Search found 3212 matches

by Merlin66
Wed Jan 23, 2019 2:52 am
Forum: Solar Scope Modifications
Topic: Adapter for doublestacking PST etalons
Replies: 6
Views: 127

Re: Adapter for doublestacking PST etalons

Bart,
I have a set of the Neumann filter drawers. Could use a standard 1.25” CPL filter.
Just needs a couple of T thread to M50 Adaptors?
by Merlin66
Tue Jan 22, 2019 11:10 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: What camera?
Replies: 11
Views: 111

Re: What camera?

Mark,
The ZWO T2 tilter has a built-in light foam seal which stops any light leakage through the tilt gap. No need for gaffa tape etc.
by Merlin66
Tue Jan 22, 2019 12:52 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: What camera?
Replies: 11
Views: 111

Re: What camera?

Alexandra,
With the tilter...when it's installed just takes a minute or so to set it - no NR!
Never have to adjust it again, just leave it in place on the camera.
by Merlin66
Mon Jan 21, 2019 9:13 pm
Forum: Solar Scope Modifications
Topic: PST Etalon Adjustment
Replies: 21
Views: 507

Re: PST Etalon Adjustment

Snug firm and tight....
(I'll enclose a couple of the O rings in your "package" ;) )
by Merlin66
Mon Jan 21, 2019 8:13 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: What camera?
Replies: 11
Views: 111

Re: What camera?

Alexandra,
I use the ASI 174mm on my PST mod, SM60/ED80 and the Spectroheliograph. The camera is always used with a T2 tilter as 99% of the time there are NR generated.
by Merlin66
Mon Jan 21, 2019 8:04 pm
Forum: Solar Scope Modifications
Topic: PST Etalon Adjustment
Replies: 21
Views: 507

Re: PST Etalon Adjustment

Bart,
If the knurled rubber tuning ring feels "loose", then there's a good chance that the O rings have flattened over time and the replacement would help make it feel firmer.
by Merlin66
Mon Jan 21, 2019 4:47 am
Forum: Solar Scope Modifications
Topic: PST Etalon Adjustment
Replies: 21
Views: 507

Re: PST Etalon Adjustment

Just an update....
The new O rings arrived.
They fit perfectly!
110% improvement in the tuning ring "stability".
I have some spares, drop me an email if you need a set.
Ken
by Merlin66
Sun Jan 20, 2019 3:30 am
Forum: This is SolarChat !!
Topic: Solar proms, surface and edge in Ha 119 Jan 2019
Replies: 13
Views: 103

Re: Solar proms, surface and edge in Ha 119 Jan 2019

Thanks!!
I'm revisiting ImPPG for the processing, it looks very promising......
by Merlin66
Sat Jan 19, 2019 11:48 pm
Forum: Solar Scope Modifications
Topic: PST Etalon with a Quark, Log & Results
Replies: 77
Views: 1903

Re: PST Etalon with a Quark, Log & Results

Here's the above DS jpg file in a quick (not perfect!!) run through ImPPG.
Marty_Quark_PST_DS_01_imppg.jpg
Marty_Quark_PST_DS_01_imppg.jpg (141.73 KiB) Viewed 58 times
by Merlin66
Sat Jan 19, 2019 11:38 pm
Forum: Solar Scope Modifications
Topic: PST Etalon with a Quark, Log & Results
Replies: 77
Views: 1903

Re: PST Etalon with a Quark, Log & Results

Marty, I've started to play "seriously" with imppg to hopefully improve my processing skills. One thing I do notice is that depending on the processing I can "pull" the double edge out of almost any image.... As per my previous early comments I think CWL on Ha is a clear winner to reduce the double ...
by Merlin66
Sat Jan 19, 2019 3:05 pm
Forum: This is SolarChat !!
Topic: Jan 18-19, 2019 Prominences
Replies: 10
Views: 63

Re: Jan 18-19, 2019 Prominences

Mike,
Very good results, well done.
What's the set up you're using??
by Merlin66
Sat Jan 19, 2019 3:00 pm
Forum: This is SolarChat !!
Topic: Solar proms, surface and edge in Ha 119 Jan 2019
Replies: 13
Views: 103

Re: Solar proms, surface and edge in Ha 119 Jan 2019

Thanks!
The seeing conditions down here on the Bay limit hi-res work, but the SM60 DS with the PST etalon does seem to be a step forward.
by Merlin66
Sat Jan 19, 2019 5:33 am
Forum: This is SolarChat !!
Topic: Solar proms, surface and edge in Ha 119 Jan 2019
Replies: 13
Views: 103

Solar proms, surface and edge in Ha 119 Jan 2019

Trying the SM60/ED80 with the PST mod plus ASI 174 , x2.5PM and tilter.
The double edge seems to be removed(?)
Need more tweaking, but definitely looking promising.
Onwards and Upwards.
Sun_103858_cor.jpg
Sun_103858_cor.jpg (32.27 KiB) Viewed 103 times
Sun_104521_PSP.jpg
Sun_104521_PSP.jpg (300.23 KiB) Viewed 103 times
104258_limb.jpg
104258_limb.jpg (71.94 KiB) Viewed 103 times
by Merlin66
Fri Jan 18, 2019 3:14 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: ZWO ASI 178 or 183 mono
Replies: 14
Views: 1787

Re: ZWO ASI 178 or 183 mono

Brian,
I assume you mean the ASI 174?
I've used it successfully at all wavelengths (CaH to Ha) but needed the tilter to suppress NR.

If you mean the ASI 183 - should be OK in white light but I think, based on the known issues, would suffer in CaK narrowband.
by Merlin66
Thu Jan 17, 2019 12:10 am
Forum: This is SolarChat !!
Topic: Old Coronado BF30
Replies: 22
Views: 913

Re: Old Coronado BF30

Could it be a standard filter thread??
May be a M50 x 0.75???
by Merlin66
Tue Jan 15, 2019 10:43 pm
Forum: This is SolarChat !!
Topic: 17092017-AR2680 and western limb
Replies: 12
Views: 580

Re: 17092017-AR2680 and western limb

Bart,
I said back in 2009, that the PST DS was a pain in the butt to tune, so much so I gave up.....
Following your success and finding more rusty pins to stick in my eye (!!) I'm going to revisit this option.
Certainly an interesting option.....
by Merlin66
Mon Jan 14, 2019 9:02 pm
Forum: This is SolarChat !!
Topic: 17092017-AR2680 and western limb
Replies: 12
Views: 580

Re: 17092017-AR2680 and western limb

Bart,
Just re-visiting the PST DS thread.....
Any updates on your set-up???
by Merlin66
Mon Jan 07, 2019 9:19 pm
Forum: Solar Astronomy Shop and Swap
Topic: Wanted: SM60 external etalon
Replies: 2
Views: 894

Re: Wanted: SM60 external etalon

I'm still looking for a Coronado SME60 with Tmax.
Can you help?????
Let me know.
Ken
by Merlin66
Mon Jan 07, 2019 9:17 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Available external DS etalons??
Replies: 6
Views: 305

Re: Available external DS etalons??

Pedro, Interesting comment..... I recently tested a defective SME90 and had major "issues" with the Richview tuning....it ended up going back to Meade (from Australia) twice before effectively being repaired. I tend to agree, the original Coronado DS filter (I use one on my ED80 set-up) is very good...
by Merlin66
Sat Jan 05, 2019 11:11 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Available external DS etalons??
Replies: 6
Views: 305

Available external DS etalons??

I can't seem to find any Meade/ Coronado external etalons in the US...
The SME-40, SME-60 and SME-90 are still listed in the UK
http://www.meadeuk.com/Coronado-Etalon-Units.html

Lunt do a 50mm/60mm and 100mm
Is that correct???
by Merlin66
Sat Jan 05, 2019 11:06 pm
Forum: Solar Scope Modifications
Topic: PST Etalon Adjustment
Replies: 21
Views: 507

Re: PST Etalon Adjustment

Hmmm
Another cost saving exercise?????
by Merlin66
Sat Jan 05, 2019 5:13 am
Forum: Solar Scope Modifications
Topic: PST Etalon Adjustment
Replies: 21
Views: 507

Re: PST Etalon Adjustment

Brian,
That's part of the concern....
I've ordered a pack of the replacement O rings - when they arrive I'll confirm fitment and offer them to any members in need.
by Merlin66
Sat Jan 05, 2019 2:16 am
Forum: Solar Scope Modifications
Topic: PST Etalon Adjustment
Replies: 21
Views: 507

Re: PST Etalon Adjustment

Brian,
I’ve just be advised that the newer PST (< five year old(?) with anodized aluminum gold tube) don’t appear to have these Orings...never stripped one so don’t know how they maintain the outer tuning ring.

Can anyone confirm this, photos?......
by Merlin66
Fri Jan 04, 2019 4:32 am
Forum: Solar Scope Modifications
Topic: PST Etalon Adjustment
Replies: 21
Views: 507

Re: PST Etalon Adjustment

Brian,
Just removed and measured the O rings...
They appear to be 47mm inside diameter x 1.7 diameter.
The retaining grooves seem to be 1.8mm wide x 1.45mm deep.

Hope this helps.
PST_Orings removed.JPG
PST_Orings removed.JPG (289.5 KiB) Viewed 371 times
[Edit] The nearest standard size seems to be 47.35mm inside x 1.78mm diameter.
by Merlin66
Fri Jan 04, 2019 3:27 am
Forum: Solar Scope Modifications
Topic: PST Etalon Adjustment
Replies: 21
Views: 507

Re: PST Etalon Adjustment

Brian,
Some images of the PST, rubber ring removed, tuning ring removed, O rings visible....
PST_rubber removed.JPG
PST_rubber removed.JPG (95.2 KiB) Viewed 375 times
PST_tuning ring screw removed.jpg
PST_tuning ring screw removed.jpg (265.51 KiB) Viewed 375 times
PST_tuning ring removed_Orings.jpg
PST_tuning ring removed_Orings.jpg (278.83 KiB) Viewed 375 times
Hope this helps...