avatar
marktownley
Librarian
Librarian
Posts: 42120
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 20229 times
Been thanked: 10111 times
Contact:

Thermal Acclimation of My Lunt50

Post by marktownley »

Following the 'smashing' demise of one of the etalons from my trusty Coronado double stacked 40mm scope a year or so ago I was keen to get a new scope to do those quick full frame full disk shots that give that overview of old yellow face. After some careful choosing of a scope I settled on a Lunt50 - a good one that I was able to quality control before purchase and also compare to other scopes. A relatively timely process but worth doing.

Fast forward to several months of use and i'm starting to get familiar with the idiosyncrasies of this scope.

For me the most startling is that this scope really does need some decent thermal acclimation time before it works as it should do. Let me cite examples. If I just whip the scope outside pop it on the mount and observe / image there is quite clear sweetspotting which I can predictably move around the field of view via the pressure tuner. I've found if I leave the scope outside for a while and then observe / image the problem does not exist.

It's now that time of year when I can observe the sun before work if clear in the morning, so what I do is leave the mount in the back yard setup, and then in the morning quickly get the scope / camera out and do my thing. These past couple of days have been clear first thing, with temperatures outside low single figures compared to the high teens the scope is stored inside. The scope is virtually useless with a clear 'on-band' stripe that I can move radially inwards and outwards using the pressure tuner. That time of the morning I do not have time for the scope to acclimate before work (all fast imaging!) and leaving the scope out overnight is not something I want to do (I live in the middle of deep sh!t central!). By this afternoon after work the scope was performing wonderfully again being perfectly on band and no sweetspotting.

I have given the whole thing some thought before throwing this out there, but the only conclusion I can come to is a result of thermal acclimation. I'm wondering what peoples thoughts are or if anyone has any other suggestions.

Mark


Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
User avatar
pedro
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 12236
Joined: Sun May 01, 2016 8:26 pm
Location: Portugal
Has thanked: 14 times
Been thanked: 6556 times
Contact:

Re: Thermal Acclimation of My Lunt50

Post by pedro »

Very interesting Mark. I was able to see the same pattern in a LUNT50 I tested (belonging to a friend)

The scope is virtually useless with a clear 'on-band' stripe that I can move radially inwards and outwards using the pressure tuner


christian viladrich
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 2145
Joined: Sun Jun 14, 2015 4:46 pm
Location: France
Has thanked: 1 time
Been thanked: 2702 times
Contact:

Re: Thermal Acclimation of My Lunt50

Post by christian viladrich »

Very strange. I have no clue what's going on. I hope someone there will come out with a solution.


Christian Viladrich
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/
User avatar
marktownley
Librarian
Librarian
Posts: 42120
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 20229 times
Been thanked: 10111 times
Contact:

Re: Thermal Acclimation of My Lunt50

Post by marktownley »

My next step is going to be to try some kind of blocking over the objective, probably a DERF as i've got a few, see what effect that has. I'm sure that won't be my last experiment.


Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
User avatar
Ibbo
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1425
Joined: Thu Feb 13, 2014 10:13 pm
Location: North of Nottingham England
Has thanked: 2415 times
Been thanked: 1640 times

Re: Thermal Acclimation of My Lunt50

Post by Ibbo »

my Lunt 60 drifts with temp, its a continual tweak for the first 30 mins or so


User avatar
marktownley
Librarian
Librarian
Posts: 42120
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 20229 times
Been thanked: 10111 times
Contact:

Re: Thermal Acclimation of My Lunt50

Post by marktownley »

Thanks Steve. I was talking to Mike Garbett about this and he reminded me how Walter used to say his Lunt100 used to need pointing at the sun for 20 minutes before he could use it, and this mirrors what i'm finding above.

Thing is in the UK it isn't always clear for 20 minutes :)


Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
User avatar
GreatAttractor
Almost There...
Almost There...
Posts: 964
Joined: Sat Jun 01, 2013 1:04 pm
Location: Switzerland
Has thanked: 747 times
Been thanked: 753 times

Re: Thermal Acclimation of My Lunt50

Post by GreatAttractor »

I've also observed the need for an acclimation with my Lunt 50 when used in my mod (with a front D-ERF). I *think* I noticed that for some short time after pointing at the Sun I wouldn't get a detailed image, or that the etalon tuning would drift (sorry, I don't remember exactly). It's possible it was in early spring, with the scope kept in a cool anteroom overnight.

Since then my routine is to first point the scope at the Sun, enable tracking, and spend the next few minutes setting up and connecting the laptop and camera. Afterwards it's good to go.


My software:
Stackistry — an open-source cross-platform image stacker
ImPPG — stack post-processing and animation alignment
My images

SW Mak-Cass 127, ATM Hα scopes (90 mm, 200 mm), Lunt LS50THa, ATM SSM, ATM Newt 300/1500 mm, PGR Chameleon 3 mono (ICX445)
User avatar
Ibbo
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1425
Joined: Thu Feb 13, 2014 10:13 pm
Location: North of Nottingham England
Has thanked: 2415 times
Been thanked: 1640 times

Re: Thermal Acclimation of My Lunt50

Post by Ibbo »

marktownley wrote: Fri Apr 27, 2018 5:08 am Thanks Steve. I was talking to Mike Garbett about this and he reminded me how Walter used to say his Lunt100 used to need pointing at the sun for 20 minutes before he could use it, and this mirrors what i'm finding above.

Thing is in the UK it isn't always clear for 20 minutes :)
Don't I know it :evil: :evil: :evil:


christian viladrich
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 2145
Joined: Sun Jun 14, 2015 4:46 pm
Location: France
Has thanked: 1 time
Been thanked: 2702 times
Contact:

Re: Thermal Acclimation of My Lunt50

Post by christian viladrich »

I was just wondering whether it could make sense to gently warm the etalon. For example with a dew heater set at its lowest.
Ideally, some kind of thermoregulation might help.


Christian Viladrich
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/
User avatar
Valery
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 4059
Joined: Sun Nov 18, 2012 3:13 pm
Has thanked: 156 times
Been thanked: 893 times

Re: Thermal Acclimation of My Lunt50

Post by Valery »

Before I express my opinion/advice, first of all, I need to note that I have no experience of using pressure tuning etalons. So, I can't give any advice concerning use of this etalon type.

I would advice to use another etalon type - an ordinary front mounted etalon! Early years of these etalons Lunt always underlined their very low temperature sensitivity. And this was indeed so. Two my older front mounted etalos requires from very small to no tweaking to the CWL. Etalons wich are so close to the CWL normally do not show any noticeabe banding and are perfectly in band or with minor tilt. These my etalons are SM40 and LS35T Ha.
And they work same fine from subfreezing -10C to very hot >+35C. Blocking filters become a problem much more often. I have four of them. They work differently. At lower temperatures their CWL shifts blue and this can make the image lose contrast due to leacking of light from next to blue etalon transmission peak. My Coronado BF10 works fine even at -10C, but three Lunt (two B1200 and one B500) blokers work differently at lower temp.

I also need to remind that a 20mm etalon working with 50mm aperture never will deliver as wide sweet spot as a front mounted etalon can do.

So, IMHO, the only single best way out in your specific situation is to find such a front mounted etalon (or a telescope with such an etalon) which require (at your typical atmosphere pressure) a very very little tilt to come to the CWL. It must be basically on band and require just a half of a one revolve of a tuning wheel to come to exact CWL. You probably need also a BF which works best at lower temps.

Another way to go is to have a small refractor for your perfectly uniform Quark. 50mm F/8 refractor will give you F/34 at the Quark etalon and 15mm sun disk - prefectly within 20mm Quark etalon. Once you waked up, switch on the Quark at it's best position (for F/34) and it will be already ready for observing when you will be ready to observe.

Sorry for so long list of advices you have not asked for.

Valery.
Last edited by Valery on Sun Apr 29, 2018 6:39 pm, edited 1 time in total.


"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
User avatar
MapleRidge
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 10173
Joined: Fri Jan 13, 2012 11:58 pm
Location: Cambray, ON Canada
Has thanked: 64 times
Been thanked: 4299 times
Contact:

Re: Thermal Acclimation of My Lunt50

Post by MapleRidge »

Hi Mark...

I leave my LS80T and the DSII modded refractor out in the observatory all year round and they are usually close to ambient air temp any time I go out to observe/image. I have never had an issue as you described...I may have to adjust the pressure a bit more than simple tuning if the temperature has changed significantly since the last session but that has been the limit of issues.

If the scope if coming out of the house or other 'warm' storage it certainly will take time to acclimate and if the scope is cooling once outside the pressure in the PT cavity will slowly decrease or increase if it warms in the sun. I could see both situations maybe causing grief.

Not sure if this helps, but my thoughts on the problem.

Brian


Brian Colville

Maple Ridge Observatory
Cambray, ON Canada

Photos: https://www.flickr.com/photos/185395281@N08/albums

10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI462MM

2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM
Derek Klepp
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 12900
Joined: Wed Oct 19, 2011 10:02 am
Been thanked: 171 times

Re: Thermal Acclimation of My Lunt50

Post by Derek Klepp »

Interesting read Mark as you can imagine down here there’s not much of a problem with thermal equilibrium but I do notice with my tilt tuned Lunt a warmer day brings better results.


User avatar
krakatoa1883
Almost There...
Almost There...
Posts: 1041
Joined: Sat Jun 11, 2016 9:41 am
Location: Mediolanum
Has thanked: 153 times
Been thanked: 496 times

Re: Thermal Acclimation of My Lunt50

Post by krakatoa1883 »

Same issue with my own Lunt50, the scope shows a large sweet spot that becomes detectable in FD imaging. I can make the disc almost entirely on band by rotating the handle but this shall be done some time after the scope has been pointed to the Sun. I can't say whether it needs to be "acclimated" in the same sense of an ordinary telescope or if there is some internal component that needs to reach a uniform temperature. BTW, I used my scope even at subzero (°C) temperatures with fine results.

Regarding what Valery said above, one of the most stupid things I have ever done was to sell my previous LS35T for purchasing the LS50....


Raf
My solar images and reports with articles on solar equipment
User avatar
MapleRidge
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 10173
Joined: Fri Jan 13, 2012 11:58 pm
Location: Cambray, ON Canada
Has thanked: 64 times
Been thanked: 4299 times
Contact:

Re: Thermal Acclimation of My Lunt50

Post by MapleRidge »

Hi all...

I missed explaining the conditions that the LS80T is used in at my observatory...winter has been used in as cold as -26C and as warm as 35C in summer...nice comfortable range :lol:

Brian


Brian Colville

Maple Ridge Observatory
Cambray, ON Canada

Photos: https://www.flickr.com/photos/185395281@N08/albums

10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI462MM

2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM
User avatar
GUS
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1298
Joined: Thu May 08, 2014 12:03 pm
Location: Katoomba,NSW,Australia
Has thanked: 102 times
Been thanked: 213 times

Re: Thermal Acclimation of My Lunt50

Post by GUS »

Mark, I have the same issue with both my Lunt scopes using Lunt BF's during winter,the image lacks any detail and can't be tuned with the pressure tuner( for at least half hour or so)If I use Coronado BF's with my Lunt scope's( I have three) I have no issue, a great image straight away. I found in my case, that both mirrors in the Lunt BF's were the cause, I removed the mirror in both and used the BF as a straight thru unit(just taped together temporarily) and the image looked great. Reinstalled the mirror and the image was crap. Removing the mirror back plate initially, the mirror was wedged tight in the BF. If I remove the backplate on a warmer day, the mirror falls out easy, the BF holder seems to be pinching the mirror.


User avatar
marktownley
Librarian
Librarian
Posts: 42120
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 20229 times
Been thanked: 10111 times
Contact:

Re: Thermal Acclimation of My Lunt50

Post by marktownley »

Interesting folks, thanks for your input. Seems i'm not the only person to notice this...


Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
User avatar
Ibbo
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1425
Joined: Thu Feb 13, 2014 10:13 pm
Location: North of Nottingham England
Has thanked: 2415 times
Been thanked: 1640 times

Re: Thermal Acclimation of My Lunt50

Post by Ibbo »

I did wonder if striaght through would be better.
I might machine something up and give it a try.
Do the filters need to be a certain distance apart or does it not matter.


User avatar
marktownley
Librarian
Librarian
Posts: 42120
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 20229 times
Been thanked: 10111 times
Contact:

Re: Thermal Acclimation of My Lunt50

Post by marktownley »

Bit of an update. Had some clear breaks on the way home from work today so decided to try and image. Got back and put the scope on top of a warm radiator while I got set up. Bingo, worked perfectly from the off. Seems to me like this scope prefers to be on the warmer side.


Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
User avatar
Carbon60
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 14171
Joined: Wed Mar 07, 2012 12:33 pm
Location: Lancashire, UK
Has thanked: 8352 times
Been thanked: 8103 times

Re: Thermal Acclimation of My Lunt50

Post by Carbon60 »

Very interesting, Mark. Good to know.

Stu.


H-alpha, WL and Ca II K imaging kit for various image scales.
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
User avatar
marktownley
Librarian
Librarian
Posts: 42120
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 20229 times
Been thanked: 10111 times
Contact:

Re: Thermal Acclimation of My Lunt50

Post by marktownley »

And this mornings update... On the radiator for 20mins which made it nice and warm, however back to the original problem. Next step is to rotate the OTA in the clamshell and see if that makes a difference - wonder if something is sat loose in the assembly? Comparing morning to afternoon the scope would have done a meridinal flip... Just thoughts for the experiment...


Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
User avatar
GUS
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1298
Joined: Thu May 08, 2014 12:03 pm
Location: Katoomba,NSW,Australia
Has thanked: 102 times
Been thanked: 213 times

Re: Thermal Acclimation of My Lunt50

Post by GUS »

If anyone is interested, there have been a couple of threads on CN regarding the use of dew heaters wrapped around the Lunt block filter to bring them on band in cold weather.


User avatar
marktownley
Librarian
Librarian
Posts: 42120
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 20229 times
Been thanked: 10111 times
Contact:

Re: Thermal Acclimation of My Lunt50

Post by marktownley »

I'm using a coronado blocker in this instance GUS, which in the past has been ok, I will try specifically heating the blocker beforehand though. Something else is going on here with the 50, bit of luck trial and error will get to the bottom of it.


Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
User avatar
Bob Yoesle
Almost There...
Almost There...
Posts: 994
Joined: Thu Mar 08, 2012 7:24 pm
Has thanked: 536 times
Been thanked: 806 times

Re: Thermal Acclimation of My Lunt50

Post by Bob Yoesle »

Sounds very familiar to the issues I had with the DSF100 SolarScope filters Mark. They sometimes would present a completely off-band continuum view, and could take up to an hour or more to get to showing a half way decent on-band view. They worked well after reaching thermal equilibrium, but they were a pain in the *@# for real-world use - at least where I live.

They benefited from use of a DERF for improving thermal stability (decreasing IR load - a 50 mm UV/IR filter should do nearly the the same thing), and the ability to get them to near ambient temperatures really helps. See figure 7 and discussion here: https://sunsteinlaw.com/media/Sidorin_solar_filters.pdf


Diagonally parked in a parallel universe.

Curiosity is the father of knowledge; uncertainty is the mother of wisdom.

Dark-Sky Defenders
Goldendale Observatory
User avatar
marktownley
Librarian
Librarian
Posts: 42120
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 20229 times
Been thanked: 10111 times
Contact:

Re: Thermal Acclimation of My Lunt50

Post by marktownley »

You know me Bob, i'm actively exploring the options and possibilities. I do very much suspect we are experiencing pretty much the same thing though...


Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
User avatar
marktownley
Librarian
Librarian
Posts: 42120
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 20229 times
Been thanked: 10111 times
Contact:

Re: Thermal Acclimation of My Lunt50

Post by marktownley »

I thought I would give a bit of an update with this.

I have tried a few things, but still come to no real conclusion. The one thing that repeats itself is that the scope has an off-centred annulus sweetspot that is present when observing 'cool' - which is morning, when the scope is nice and warm in an afternoon it is brilliant with a nice wide on band area - indeed here is a 90 minute animation I took with it a couple of weeks ago, rare to have such a long spell of sunshine in the UK!

Imageha-fd-colour-ani-sm by Mark Townley, on Flickr

The scope once on band stays on band. There is no leaking of pressure either. The lens was loose in the cell - like it rattled, and the erf housing was also loose. All this served to centre the sweet spot better. I think the scope just prefers it with a dose of photons for a while before it works. I need more time with it to try and eliminate some things.

In the mean time i've decided to explore some external 50mm etalon combinations, just waiting for some adaptors to arrive...


Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
User avatar
pedro
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 12236
Joined: Sun May 01, 2016 8:26 pm
Location: Portugal
Has thanked: 14 times
Been thanked: 6556 times
Contact:

Re: Thermal Acclimation of My Lunt50

Post by pedro »

Very interesting Mark, thanks for the update

Please keep us posted. I have some bad experiences with double stack etalons...


User avatar
rsfoto
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 6124
Joined: Mon Jun 18, 2012 8:30 pm
Location: San Luis Potosi, México
Has thanked: 9243 times
Been thanked: 5500 times

Re: Thermal Acclimation of My Lunt50

Post by rsfoto »

Hi Mark,

Interesting and good animation.

Rainer


regards Rainer

Observatorio Real de 14
San Luis Potosi Mexico

North 22° West 101°
User avatar
marktownley
Librarian
Librarian
Posts: 42120
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 20229 times
Been thanked: 10111 times
Contact:

Re: Thermal Acclimation of My Lunt50

Post by marktownley »

The more I experiment with this scope the more i'm convinced the etalon sits loose in the chamber it is housed in. You can definitely hear a 'moving part' in the etalon chamber and it can only be the etalon. The fact I can get the sweetspot as a band implies the etalon is tilted relative to the normal. The fact that I can alter the relative tuning by the angle the scope sits at - ie rotating it in the tube rings just screams loose etalon sitting in the chamber.

I couldn't get it uniformly on band at all this evening and was saying lots of bad words. I did try triple stacking it with another 50mm etalon with results below.

ImageHA-fd-ts-bw by Mark Townley, on Flickr

Not even.

I'm now exploring a few options here, as in it's current form this pressure tuned Lunt simply does not do it for me - too much faffing around to make it work. Firstly disassemble, reassemble and diagnose the LS50 to see what can be improved. Secondly looking at LS50 etalons with a view to double stacking with external etalons for more even larger sweetspot - 50mm etalons are pretty cheap at the moment so I think I will do Valerys trick and shop around for the best ones.


Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
User avatar
marktownley
Librarian
Librarian
Posts: 42120
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 20229 times
Been thanked: 10111 times
Contact:

Re: Thermal Acclimation of My Lunt50

Post by marktownley »

I got the lens spanner out last night and tightened down the cell on the ERF, so will see if that helps.


Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
User avatar
Bob Yoesle
Almost There...
Almost There...
Posts: 994
Joined: Thu Mar 08, 2012 7:24 pm
Has thanked: 536 times
Been thanked: 806 times

Re: Thermal Acclimation of My Lunt50

Post by Bob Yoesle »

Looks to have great contrast when stabilized Mark. excellent imaging BTW!


Diagonally parked in a parallel universe.

Curiosity is the father of knowledge; uncertainty is the mother of wisdom.

Dark-Sky Defenders
Goldendale Observatory
User avatar
marktownley
Librarian
Librarian
Posts: 42120
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 20229 times
Been thanked: 10111 times
Contact:

Re: Thermal Acclimation of My Lunt50

Post by marktownley »

Makes sense. This is why the etalon is flopping around...


Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
User avatar
marktownley
Librarian
Librarian
Posts: 42120
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 20229 times
Been thanked: 10111 times
Contact:

Re: Thermal Acclimation of My Lunt50

Post by marktownley »

Next steps with this, the etalon chamber is coming apart and i'm going to do a rebuild / re-engineer as needed.


Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
Post Reply