Search found 3618 matches

by Merlin66
Mon Mar 01, 2021 10:45 pm
Forum: This is SolarChat !!
Topic: Recommended ZWO camera for CaK
Replies: 15
Views: 179

Re: Recommended ZWO camera for CaK

Here in Australia I just use the uncooled ASI 1600MM (and the ASI 174MM). No issues so far. I cheat a bit with the colouring.... I use Irfanview (freeware) "Image/ colour corrections" and set up a colour scheme for Ha, WL, CaK etc. The CaK is RGB = 25/-5/105 WL is RGB = 75/38/22 Ha surface 84/-14/-1...
by Merlin66
Mon Mar 01, 2021 12:38 am
Forum: This is SolarChat !!
Topic: Recommended ZWO camera for CaK
Replies: 15
Views: 179

Re: Recommended ZWO camera for CaK

I’m currently using an ASI1600MM for all my solar imaging, CaK, Ha and WL. I usually can get around f15 to f18 with my average to poor seeing conditions. Using an ED80 with TV or Baader Barlow’s. Stopped down to 60mm for CaK. Frame rates for ROI are very. Good. 090839.jpg Sun_090622.jpg Sun_085823.j...
by Merlin66
Sat Feb 20, 2021 1:20 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Another ASI 178MM Question
Replies: 11
Views: 148

Re: Another ASI 178MM Question

IMHO, I think it is due to the very small pixels and us trying to use it at 1x1 binning.
Doesn’t seem to be related to the shutter.
by Merlin66
Fri Feb 19, 2021 4:27 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Another ASI 178MM Question
Replies: 11
Views: 148

Re: Another ASI 178MM Question

I found the extensive thread on CN Re FPN with the ASI 178. It seems to be the same problem I experienced with an ASI 183MM. I returned it to ZWO and replaced with a ASI 1600MM. https://www.cloudynights.com/topic/700403-pattern-noise-with-asi178mm-non-cooled-with-h-alpha-imaging/ (Google ASI 178MM F...
by Merlin66
Fri Feb 19, 2021 3:29 am
Forum: This is SolarChat !!
Topic: New Sunspot on the NE limb
Replies: 5
Views: 86

Re: New Sunspot on the NE limb

Thanks for the heads up.
Could be interesting over the next couple of weeks.
by Merlin66
Fri Feb 19, 2021 3:27 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Another ASI 178MM Question
Replies: 11
Views: 148

Re: Another ASI 178MM Question

Hmmmm.
I've just ordered an ASI 178MM for my small(er) SHG.
I hadn't heard of any fixed pattern noise issues.
Do you have any sample images???
by Merlin66
Tue Feb 16, 2021 4:45 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: A hydrogen spectrum tube-- for fun and etalon testing
Replies: 20
Views: 405

Re: A hydrogen spectrum tube-- for fun and etalon testing

Paul’s 3D printed LowSpec instrument is giving very good performance and is very cost effective. https://www.thingiverse.com/thing:2455390 Well supported on the https://groups.io/g/astronomicalspectroscopy Many of us use BASS Project for Spectral processing. It has a comprehensive manual and well su...
by Merlin66
Fri Jan 22, 2021 10:23 pm
Forum: Solar Scope Modifications
Topic: DIY Solar Scintillation Seeing Monitor with FC support
Replies: 114
Views: 39432

Re: DIY Solar Scintillation Seeing Monitor with FC support

Any updates on this project?
Any changes/ improvements over the past three years?
by Merlin66
Sat Jan 09, 2021 7:22 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Prism or mirror diagonal best for solar Ha?
Replies: 22
Views: 508

Re: Prism or mirror diagonal best for solar Ha?

Only if you want to use polarized filters to attenuate the light throughput.
by Merlin66
Sat Jan 02, 2021 7:49 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: SM2 to SM3 stacking question answered
Replies: 36
Views: 861

Re: SM2 to SM3 stacking question answered

I may be Scots by birth, I’m Australian by choice. 🇦🇺
by Merlin66
Sat Jan 02, 2021 3:25 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: SM2 to SM3 stacking question answered
Replies: 36
Views: 861

Re: SM2 to SM3 stacking question answered

James,
The Pommie Marmite is a poor copy of our Vegemite ;)
You'll find fitting a drive well worth the effort.
by Merlin66
Sat Jan 02, 2021 2:09 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: SM2 to SM3 stacking question answered
Replies: 36
Views: 861

Re: SM2 to SM3 stacking question answered

James,
Sounds like you need to buy some Vegemite!
I've used the Vegemite lid drive for over ten years....well worth trying. Certainly makes life much easier.....
by Merlin66
Fri Jan 01, 2021 5:00 am
Forum: Solar Scope Modifications
Topic: Evaluating the PST etalon with a neon bulb
Replies: 15
Views: 486

Re: Evaluating the PST etalon with a neon bulb

Bob, Looked at your images.... I think to collect and analyse useful data a more robust and repeatable set-up is needed. Too much variation at the moment . Measuring field angle?? The attached shows the ring spacings and the FWHM of the rings. (The second image was not good enough to properly analys...
by Merlin66
Fri Jan 01, 2021 4:32 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: SM2 to SM3 stacking question answered
Replies: 36
Views: 861

Re: SM2 to SM3 stacking question answered

KISS...... I make use of the Skywatcher/Orion electronic motors and controllers. Cheap and effective. Use them belt geared for all the focusers (six at the last count!) The nominal 9V SW controller also drives the micromotor (variable speed). https://www.ebay.com.au/itm/DC-6V-12V-5RPM-10RPM-Full-Met...
by Merlin66
Thu Dec 31, 2020 10:07 pm
Forum: Solar Scope Modifications
Topic: Evaluating the PST etalon with a neon bulb
Replies: 15
Views: 486

Re: Evaluating the PST etalon with a neon bulb

Building a high resolution spectrograph is not difficult, or necessarily expensive, but it does require some attention to detail and careful workmanship. An adjustable slit, a couple of binocular objectives from Surplus Shed and a reflective diffraction grating from Optometrics are the main componen...
by Merlin66
Thu Dec 31, 2020 5:14 pm
Forum: Solar Scope Modifications
Topic: Evaluating the PST etalon with a neon bulb
Replies: 15
Views: 486

Re: Evaluating the PST etalon with a neon bulb

Bob, I designed and manufactured the original Spectra-L200 Littrow spectrograph. This is capable of achieving up to R=10000. I also have a couple of Classic spectrographs, an "MG80" spectrograph made from readily available commercial components and various spectroheliographs. Unfortunately the only ...
by Merlin66
Thu Dec 31, 2020 7:53 am
Forum: Solar Scope Modifications
Topic: Advices needed on doublestacking Daystar Quark Chrom and PST Etalon
Replies: 24
Views: 623

Re: Advices needed on doublestacking Daystar Quark Chrom and PST Etalon

The PST etalon will be OK behind the ERF.
It may be better getting both etalons on a NR if the PST was up front....don’t know but well worth trying.
by Merlin66
Thu Dec 31, 2020 7:48 am
Forum: This is SolarChat !!
Topic: White Light imaging with narrowband filters
Replies: 11
Views: 241

Re: White Light imaging with narrowband filters

Correction...
The Baader K line filter is a wide band “continuum “ which also covers the CaK.
by Merlin66
Thu Dec 31, 2020 4:41 am
Forum: Solar Scope Modifications
Topic: Evaluating the PST etalon with a neon bulb
Replies: 15
Views: 486

Re: Evaluating the PST etalon with a neon bulb

Bob, OK. I have a few (!!!) spectrographs which are capable of resolving down to 0.26A but for this experiment it may not be necessary... If a reference wavelength (Ha) is used and we image the F- P rings we could determine both the spacing and the FWHM by accurately recording the spacing and FWHM i...
by Merlin66
Thu Dec 31, 2020 12:35 am
Forum: Solar Scope Modifications
Topic: Evaluating the PST etalon with a neon bulb
Replies: 15
Views: 486

Re: Evaluating the PST etalon with a neon bulb

Bob, Interesting. As the CWL will vary with tilt (or Rich view tuning, or pressure tuning) and we do want occasionally to record the solar features off-band, what's the relationship of the data you collected to the FWHM performance? There's a review of commercial etalons: https://www.researchgate.ne...
by Merlin66
Wed Dec 30, 2020 7:06 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: SM2 to SM3 stacking question answered
Replies: 36
Views: 861

Re: SM2 to SM3 stacking question answered

James, Using the SM60II etalon adds a new dimension to the tuning of the DS. The original SM60 etalons were both null tuned to the red wing, is meant that once they were tuned together they effectively became a “solid” narrow band filter. Any tilt tuning of the pair seemed to maintain the CWL of eac...
by Merlin66
Tue Dec 29, 2020 10:29 pm
Forum: Solar Scope Modifications
Topic: Advices needed on doublestacking Daystar Quark Chrom and PST Etalon
Replies: 24
Views: 623

Re: Advices needed on doublestacking Daystar Quark Chrom and PST Etalon

The Quark is tuned by heating only, there’s no cooling option. I can’t remember the on band temperature (30 deg C?) but if the ambient temperature is higher there well may be a problem. When I looked at getting a Quark for use here in Australia, the temperatures can easily get to 45 deg plus, Daysta...
by Merlin66
Tue Dec 29, 2020 10:04 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: SM2 to SM3 stacking question answered
Replies: 36
Views: 861

Re: SM2 to SM3 stacking question answered

Talking about DS set-ups....
I used a pair of SM60 etalons on the ED 80 for many years. They worked well for me.
Sold one....then regretted that!!
Replaced it with an SM60 II etalon. The old SM60 screws directly to the front of the SM60 II.
No issues so far.
by Merlin66
Tue Dec 29, 2020 9:45 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Solar image size affected by focal extenders/reducers
Replies: 9
Views: 434

Re: Solar image size affected by focal extenders/reducers

Most of the generic 0.5 reducers seem to work OK.
I use an ATiK reducer and also have a GSO version.
by Merlin66
Mon Dec 28, 2020 5:08 am
Forum: Solar Scope Modifications
Topic: Evaluating the PST etalon with a neon bulb
Replies: 15
Views: 486

Re: Evaluating the PST etalon with a neon bulb

A very interesting post. I think the wide spread of the neon spectrum is not ideal for this sort of evaluation. (See attached) neon2.gif Possibly a laser pointer with a defined emission wavelength would be better. I use Bass Project (https://groups.io/g/BassSpectro) for all my spectral processing. I...