Stu,
Using a 10mm grating in 2nd order is marginal. Most gratings used are 25mm or 30mm sq.
I’d recommend you try to calibrate a reference lamp to verify resolution and tune the grating rotation.

Stu,
Making some guesses about slit gap (20 micron) and spacing between the grating and the imaging lens (100mm), I've put your parameters into the Simspec spreadsheet.

Stu,
Understood.
The SimSpec Spreadsheet will help confirm your design and the probable resolution etc. Just enter your data....

Stu, The collimator must match the incoming beam. This means your 50mm lens is working at f10. This will probably suit your smaller 10mm grating...It’s also usual for the imaging lens to be the same or less than the collimator focal length. Pencil sharpener blades with the bevel facing the collimato...

Well done Martin!
Looks like you have a great white light set-up.
Just a note. Al's collimating tool (http://www.iceinspace.com.au/forum/show ... ool&page=2) is a very good tool to assist in collimating.

Stu,
What's the design of your spectrograph?
I use BASS Project (https://groups.io/g/BassSpectro) for all my spectral processing....

Wah,
""
Some optical glass slits have been used
""
The OVIO reflective slit plates????

Wah,
Give me some time to find the files.
I'll email you when I'm ready.
ken

I think it just didn't run.....
(Been a while now due to weather and other issues. I could probably find the file on the computer and check if needed.

Wah,
I've been trialling a fast frame ASI 174MM camera on the SHG, using the x2 RA speed to reduce acquisition time. ( Using an ROI just enough to get the spectral line, I can get up to 400 fps)
The SER files can be up to 3Gb in size....this seems to be an issue for SLM?
Ken

Wah,
Glad to see you back.
I think 3D printing is the way forward. Paul has been active producing his LowSpec spectroscope design, a great introduction to slit spectroscopy.
Are you going to update your SLM software to allow larger files???

Well done, Martin!
Nice to see your new set-up.
Hopefully the weather will be kind to you.
Ken

Taipan,
Most secondary etalon filters require some “clocking” ie rotating relative to the front of the scope to find the best alignment.

Wah,
According to the description given....yes, something like that!
I was told it definitely was not tilt tuning, or that the spacers were flexible enough to be squeezed.....

Wah,
Basically yes. The pressure/ counter pressure close to the edge seems to distort the plates to effectively increase the gap between them.

In my recent book “Imaging Sunlight” - Springer there’re a good chapter on the etalon function and current available solar filters.

Download Irfanview.
This allows cropping and re-sizing of many image formats.
https://www.irfanview.com/

As Mark says, it's not located inside the tube assembly of the telescope. It's found on the front of the blocking filter diagonal which holds the eyepiece. (There are actually two filters in a blocking diagonal - the one at the front, usually looks like a bright mirror surface, this is the ITF. The ...

PST serial numbers don't mean much..... If the PST has a "blue" objective then it's either relatively new or has had the objective replaced (with an internal ITF added at the eyepiece holder). Unless the instrument has been dropped and the etalon damaged....there's not much else to go wrong. 99% of ...

Yes, there is limited storage on the forum....
I use Dropbox as a mechanism to transfer larger files.

No, the Coronado ITF is a completely different design.
If it fails, the Maier Photonics replacement is a drop in replacement.

In a recent post he says: """ Lunt were able to tell me that the blue glass is a UV Cut filter. The newest version has a coating to inhibit this build up. They also confirmed it was OK to try and clean the old BG filter and suggested CLR. """ I'm following it up with "Anthony" the member on SGL.....

https://luntsolarsystems.com/shop/solar-products/hydrogen-alpha/lunt-replacement-parts/blue-glass-for-lunt-blocking-filters/ I see there are reports, on SGL, that the replacement Lunt "Blue" filters for the BF assembly are "coated" for additional protection.. I'm unable to confirm. Does anyone have ...

Another thought I have is that when long AVI’s are used, say 3000 frames the “best” 100 or 5% etc will be taken from the whole AVI - some may be at the beginning, some in the middle and some at the end. To me this could lead to surface, or prom movements being blurred due to movement in the detail d...

My solar telescopes, White light, H alpha and CaK are mounted on a SW HEQ5 mount. When properly polar aligned I don’t need to use any additional guiding software and generally just use sidereal tracking. This keeps the solar disk in the FOV for as long as I want. The only “additional” controls I use...