Search found 142 matches

by Oak
Fri Mar 15, 2024 11:42 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: 3D-printed Baader 160mm ERF Holder
Replies: 7
Views: 286

Re: 3D-printed Baader 160mm ERF Holder

Well, I do have a thermal camera so stay tuned. I think that's a good idea. I will take a photo when I get a chance. I've also been wanting to see how unevenly the quark heats (not on telescope). I left a bit over 1mm of space all around to account for thermal expansion. The ERF rattles a bit in the...
by Oak
Wed Mar 13, 2024 11:18 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: 3D-printed Baader 160mm ERF Holder
Replies: 7
Views: 286

Re: 3D-printed Baader 160mm ERF Holder

I do think metal would be superior in terms of strength and durability. However, the ERF holders from Baader are 3D printed anyway and quite pricey. (Looks like ASA https://www.baader-planetarium.com/en/frame-for-d-erf-filters-75-180mm.html) My version is much uglier, but easy to mount on scopes of ...
by Oak
Sun Mar 10, 2024 1:02 pm
Forum: Solar Scope Modifications
Topic: 150mm/1200mm Ha Refractor Mod
Replies: 5
Views: 312

Re: 150mm/1200mm Ha Refractor Mod

Very nice! What is the rail system(s) you are using? Does it hold collimation well? Looks like just the 60mm sub aperture ERF?

I have a 152mm objective that I will eventually convert into an open frame solar scope so interested in ideas.

-Derek
by Oak
Sun Mar 10, 2024 12:57 pm
Forum: Solar Scope Modifications
Topic: "Pocket" double stack Lunt 40 on Solarquest mount
Replies: 5
Views: 304

Re: "Pocket" double stack Lunt 40 on Solarquest mount

Nice! Held on to the askar by friction?
by Oak
Tue Mar 05, 2024 1:57 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: What does it take to binoview the full disc in H-alpha?
Replies: 10
Views: 444

Re: What does it take to binoview the full disc in H-alpha?

Great that it is working. I mostly use 25mm plossls with mine. Now of course desire for a double stack will set in.... In terms of tuning I usually find it best to try for the darkest filaments on the disk (not proms) . Brightest plage is also part of it but that seems more difficult for me to deter...
by Oak
Sun Mar 03, 2024 2:29 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: 3D-printed Baader 160mm ERF Holder
Replies: 7
Views: 286

Re: 3D-printed Baader 160mm ERF Holder

Thanks. The square shape makes it possible to get something that fits a bigger telescope printed on a smaller printer. Also easy to swap erfs and telescopes with the modular design.
by Oak
Sat Mar 02, 2024 8:06 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: 3D-printed Baader 160mm ERF Holder
Replies: 7
Views: 286

3D-printed Baader 160mm ERF Holder

Hi All, In case it is useful to someone, I am attaching a link to a 3D-printed holder for a Baader 160mm ERF that I use on my C6SCT and AT102ED. A bit rough, but it gets the job done. The .step and fusion 360 files are at the link as well so it would be easy to resize for other ERFs or telescopes. h...
by Oak
Sat Mar 02, 2024 3:42 pm
Forum: Solar Scope Modifications
Topic: Small Etalon Improvement For Only $15 USD (13 Euros)
Replies: 91
Views: 20502

Re: Small Etalon Improvement For Only $15 USD (13 Euros)

Seems odd. Did you try with just the Lunt 40 or only in double stack? Probably the Velcro tape is not totally necessary anyway.
by Oak
Sat Feb 24, 2024 9:59 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: What does it take to binoview the full disc in H-alpha?
Replies: 10
Views: 444

Re: What does it take to binoview the full disc in H-alpha?

Here's the 3D printed double stack adapter. You can see how it attaches to the stock Lunt 40mm etalon. The dedicated double stack has a threaded adapter on the front and replaces the primary etalon. https://www.printables.com/model/338055-lunt-40mm-double-stack-adapter For my Lunt 40mm double stack,...
by Oak
Wed Feb 21, 2024 6:45 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: What does it take to binoview the full disc in H-alpha?
Replies: 10
Views: 444

Re: What does it take to binoview the full disc in H-alpha?

I've been able to binoview with the b500 and b1200 on my Lunt 40 (see link below). I prefer the b1200, but that may be idiosyncratic to the two filters and not a function of size. https://www.cloudynights.com/topic/853336-successful-binoviewing-with-lunt-40mm-b500/ For double stacking the 40 , you m...
by Oak
Thu Feb 08, 2024 2:28 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Using Sol'Ex with Lunt Etalon
Replies: 3
Views: 213

Re: Using Sol'Ex with Lunt Etalon

Well, that's one way to determine the etalon is on band...

You should be able to measure the Lunt fwhmn fairly easily this way too.
by Oak
Tue Oct 24, 2023 4:23 am
Forum: Solar Scope Modifications
Topic: Lunt 40 mod basics.
Replies: 24
Views: 3630

Re: Lunt 40 mod basics.

Thanks for clarifying.
by Oak
Tue Oct 24, 2023 3:46 am
Forum: Solar Scope Modifications
Topic: Lunt 40 mod basics.
Replies: 24
Views: 3630

Re: Lunt 40 mod basics.

These old Lunt 35 posts may be helpful as there are a few diagrams scattered throughout. I don't understand why the collimating and refocusing lenses need to be the same +/- focal length though. https://solarchatforum.com/viewtopic.php?t=11271 https://solarchatforum.com/viewtopic.php?t=13382 https:/...
by Oak
Thu Oct 19, 2023 2:49 am
Forum: Solar Scope Modifications
Topic: Question about H-alpha double stacking
Replies: 37
Views: 3821

Re: Question about H-alpha double stacking

To avoid ghost images, I have found some rules: spacing the 2 etalons as much as possible I use 30mm BF30 isle of man. if I put it at the end just before eyepieces, I have reflections. If I use a binoviewer, the long path avoids most of reflections So I put the BF 30 between the two lunt40 modules....
by Oak
Tue Oct 17, 2023 5:40 pm
Forum: Solar Scope Modifications
Topic: Question about H-alpha double stacking
Replies: 37
Views: 3821

Re: Question about H-alpha double stacking

Impressive Sebastien, looks like a setup without compromises. Derek: have you tried to add spacers between the etalons to get more distance between them? Not yet although that is next on the list. Perhaps put one etalon on each side of the blocker. I did try a circular polarizer and that darkened t...
by Oak
Tue Oct 17, 2023 4:57 pm
Forum: Solar Scope Modifications
Topic: Question about H-alpha double stacking
Replies: 37
Views: 3821

Re: Question about H-alpha double stacking

I have also been trying this but lots of reflections between the two lunt 40mm etalons and my view with quark+LS40 was superior to the tz4+LS40+LS40+b1200.

Where/what is the blocking filter in the double lunt 40 setup?
PXL_20230826_204214114.jpg
PXL_20230826_204214114.jpg (4.65 MiB) Viewed 1761 times
by Oak
Thu Oct 12, 2023 12:44 pm
Forum: This is SolarChat !!
Topic: Is this dangerous?
Replies: 18
Views: 2483

Re: Is this dangerous?

Oh good, thanks Dennis, I have a 160mm DERF I need a cell for, but don't have the money for it till next summer. Ed had me worried there ;) Alexandra Fairly straightforward to 3D print a cell as well (which is what the Baader one seems to be ). I made a modular cell for my 160mm Baader DERF that fi...
by Oak
Wed Oct 04, 2023 11:07 pm
Forum: This is SolarChat !!
Topic: Tuning Quark a little differently.
Replies: 19
Views: 2230

Re: Tuning Quark a little differently.

Great idea. About how many turns did you put in/out with the screws?
by Oak
Thu Sep 28, 2023 11:38 pm
Forum: This is SolarChat !!
Topic: 24.9.23: First time Double Stack H-a test
Replies: 12
Views: 1314

Re: 24.9.23: First time Double Stack H-a test

It should fit without the white housing. I think the only difference between the two etalons is that black thread adapter at the end, which looks like a about 5-6mm based on how it sits under the lens cap. Ive asked Lunt what the dimensions are, but no response yet. With the ERF housing, there is 2m...
by Oak
Mon Sep 25, 2023 5:10 pm
Forum: This is SolarChat !!
Topic: 24.9.23: First time Double Stack H-a test
Replies: 12
Views: 1314

Re: 24.9.23: First time Double Stack H-a test

Got it. I keep the ERF on mine out of laziness (and I use the white etalon housing with some ptfe washers to compression tune the etalon). Don't know what the transmission is, I think the ERF itself is around 80% but I don't have a source or numbers to back up that claim.
by Oak
Mon Sep 25, 2023 2:44 pm
Forum: This is SolarChat !!
Topic: 24.9.23: First time Double Stack H-a test
Replies: 12
Views: 1314

Re: 24.9.23: First time Double Stack H-a test

Great images! Glad it's working. The focuser after the etalon is for fine adjustment?

-Derek
by Oak
Sun Sep 10, 2023 8:18 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Quark and Lunt 40mm etalon FSR and FWHM measurements with a DIY spectroheliograph
Replies: 4
Views: 1050

Re: Quark and Lunt 40mm etalon FSR and FWHM measurements with a DIY spectroheliograph

Thanks for measuring this, interesting with the TZ4 and the Lunt40. BTW do you know the aproximate peak transmission of Quark etalons? Haven't measured overall transmission. Will attempt when the weather clears. I needed to remove the quarks blocker to get enough signal to measure. Certainly the lu...
by Oak
Sun Sep 10, 2023 8:12 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Yet another 3D printed SHG
Replies: 9
Views: 1452

Re: Yet another 3D printed SHG

Weighed the SHG today as well.

1755g without camera.
1911g with ASI174MM.
by Oak
Sun Sep 10, 2023 2:56 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Quark and Lunt 40mm etalon FSR and FWHM measurements with a DIY spectroheliograph
Replies: 4
Views: 1050

Quark and Lunt 40mm etalon FSR and FWHM measurements with a DIY spectroheliograph

Hi All, I recently completed a 3D-printed DIY SHG described here: https://solarchatforum.com/viewtopic.php?p=401631#p401631 It’s cloudy this weekend so I set up a (hopefully) collimated beam and used my new SHG to observe the transmission lines from a quark and Lunt 40mm etalon in single and double ...
by Oak
Sun Sep 10, 2023 2:12 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Yet another 3D printed SHG
Replies: 9
Views: 1452

Re: Yet another 3D printed SHG

Cloudy this weekend so I set up a (hopefully) collimated beam and used the SHG to observe the transmission lines from a quark and Lunt 40mm etalon in single and double stack in a few configurations. All without blocking filters to increase transmission. You can see an increase in free spectral range...
by Oak
Sat Sep 09, 2023 6:31 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Yet another 3D printed SHG
Replies: 9
Views: 1452

Re: Yet another 3D printed SHG

Hi, Looks like the lenses are still available in the used market and quite cheap https://www.ebay.com/itm/204444735582?hash=item2f99db185e:g:yIQAAOSwwdNjdzgE Could this be turned into a Night Spectropgraph for stars ? What would the recommended telescope f/x be? regards Rainer Yes, the lenses are f...
by Oak
Thu Sep 07, 2023 3:44 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Yet another 3D printed SHG
Replies: 9
Views: 1452

Re: Yet another 3D printed SHG

Hi Everyone,

The .stl files for the SHG are now up on printables (link below). Step/fusion360 files to follow in a few days.

https://www.printables.com/model/571271 ... heliograph

-Derek
by Oak
Wed Sep 06, 2023 8:09 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Yet another 3D printed SHG
Replies: 9
Views: 1452

Re: Yet another 3D printed SHG

Wow, that looks really nice. Just to be clear, you're using a 2-inch fitting to attach to the telescope (I didn't want others to misunderstand). A 1.25-inch fitting will not be strong enough and likely will cause some vignetting for many telescopes. Using the built-in helical focusers of the camera...
by Oak
Wed Sep 06, 2023 3:20 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Yet another 3D printed SHG
Replies: 9
Views: 1452

Yet another 3D printed SHG

Hi All, I just wanted to share the construction of my new SHG - thanks very much to Doug Smith and Brian Martin for their designs, slit, and 3D CAD files. This SHG is made using one of Doug’s custom slits, two 150mm super-takumar lenses, and a 30mm square 2400 l/mm grating from edmund optics. T-moun...
by Oak
Tue Sep 05, 2023 5:00 pm
Forum: Solar Scope Modifications
Topic: Quark + Lunt 40mm double stack at 102mm aperture
Replies: 23
Views: 6424

Re: Quark + Lunt 40mm double stack at 102mm aperture

A 4x telecentric (baaderTZ4) would give you tighter bandpass with the quark combo. Definitely worth the decrease in overall intensity. Ideally, you want to be around f40 for the mica etalons. The quark+telecentric should also work on the back of another H-Alpha scope. The quark replaces the blocking...
by Oak
Sat Sep 02, 2023 8:34 pm
Forum: Solar Scope Modifications
Topic: Quark + Lunt 40mm double stack at 102mm aperture
Replies: 23
Views: 6424

Re: Quark + Lunt 40mm double stack at 102mm aperture

vineyard wrote: Sat Sep 02, 2023 2:46 pm Thanks both. Ah I see - I have the combo quark which doesn't have the built in telecentric. I guess this mod won't work for my kit then - ah well. Cheers!
It will work well with the quark combo. A telecentric amplifier is required before the combo anyway. How else are you getting to F30+?
by Oak
Sat Sep 02, 2023 12:06 pm
Forum: Solar Scope Modifications
Topic: Quark + Lunt 40mm double stack at 102mm aperture
Replies: 23
Views: 6424

Re: Quark + Lunt 40mm double stack at 102mm aperture

This quark has the built in telecentric. Also works with Lunt40+TZ4+blocker and no quark better than I thought would. I've been trying just the Lunt 40 mm etalons with a negative meniscus lens and refocusing doublet lately and this also works as it should, but you get a sweet spot.
by Oak
Thu Aug 17, 2023 12:44 pm
Forum: Solar Scope Modifications
Topic: A Lumicon Lazarus
Replies: 30
Views: 2918

Re: A Lumicon Lazarus

here is scan progress i find very interesting before bake initlumscan.jpg after one hour oneHRlumscan.jpg after 12 hours hopefully it will work twlvHRlumscan.jpg Very interesting! And it looks like a 3x increase in transmission. I have an old Thousand Oaks prom filter that has also drifted red . I ...
by Oak
Thu Jul 27, 2023 8:16 pm
Forum: This is SolarChat !!
Topic: Test DSII LS40 + LS40 with AR150/F24 -> F48 - New pictures
Replies: 18
Views: 1606

Re: Test DSII LS40 + LS40 with AR150/F24 -> F48 - New pictures

Nice work. I tried the same over the weekend with a b1200 and circular polarizer between the etalons and the results weren't nearly as nice. I will give it another go.
by Oak
Wed Jul 26, 2023 11:42 am
Forum: Solar Scope Modifications
Topic: Quark + Lunt 40mm double stack at 102mm aperture
Replies: 23
Views: 6424

Re: Quark + Lunt 40mm double stack at 102mm aperture

Thanks. It does change focus, but very little. Less than 1cm. I have had two Lunt 40s behind the quark as a triple stack and there was still minimal focus shift.
by Oak
Thu Jul 13, 2023 1:03 am
Forum: Solar Scope Modifications
Topic: Quark + Lunt 40mm double stack at 102mm aperture
Replies: 23
Views: 6424

Re: Quark + Lunt 40mm double stack at 102mm aperture

Thanks. Glad it's working for you. Also very gratifying to see others trying this approach. That's a nice looking setup and image!
by Oak
Wed Jul 05, 2023 12:57 pm
Forum: Solar Scope Modifications
Topic: Quark + Lunt 40mm double stack at 102mm aperture
Replies: 23
Views: 6424

Re: Quark + Lunt 40mm double stack at 102mm aperture

Tuning/tilting does make a difference to me, but less than with single stack. (You are just trying to maximize brightness and evenness to match the two etalons) . Putting the air spaced Lunt etalon in the telecentric beam behind the quark does blue shift the etalon slightly, which takes the place of...
by Oak
Fri Jun 30, 2023 6:35 pm
Forum: Solar Scope Modifications
Topic: Quark Chromosphere DS Mod
Replies: 19
Views: 2178

Re: Quark Chromosphere DS Mod

So far i did a first run of the printed parts.. for now looks ok. Still need to do the threads for the m6 screws but the other threads have worked pretty much right away. Now waiting for the Lunt 40mm to arrive. I have a big concern though: How does the telecentric of the Quark behave with the newl...
by Oak
Tue Jun 20, 2023 5:11 pm
Forum: Solar Scope Modifications
Topic: Small Etalon Improvement For Only $15 USD (13 Euros)
Replies: 91
Views: 20502

Re: Small Etalon Improvement For Only $15 USD (13 Euros)

Briefly though wildfire haze but the results were very good. No more sweet band in double stack. Is your 40mm fairly uniform? I just got it today and had a brief time with a very stiff photo tripod. It looks pretty good from what I saw today. The full disk looked uniform on band. Looks like I’m in ...
by Oak
Tue Jun 20, 2023 12:40 am
Forum: Solar Scope Modifications
Topic: Small Etalon Improvement For Only $15 USD (13 Euros)
Replies: 91
Views: 20502

Re: Small Etalon Improvement For Only $15 USD (13 Euros)

Briefly though wildfire haze but the results were very good. No more sweet band in double stack. Is your 40mm fairly uniform?
by Oak
Mon Jun 19, 2023 9:31 pm
Forum: Solar Scope Modifications
Topic: Quark Chromosphere DS Mod
Replies: 19
Views: 2178

Re: Quark Chromosphere DS Mod

I think i will start out with printing the adapter in polylactide at work tmr. Anybody knows if there is a Quark thread to t2 adapter 3d file? Havent found one yet. Flo and agenda sell quark to t2 adapters. If the m6x1 threads in the etalon housing are giving you trouble, I would just get a tap and...
by Oak
Mon Jun 19, 2023 2:02 am
Forum: Solar Scope Modifications
Topic: Quark Chromosphere DS Mod
Replies: 19
Views: 2178

Re: Quark Chromosphere DS Mod

I've seen 6 or 7 people do it. I have done with two etalons and both work fine, one does seem to work a little better though. There is if course a bias to this in that if it's not working one is less likely to go online and post images. In a telecentric beam it's also working at a widened bandpass s...
by Oak
Sun Jun 18, 2023 8:59 pm
Forum: Solar Scope Modifications
Topic: Quark Chromosphere DS Mod
Replies: 19
Views: 2178

Re: Quark Chromosphere DS Mod

Com-pression. Basically DIY richview tuning. See below. You would need vacuum to tune a tilt tuned etalon with pressure.

viewtopic.php?p=388259#p388259
by Oak
Sun Jun 18, 2023 7:53 pm
Forum: Solar Scope Modifications
Topic: Quark Chromosphere DS Mod
Replies: 19
Views: 2178

Re: Quark Chromosphere DS Mod

No problem. I've tried with two Lunt 40mm etalons and both worked well. Still need flats though. I just added compression tuning to my 40mm etalons so they are on band without significant tilt. It definitely improves the image in my DS Lunt 40. Hoping that will improve their use in double stack with...
by Oak
Sun Jun 18, 2023 6:39 pm
Forum: Solar Scope Modifications
Topic: Quark Chromosphere DS Mod
Replies: 19
Views: 2178

Re: Quark Chromosphere DS Mod

Here is the relevant thread re the 40mm adapter. There is also an aluminum one available from Raf camera linked. If you have a suggestion of a better printable material vs nylon, that would be helpful.
-Derek

viewtopic.php?t=35857
by Oak
Fri Jun 16, 2023 2:36 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Got my RG-18 0.3 back!
Replies: 14
Views: 1583

Re: Got my RG-18 0.3 back!

I'm interested to hear how the RG 0.3 and the Lunt 40mm get along. I've thought about doing this but the wait time and cost are currently barriers. I would expect the Lunt 40 in a posterior position to be a bit brighter than the front mount. You can remove the redundant ERF in the Lunt 40 (just unsc...
by Oak
Sun Jun 04, 2023 7:06 pm
Forum: Solar Scope Modifications
Topic: Small Etalon Improvement For Only $15 USD (13 Euros)
Replies: 91
Views: 20502

Re: Small Etalon Improvement For Only $15 USD (13 Euros)

Here is another version for the Lunt 40mm. Try as I might, I could not find thrust bearings to fit the 40mm etalon. Instead, I ended up going with 2-3 PTFE washers 2mm in thickness, 55mm OD and 45mm ID, centered in the cover using 3 pieces of velcro tape - under $10 USD total cost. The idea is that ...
by Oak
Tue May 09, 2023 2:04 pm
Forum: Solar Scope Modifications
Topic: Help! Lunt: trying to get a diameter upgrade in full disc
Replies: 13
Views: 2737

Re: Help! Lunt: trying to get a diameter upgrade in full disc

Hi David, Just to be sure I understand properly the setup : you are using the TO 0.9 A filter as an additional filter (say "double-stack") after the Lunt filter ? If so, try to rotate the position of the 0.9 A TO (while keeping the Lunt and camera at the same position) and see if the non ...
by Oak
Sat May 06, 2023 12:19 am
Forum: Solar Reference Library
Topic: DIY binoviewer eye shade
Replies: 6
Views: 1289

Re: DIY binoviewer eye shade

Tried them on the sunoculars. A bit too deep to be super comfortable but they do work. The front and back cutouts need to be trimmed in 1-2 cm for binoculars. Very easy to put on and off.