Search found 418 matches

by Bob Yoesle
Mon Aug 20, 2018 6:36 pm
Forum: Solar Scope Modifications
Topic: Details of a telecentric lens for C8 Edge and Daystar filter
Replies: 6
Views: 494

Re: Details of a telecentric lens for C8 Edge and Daystar filter

HI Peter, Thanks for your excellent work on this :-) I have a favor to ask you - any chance you could work up a similar corrector for the original (non-HD) C8? I'm also considering modifying an original (non-HD) C8 with a re-spaced corrector ( https://www.cloudynights.com/topic/441781-respaced-corre...
by Bob Yoesle
Wed May 23, 2018 1:44 pm
Forum: Solar Scope Modifications
Topic: PST CaK mod
Replies: 22
Views: 1628

Re: PST CaK mod

Yes, it did have that (deteriorated) shinny gold filter as well, which shows as a blue substrate and ITF-like deterioration from the edge inward when held just right: Rusted CaK filter.jpg No 2 PST CaK filter.jpg My convention for the filter names is that the 1st filter after the objective is called...
by Bob Yoesle
Wed May 23, 2018 1:27 pm
Forum: This is SolarChat !!
Topic: Replacing the Rusted BF30 Filter
Replies: 54
Views: 2307

Re: Replacing the Rusted BF30 Filter

Thank you very much Mark for your input and expertise ;-)
by Bob Yoesle
Wed May 23, 2018 1:08 pm
Forum: This is SolarChat !!
Topic: Thermal Acclimation of My Lunt50
Replies: 33
Views: 1789

Re: Thermal Acclimation of My Lunt50

Looks to have great contrast when stabilized Mark. excellent imaging BTW!
by Bob Yoesle
Fri May 18, 2018 7:27 pm
Forum: Solar Scope Modifications
Topic: PST CaK mod
Replies: 22
Views: 1628

Re: PST CaK mod

Bob, what 2" filter adapters did you use? The CaK pst filter is not 2" and does not seem like it would be a drop in option? Can you provide links to the actual products used that hold your dismantled PST parts I also notice in the picture you do not mention the pst #2 filter which is blue coated on...
by Bob Yoesle
Fri May 18, 2018 6:24 pm
Forum: This is SolarChat !!
Topic: Replacing the Rusted BF30 Filter
Replies: 54
Views: 2307

Re: Replacing the Rusted BF30 Filter

I went with the BelOptik UV/IR KG3 as my BF30 ITF replacement, and couldn't be happier: https://solarchatforum.com/viewtopic.php?f=9&t=14783 Oliver can turn it down to 34 mm in diameter as he did for me so it is a drop-in replacement. As long as you have another RG630 element in the filter stew,such...
by Bob Yoesle
Fri May 04, 2018 3:06 am
Forum: This is SolarChat !!
Topic: Not very good news about Solar Minimum
Replies: 8
Views: 639

Re: Not very good news about Solar Minimum

Hi Rainer, Thanks and looking and reading this one could ask, Where is global warming made by humans ? Unfortunately, global warming will be here to stay no matter what the sun does: https://www.skepticalscience.com/mini-ice-age-myth-still-wrong.html https://www.washingtonpost.com/news/energy-enviro...
by Bob Yoesle
Thu May 03, 2018 2:41 pm
Forum: This is SolarChat !!
Topic: Not very good news about Solar Minimum
Replies: 8
Views: 639

Re: Not very good news about Solar Minimum

This is nothing new, and has been in the science media for many years: http://www.skyandtelescope.com/astronomy-news/the-weakest-solar-cycle-in-100-years/ It is also opening some interesting science theories about our star, and as Mr. Spock would say... "fascinating." https://www.ras.org.uk/news-and...
by Bob Yoesle
Tue May 01, 2018 1:36 pm
Forum: This is SolarChat !!
Topic: Thermal Acclimation of My Lunt50
Replies: 33
Views: 1789

Re: Thermal Acclimation of My Lunt50

Sounds very familiar to the issues I had with the DSF100 SolarScope filters Mark. They sometimes would present a completely off-band continuum view, and could take up to an hour or more to get to showing a half way decent on-band view. They worked well after reaching thermal equilibrium, but they we...
by Bob Yoesle
Tue May 01, 2018 1:21 pm
Forum: Solar Scope Modifications
Topic: PST CaK mod
Replies: 22
Views: 1628

Re: PST CaK mod

Forget using the PST body and make a completely new CaK "module" using some relatively easy to obtain 2" inch adapters. You'll need a Baader or Astronmomic Blue CCD filter for use as an ERF, and the Baader CaK filter makes a good blocking filter for the "no. 1" narrow-band component of the PST: CaK ...
by Bob Yoesle
Wed Apr 18, 2018 6:02 pm
Forum: This is SolarChat !!
Topic: Flat black
Replies: 14
Views: 804

Re: Flat black

Hi Bart,

Thank you very much for your offer.

Apparently the paint contains materials deemed hazardous for international shipping: "Attention !!! Can not be shipped by air due to security restrictions!"
by Bob Yoesle
Tue Apr 17, 2018 4:10 pm
Forum: This is SolarChat !!
Topic: Flat black
Replies: 14
Views: 804

Re: Flat black

I have received word that the Berger Astrogate anti-reflection paint cannot be shipped to the USA from either of the two sources above :-(
by Bob Yoesle
Mon Apr 16, 2018 1:17 pm
Forum: Solar Scope Modifications
Topic: Looking for guidance in double-stacking an SM90 from inside a TV102i
Replies: 4
Views: 547

Re: Looking for guidance in double-stacking an SM90 from inside a TV102i

Hi Daniel, Yes, this can be done, and you will find lots of examples here and elsewhere on the internet by googling "PST mod." The PST "Stage 1" mod involves using the PST etalon with its collimating and refocusing lenses attached to the "PST box." You basically are removing the PST's gold tube with...
by Bob Yoesle
Sun Apr 15, 2018 4:08 pm
Forum: This is SolarChat !!
Topic: Flat black
Replies: 14
Views: 804

Re: Flat black

Here's a link to the Krylon Ultra Flat Black on USA Amazon - don't know about European sources:

https://www.amazon.com/Ultra-Flat-Black ... B0064OW9DW

Not too expensive...
by Bob Yoesle
Sun Apr 15, 2018 5:40 am
Forum: Solar Scope Modifications
Topic: Looking for guidance in double-stacking an SM90 from inside a TV102i
Replies: 4
Views: 547

Re: Looking for guidance in double-stacking an SM90 from inside a TV102i

Hi Daniel, Your best solution is to double stack with a second 90 mm front etalon. Adding an internal etalon will require optimizing a set of collimating/refcusing lenses - a negative elelment directly in front of the etalon, and a positive element behind the etalon. The larger the internal etalon, ...
by Bob Yoesle
Sat Apr 14, 2018 1:10 pm
Forum: This is SolarChat !!
Topic: Flat black
Replies: 14
Views: 804

Re: Flat black

Hi Stu, Looked the Black 2.0 up here in the States on Amazon, however, it gets quite a few mediocre reviews: https://www.amazon.com/BLACK-2-0-mattest-flattest-material/dp/B0758GKKGZ The Berger Astrogerate Bart suggested is a bit more expensive. It's available from Telescope Express in Germany in 250...
by Bob Yoesle
Thu Apr 12, 2018 1:41 pm
Forum: Solar Scope Modifications
Topic: KG3 IR Absorption vs IR Blocking filters? Same?
Replies: 82
Views: 3598

Re: KG3 IR Absorption vs IR Blocking filters? Same?

Remember that at 393 nm that 100 mm aperture is equivalent to about 166 mm of aperture at 656 nm. You can also go larger with more sophisticated ERF/blocking filter implementations.

viewtopic.php?t=16455
by Bob Yoesle
Thu Apr 12, 2018 1:35 pm
Forum: This is SolarChat !!
Topic: Lunt LS230???
Replies: 11
Views: 780

Re: Lunt LS230???

It's a wonderful thing to fantasize about, but suspect that it would be only the starting point of a list of expensive additions, beginning with a dedicated, permanent mount. What other accessories are need for a scope of that size? What innate problems come with a larger sized instrument like this...
by Bob Yoesle
Sun Mar 11, 2018 4:09 am
Forum: Solar Scope Modifications
Topic: C11 ERF-Concept
Replies: 12
Views: 913

Re: C11 ERF-Concept

Agree Mark, the cellophane is a non-starter. If I were going to do this (and that's a big IF considering the diffraction effects), I'd use Baader 35 nm nighttime H alpha filters. Better than the UV/IR for the UV/IR and visible blocking, on an RG substrate (RG610 I believe) and optically polished to ...
by Bob Yoesle
Sat Feb 03, 2018 3:12 pm
Forum: Solar Scope Modifications
Topic: Request advice on double stacking a new Meade SM90 to Coronado SM90
Replies: 16
Views: 1676

Re: Request advice on double stacking a new Meade SM90 to Coronado SM90

Hi Carl, I did a similar mod with my 2003/2004 SM 90's awhile back, and removed both RG630 ERF's, and placed a Baader DERF110 on the front DS etalon, and had a quite noticeable improvement in brightness. However, I replaced a rusted BF30 ITF with the BelOptik UV/IR cut on KG3, which required the re-...
by Bob Yoesle
Fri Feb 02, 2018 4:40 am
Forum: This is SolarChat !!
Topic: ETALONS & BFs
Replies: 23
Views: 1059

Re: ETALONS & BFs

Valery, I didn't quite believe or understand the tuning via compression of the etalon spacers myself, so I understand your skepticism. It wasn't until dealing directly with the tuning of my internal SM90 via compression forces, and then reading the patent and seeing that this was done for the early ...
by Bob Yoesle
Thu Feb 01, 2018 4:05 am
Forum: This is SolarChat !!
Topic: ETALONS & BFs
Replies: 23
Views: 1059

Re: ETALONS & BFs

While the PST's "RichView" tuning may indeed be only tilt tuning (I haven't used one in a very long time) -- and Meade may be using the term generically for marketing purposes -- true RichView tuning does appear to involve compression forces applied at the peripheral and central spacers. Moreover, I...
by Bob Yoesle
Wed Jan 31, 2018 3:00 pm
Forum: This is SolarChat !!
Topic: ETALONS & BFs
Replies: 23
Views: 1059

Re: ETALONS & BFs

Thanks for posting these Pedro! Your picture of the SM90II has answered a question I have had about the SMII front etalon with RichView tuning -- does it have mechanical pressure applied to the central spacer (in addtiton to the peripheral spacers)? The internal etalon's have a bolt secured to the n...
by Bob Yoesle
Fri Jan 26, 2018 9:29 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: H-alpha Zeiss APQ 130
Replies: 26
Views: 2526

Re: H-alpha Zeiss APQ 130

Yes, I believe the 12 nm will block IR out to about 1200 nm or so, making it similar to the other nighttime H alpha filters, and the UV/IR filters and ERF's. Only the BelOptick filter or their ITF replacement filter will block out to ~ 4000 nm or more, as it is specifically uses KG3 filter glass for...
by Bob Yoesle
Sun Jan 21, 2018 7:41 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Coronado Solarmax III
Replies: 6
Views: 1147

Re: Coronado Solarmax III

Mark's linked CN article makes it look promising. The SMIII seems to have better mechanicals (including a better focuser), and a nicer finish. Another poster received one in November and seems quite pleased. Sorry to say I'm not a convert to the Rich View Tuning, still prefer the original tilt/ T ma...