Search found 3252 matches

by Merlin66
Sat Jan 19, 2019 3:05 pm
Forum: This is SolarChat !!
Topic: Jan 18-19, 2019 Prominences
Replies: 10
Views: 328

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: 441

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: 441

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 441 times
Sun_104521_PSP.jpg
Sun_104521_PSP.jpg (300.23 KiB) Viewed 441 times
104258_limb.jpg
104258_limb.jpg (71.94 KiB) Viewed 441 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: 2283

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: 27
Views: 1508

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: 790

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: 790

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: 1019

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: 25
Views: 1043

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: 25
Views: 1043

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: 25
Views: 1253

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: 25
Views: 1253

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: 25
Views: 1253

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: 25
Views: 1253

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 1039 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: 25
Views: 1253

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 1043 times
PST_tuning ring screw removed.jpg
PST_tuning ring screw removed.jpg (265.51 KiB) Viewed 1043 times
PST_tuning ring removed_Orings.jpg
PST_tuning ring removed_Orings.jpg (278.83 KiB) Viewed 1043 times
Hope this helps...
by Merlin66
Fri Jan 04, 2019 2:00 am
Forum: Solar Scope Modifications
Topic: PST Etalon Adjustment
Replies: 25
Views: 1253

Re: PST Etalon Adjustment

Brian,
Hmmm - were the O ring grooves visible....may be no O rings there!!!!
by Merlin66
Fri Jan 04, 2019 12:59 am
Forum: Solar Scope Modifications
Topic: PST Etalon Adjustment
Replies: 25
Views: 1253

Re: PST Etalon Adjustment

Brian, -Remove the rubber knurled ring -Look for the small Philips head screw in the outer ring -Remove the screw -Slide the outer ring off the housing -Look at the outer surface of the housing - you'll see the two O rings NB make a note of the hole that the screw was sitting in (on the inner ring v...
by Merlin66
Thu Jan 03, 2019 10:07 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Altair Hypercam 183M Mono CMOS Camera with ROI
Replies: 14
Views: 1845

Re: Altair Hypercam 183M Mono CMOS Camera with ROI

Brian,
Flats on the ASI 183 didn’t work for me.....
I have no issues with the ASI 1600MM....
by Merlin66
Thu Jan 03, 2019 5:50 am
Forum: Solar Scope Modifications
Topic: PST Etalon with a Quark, Log & Results
Replies: 112
Views: 5357

Re: PST Etalon with a Quark, Log & Results

Marty,
Another factor would be the amount of off band; the further from the Ha CWL the more likely the chance to pick up the Continuum......
by Merlin66
Wed Jan 02, 2019 9:51 pm
Forum: Solar Scope Modifications
Topic: PST Etalon with a Quark, Log & Results
Replies: 112
Views: 5357

Re: PST Etalon with a Quark, Log & Results

Marty,
Yeah, you're probably correct....better seeing and better focus might show it more clearly....
Onwards and Upwards.
by Merlin66
Wed Jan 02, 2019 9:23 pm
Forum: Solar Scope Modifications
Topic: PST Etalon with a Quark, Log & Results
Replies: 112
Views: 5357

Re: PST Etalon with a Quark, Log & Results

I occasionally have the PST etalon assembly double stacked on the SM60/ED80 (which gives an f10 beam) and BF15.. The image below was taken on 31 Dec 2018 using an ES x3 extender (for the first time) and the ASI 174 (excuse the NR - forgot to add the T2 tilter!) I'd like to think that this combo effe...
by Merlin66
Wed Jan 02, 2019 4:47 am
Forum: Solar Scope Modifications
Topic: PST Etalon with a Quark, Log & Results
Replies: 112
Views: 5357

Re: PST Etalon with a Quark, Log & Results

George,
Fair comment.
It would depend how how “matched” the transmission curves are and how close they are in CWL.
by Merlin66
Wed Jan 02, 2019 12:46 am
Forum: Solar Scope Modifications
Topic: Calcium K blocking filter
Replies: 17
Views: 1046

Re: Calcium K blocking filter

George,
To get the Baader blue filter as far as possible up the OTA I bought a series of M48 adaptor rings, 50,30,10mm and used them to push the Baader forward.
by Merlin66
Wed Jan 02, 2019 12:40 am
Forum: Solar Scope Modifications
Topic: PST Etalon with a Quark, Log & Results
Replies: 112
Views: 5357

Re: PST Etalon with a Quark, Log & Results

The PST etalon assembly is designed to accept an f10 input beam and when positioned at the correct -200mm presents a collimated beam to the etalon. One issue, which would impact on the performance would be the blocking filter bandwidth in the Quark. I recently tested a PST blocker and it was close t...
by Merlin66
Tue Jan 01, 2019 11:49 pm
Forum: Solar Scope Modifications
Topic: PST Etalon with a Quark, Log & Results
Replies: 112
Views: 5357

Re: PST Etalon with a Quark, Log & Results

Marty,
Yeah, that looks good for a PST.....