SM90 issue?

Use this section to discuss "standard" Baader/Coronado/ Lunt SolarView/ Daystar, etc… filters, cameras and scopes. No mods, just questions/ answers and reviews.
Post Reply
User avatar
DSobserver
Almost There...
Almost There...
Posts: 582
Joined: Sun Feb 19, 2012 2:36 pm
Location: FRANCE
Been thanked: 19 times

SM90 issue?

Post by DSobserver »

Hello

I finally receive last week my SM90II filter that I use on my TSA102 scope.

I notice that, what ever the tunning, I couldn't achieve to get a full Ha coverture in the eyepiece : nearly, but not completely, only sun disk surface is able, when I properly place it, to be in Ha.

Outside it slowly goes to white light wavelength.

Is that normal for such filter?

Other point : did you notice any advantage with the richview system?


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: SM90 issue?

Post by GUS »

Hi, the rich view tuner can be adjusted by repositioning the pin at the front of the etalon a couple of holes one way or the other.The etalon was set for a particular elevation, which may be different from yours,so will need to be adjusted to be able to reach on band.I had to do the same on my SM60 II,about three positions .What I notice with my etalon is that tuning with the T max causes a band of detail(sweet spot) which moves across the disk.If I use the rich view, the sweet spot is more circular.When I set the pin,I made sure that the T max was nearly closed, and then adjusted the richview tuner to get close to on band,then refix the pin. Then i can use a combo of both to get on band.

NB.The T max is usually used for double stacking to get the ghost image out of the view.


User avatar
swisswalter
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 17948
Joined: Thu Feb 06, 2014 4:28 am
Location: Switzerland
Been thanked: 1 time
Contact:

Re: SM90 issue?

Post by swisswalter »

Hi Gus

that is my experience too. Use the t-max to get rid of the gost, fine Tuning with the rich view


Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)
User avatar
DSobserver
Almost There...
Almost There...
Posts: 582
Joined: Sun Feb 19, 2012 2:36 pm
Location: FRANCE
Been thanked: 19 times

Re: SM90 issue?

Post by DSobserver »

ok, thanks for the advices, I'll try asap


User avatar
DSobserver
Almost There...
Almost There...
Posts: 582
Joined: Sun Feb 19, 2012 2:36 pm
Location: FRANCE
Been thanked: 19 times

Re: SM90 issue?

Post by DSobserver »

I could quickly try this this afternoon, and I think it works!

I need to check again during better conditions


axlefoley
Im an EXPERT!
Im an EXPERT!
Posts: 284
Joined: Thu Feb 13, 2014 3:22 am
Location: Townsville Australia

Re: SM90 issue?

Post by axlefoley »

I had to move the pin 2 holes to achieve focus.


Alan
User avatar
Merlin66
Librarian
Librarian
Posts: 3970
Joined: Tue Dec 13, 2011 1:23 pm
Location: Junortoun, Australia
Has thanked: 173 times
Been thanked: 615 times
Contact:

Re: SM90 issue?

Post by Merlin66 »

Richview tuning v's tilt tuning???
I have asked this question before....
On the ol' original SM60/90 external etalons (I have the SM60), the T max tilter screw brings the tuning from the red wing down through the "on band" and into the blue wing.

If the etalon is tilted to move the ghosts, then it would end up sitting in the blue wing (or beyond)
I therefore have to assume that the Richview tuner effectively reverses this effect of the tilt by reducing the gap between the etalon plates and moving the bandwidth back up towards the central "on band"
Is this what is actually seen? a move from the blue to the red?


"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy  
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
User avatar
swisswalter
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 17948
Joined: Thu Feb 06, 2014 4:28 am
Location: Switzerland
Been thanked: 1 time
Contact:

Re: SM90 issue?

Post by swisswalter »

Hi Ken

that seems to me a very sound explanation to what is really happening


Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)
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: SM90 issue?

Post by GUS »

Hi Ken, that seems to be the case.I think this is also the reason coronado double stack filters( RICHVIEW) did not have to go back to factory for double stacking as the previous max scope/solarmax filters supposedly had to.There seems to be more tuning range with the RV tuner, and the T max is only really needed for double stacking. I can use a SM 60 II etalon on my other scopes without the T max and it works fine
Thanks.
GUS


User avatar
Merlin66
Librarian
Librarian
Posts: 3970
Joined: Tue Dec 13, 2011 1:23 pm
Location: Junortoun, Australia
Has thanked: 173 times
Been thanked: 615 times
Contact:

Re: SM90 issue?

Post by Merlin66 »

I've been using a pair of original SM60 etalons double stacked on the ED80 for the past few years.
They never went anywhere near Meade/Coronado for "double stacking alignment"!!!
The hardest part, other than achieving good tuning, was obtaining the adaptor ring to fit a T Max thread to the front of a SM60 etalon.
It would be interesting to know if the "two hole reset" is a consequence of the amount of tilt required to move the ghost image....


"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy  
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
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: SM90 issue?

Post by GUS »

I went through three SM 60 II filters and one SM 40 II filter (due to the central obstruction coming loose)and each one of them was set differently for tuning.Some would not show any detail with the tuner until i used the T max opened nearly all the way, while others showed detail with the T max completely closed, or partially opened.The pin position allows for differences in altitude and probably in manufacturing tolerances. I remember reading the coronado manual that came with my Solarmax 40 scope with the older etalon and it mentioned returning to factory for DS.


User avatar
marktownley
Librarian
Librarian
Posts: 42274
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 20442 times
Been thanked: 10248 times
Contact:

Re: SM90 issue?

Post by marktownley »

Merlin66 wrote:Richview tuning v's tilt tuning???
I have asked this question before....
On the ol' original SM60/90 external etalons (I have the SM60), the T max tilter screw brings the tuning from the red wing down through the "on band" and into the blue wing.

If the etalon is tilted to move the ghosts, then it would end up sitting in the blue wing (or beyond)
I therefore have to assume that the Richview tuner effectively reverses this effect of the tilt by reducing the gap between the etalon plates and moving the bandwidth back up towards the central "on band"
Is this what is actually seen? a move from the blue to the red?
The Richview tuning works in exactly the same way as the tuning with a PST etalon works. It even uses the same orange foam for the etalon to sit on and tilt...


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
DSobserver
Almost There...
Almost There...
Posts: 582
Joined: Sun Feb 19, 2012 2:36 pm
Location: FRANCE
Been thanked: 19 times

Re: SM90 issue?

Post by DSobserver »

To get proper wavelengh, I had to move the pin 4-5 holes

Mark summarize it well : with the richview, I manage to get proper setting on the whole field (in my case the Ha view arrive from the north side to the south), same as in the PST

The T-max is now nearly close


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: SM90 issue?

Post by GUS »

Hi Mark, how does the richview tilt the etalon? The pin seems to press down centrally and the foam seems to be of even thickness.


User avatar
marktownley
Librarian
Librarian
Posts: 42274
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 20442 times
Been thanked: 10248 times
Contact:

Re: SM90 issue?

Post by marktownley »

Etalons like this are wedge shaped, it is also pushing down on the perimeter aswell as the centre, when pressure is applied on the etalon it causes the etalon to tilt.


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: SM90 issue?

Post by GUS »

Thanks Mark.


Post Reply