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Transit of Mercury in the Spicule Layer. Phil took this great image with his Quantum 6 Scope, Solar Spectrum etalon and PGR Camera.

Welcome to Solar Chat! The best forum for Solar Astronomy
Moving forward from solar cycle 24 to 25

Search found 3367 matches

by Merlin66
Sun Dec 01, 2019 7:11 am
Forum: This is SolarChat !!
Topic: Coronado PST testing
Replies: 15
Views: 199

Re: Coronado PST testing

Alexandra,
I agree with the above Re the ITF.
The stiffness could be the grease/ O Rings hardening.....clean and re-grease May be needed.
Ken
by Merlin66
Wed Nov 27, 2019 10:35 am
Forum: Solar Scope Modifications
Topic: Skywatcher DC Motor drive for PST etalon.
Replies: 22
Views: 335

Re: Skywatcher DC Motor drive for PST etalon.

Rusted, These are actual O ring measurements 47mm x 1.7mm. I bought a minimum batch (20?) and they have been successfully used around the world to "improve" PST's by reducing the slop caused by worn O rings. They are stretched a little to firmly sit in the grooves...the width of the grooves we measu...
by Merlin66
Tue Nov 26, 2019 10:04 pm
Forum: This is SolarChat !!
Topic: "Ghosts in the Machine"
Replies: 17
Views: 245

Re: "Ghosts in the Machine"

Stu, Generally the front window is "sealed" to the camera body to prevent any dust etc. getting inside to the CCD sensor. This being the case, 99% of the dust/ motes should be on the front of the glass window and easily removed. Unfortunately, small particles (from the rear of the innards of the cam...
by Merlin66
Tue Nov 26, 2019 4:05 pm
Forum: Solar Scope Modifications
Topic: Skywatcher DC Motor drive for PST etalon.
Replies: 22
Views: 335

Re: Skywatcher DC Motor drive for PST etalon.

Rusted,
The original PST O rings were 47 mm x 1.7 mm.
by Merlin66
Tue Nov 26, 2019 7:37 am
Forum: This is SolarChat !!
Topic: "Ghosts in the Machine"
Replies: 17
Views: 245

Re: "Ghosts in the Machine"

Stu,
I think Mark is saying that the front sealing glass plate in front of the CCD cover plate was not replaced.
The NR are generated from the CCD cover plate not the protective front cover plate.
by Merlin66
Tue Nov 26, 2019 6:58 am
Forum: This is SolarChat !!
Topic: "Ghosts in the Machine"
Replies: 17
Views: 245

Re: "Ghosts in the Machine"

Mark,
I well understand that approach !!!
After having spent MUCH time cleaning the sensor cover....
I found cleaning (both sides) of the front cover (and fitting/ refitting the O ring!!) just caused more motes to appear on the CCD cover.
Very very frustrating.
Ken
by Merlin66
Tue Nov 26, 2019 5:24 am
Forum: This is SolarChat !!
Topic: "Ghosts in the Machine"
Replies: 17
Views: 245

Re: "Ghosts in the Machine"

Martin,
Yes, tried all that......and fine water spraying the work area before starting....
Didn't make any difference to the small motes on the CCD cover.....
by Merlin66
Mon Nov 25, 2019 10:54 pm
Forum: This is SolarChat !!
Topic: "Ghosts in the Machine"
Replies: 17
Views: 245

Re: "Ghosts in the Machine"

I made a “wiper” using a thin plastic card, cut to a 14mm wide edge. Wrapped in four folds of the KimWipe and sprayed liberally with IPA. One wipe across the CCD cover....dump the KimWipe. Repeat until success. I found brushes and blowers just added more motes!! Used the same technique on the inner ...
by Merlin66
Mon Nov 25, 2019 4:00 am
Forum: This is SolarChat !!
Topic: "Ghosts in the Machine"
Replies: 17
Views: 245

Re: "Ghosts in the Machine"

Rainer,
Hmmmm
OK, but why would that make motes on the surface of the CCD chip more visible????
Ken
by Merlin66
Sun Nov 24, 2019 10:44 pm
Forum: This is SolarChat !!
Topic: "Ghosts in the Machine"
Replies: 17
Views: 245

"Ghosts in the Machine"

A couple of weeks ago I noticed a very small, and tight "Dust Bunnie" - a mote on the CCD glass of my ASI 1600MM. I use an ED80 (f7.5) with the x2.5 PM giving an imaging beam of F18.75 when imaging Ha. Cut to the chase....I set up my ST80 with a plastic bag to get some easier flats ( f 12.5) while c...
by Merlin66
Sat Nov 23, 2019 7:20 am
Forum: Solar Scope Modifications
Topic: Skywatcher DC Motor drive for PST etalon.
Replies: 22
Views: 335

Re: Skywatcher DC Motor drive for PST etalon.

Rusted,
Look forward to seeing the results of your drive unit.
by Merlin66
Fri Nov 22, 2019 8:57 am
Forum: Solar Scope Modifications
Topic: Skywatcher DC Motor drive for PST etalon.
Replies: 22
Views: 335

Re: Skywatcher DC Motor drive for PST etalon.

Rusted,
In a previous thread I’ve detailed the PST etalon construction and the replacement of worn O rings.
viewtopic.php?f=9&t=25461
Getting a semi remote PST etalon tuning will be of interest to many, an easy addition of a drive would be welcome.
by Merlin66
Fri Nov 22, 2019 5:40 am
Forum: Solar Scope Modifications
Topic: Skywatcher DC Motor drive for PST etalon.
Replies: 22
Views: 335

Re: Skywatcher DC Motor drive for PST etalon.

The full travel of the PST etalon tuning is about 160 deg.

Rusted,
Looks promising....not sure how to fit it to a standard PST.....not too many members will be game to dismantle their PST etalon to apply Teflon tape.
by Merlin66
Tue Nov 19, 2019 7:05 am
Forum: Solar Scope Modifications
Topic: Skywatcher DC Motor drive for PST etalon.
Replies: 22
Views: 335

Re: Skywatcher DC Motor drive for PST etalon.

Look forward to seeing your results.....
by Merlin66
Sun Nov 17, 2019 7:48 am
Forum: Solar Scope Modifications
Topic: Upgrade to the Vegemite etalon tuner
Replies: 7
Views: 170

Re: Upgrade to the Vegemite etalon tuner

Rusted,
When you’ve achieved success....look forward to seeing your actual solution.
The PST tilt etalon is much stiffer than the tilt of an external etalon.
I speak from experience.
by Merlin66
Sat Nov 16, 2019 10:58 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 3D printing and SHG
Replies: 15
Views: 425

Re: 3D printing and SHG

Tara,
So far so good!
I would recommend you look at BASS project to process and calibrate your spectral image.
It will allow you to correct for tilt/ smile/ slant, measure FWHM and the R value of your instrument.
https://groups.io/g/BassSpectro
by Merlin66
Sat Nov 16, 2019 9:59 pm
Forum: Solar Scope Modifications
Topic: Upgrade to the Vegemite etalon tuner
Replies: 7
Views: 170

Re: Upgrade to the Vegemite etalon tuner

Brian,
Glad you agree!
I would be interesting to hear from others who have adopted driven etalon tuner solutions.
by Merlin66
Sat Nov 16, 2019 9:50 pm
Forum: Solar Scope Modifications
Topic: Motorized Etalon Tuners
Replies: 5
Views: 149

Re: Motorized Etalon Tuners

Martin,
Well done!
A very elegant solution...
I'm sure it will make your life a bit easier - and your images even better.
by Merlin66
Sat Nov 16, 2019 9:47 pm
Forum: Solar Scope Modifications
Topic: Upgrade to the Vegemite etalon tuner
Replies: 7
Views: 170

Re: Upgrade to the Vegemite etalon tuner

Martin,
Thanks mate!
by Merlin66
Sat Nov 16, 2019 12:19 am
Forum: Solar Scope Modifications
Topic: Upgrade to the Vegemite etalon tuner
Replies: 7
Views: 170

Upgrade to the Vegemite etalon tuner

Well, after almost ten years of use, my Vegemite etalon tuner has been "upgraded" I replaced the "hand controller" lid with a SW electronic motor...extended the control cable (now 5mtr) to allow me to remotely control the etalon tuning from the office. I now have control of focusing, scanning and et...
by Merlin66
Thu Nov 14, 2019 7:57 am
Forum: This is SolarChat !!
Topic: Proms 12th November 2019
Replies: 7
Views: 137

Re: Proms 12th November 2019

Well done, mate!
Some nice images there.
Keep it going.
Ken
by Merlin66
Mon Nov 04, 2019 9:52 pm
Forum: This is SolarChat !!
Topic: How to locate the Dust Bunnies
Replies: 6
Views: 295

Re: How to locate the Dust Bunnies

I've just spent the best part of three days removing dust motes from my ASI 1600!!! A real pain, and very frustrating. I found after cleaning all three surfaces (front/ rear protective glass + CCD chip cover plate) -they were still there! I also found during testing that the results would change??! ...
by Merlin66
Sun Nov 03, 2019 2:11 pm
Forum: This is SolarChat !!
Topic: 3rd November Images
Replies: 7
Views: 302

Re: 3rd November Images

Well done mate!
I'm sure you'll enjoy the DS.
by Merlin66
Sat Nov 02, 2019 4:48 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 3D printing and SHG
Replies: 15
Views: 425

Re: 3D printing and SHG

Very nice results!
Maybe you could suggest on their forum to look at BASS Project for the processing and measurement of the spectral images..
https://groups.io/g/BassSpectro
The program is available here:
https://groups.io/g/BassSpectro/files
Ken
by Merlin66
Sat Nov 02, 2019 7:06 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 3D printing and SHG
Replies: 15
Views: 425

Re: 3D printing and SHG

I agree!
Paul Gerlach has a LOWSPEC 3D design which seems to be popular......
If you’re considering a SHG, then a longer focal length spectrograph, to suit the telescope being used may be more appropriate.
Certainly seems the way of the future.....