Search found 512 matches

by Bob Yoesle
Thu Mar 14, 2019 11:11 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Help me decide on solar setup
Replies: 7
Views: 497

Re: Help me decide on solar setup

For narrow-band imaging (e.g. H alpha and CaK), the 102 f10 achromat will be superior to a shorter focal ratio ED refractor telescope due to generally better spherochromatic aberration performance. For white light continuum viewing/imaging, the chromatic aberration will not be too obtrusive, and can...
by Bob Yoesle
Sun Feb 24, 2019 8:29 pm
Forum: This is SolarChat !!
Topic: Saturday Sunshine - 23rd February
Replies: 15
Views: 268

Re: Saturday Sunshine - 23rd February

Hi Mark,

The DS w Quark/SM90 is amazingly good!

I'm also envious you have such good weather. We're not going to get much above freezing for another two to three weeks...

Driveway snow.jpg
Driveway snow.jpg (281.88 KiB) Viewed 194 times
by Bob Yoesle
Sun Feb 24, 2019 8:21 pm
Forum: This is SolarChat !!
Topic: CaK, 24022019, second try telecentric beam
Replies: 12
Views: 257

Re: CaK, 24022019, second try telecentric beam

Hi Bart,

Right now (when the sun comes out), I'll be using my Chameleon w 3.75 um pixels... may get something different in the future.
by Bob Yoesle
Sun Feb 24, 2019 8:17 pm
Forum: This is SolarChat !!
Topic: Weekend of fun in the sun with lots of new equipment
Replies: 16
Views: 329

Re: Weekend of fun in the sun with lots of new equipment

Very nice images Alexandra, especially H alpha!

I think we need to get Valery or Baader to address making a CaK spherical aberration corrector for the SCT, and the results will be even better!
SCT perfromance.jpg
SCT perfromance.jpg (179.89 KiB) Viewed 314 times
by Bob Yoesle
Sun Feb 24, 2019 7:41 pm
Forum: This is SolarChat !!
Topic: CaK, 23022019. Double plus triple.
Replies: 7
Views: 206

Re: CaK, 23022019. Double plus triple.

HI Bart,

Your results look similar to mine, and I can definitely see more detail at the limb with the triple stack.
by Bob Yoesle
Sun Feb 24, 2019 7:18 pm
Forum: This is SolarChat !!
Topic: CaK, 24022019, second try telecentric beam
Replies: 12
Views: 257

Re: CaK, 24022019, second try telecentric beam

Hi Bart - looks great! I'm anxious to press my TZ3/0.4 reducer into action when the Sun appears in a few months... Baader does specify the the focus will shift 5 mm for CaK with the TZ3: " Because they are made for H-apha-filters, they are designed for 656.3 nm (the red H-alpha-light); only the TZ3 ...
by Bob Yoesle
Sun Feb 24, 2019 6:53 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: New PST ITF?
Replies: 31
Views: 3620

Re: New PST ITF?

Hi M, I would not be too disregarding and suspicious - I doubt there are astronomy "cartels" trying to push more than you need when it comes to solar filters and safety. Indeed, my experience has been that the filter makers and suppliers have at times overestimated the blocking ability of their filt...
by Bob Yoesle
Tue Feb 19, 2019 9:53 pm
Forum: This is SolarChat !!
Topic: Our dear Richard Bailey
Replies: 12
Views: 306

Re: Our dear Richard Bailey

“We are like butterflies who flutter for a day and think it is forever.”
― Carl Sagan, Cosmos

After a long day in the warmth of the sun, we come home to rest at night in the cool of the earth.

Rest in peace Richard...

Sunset.jpg
Sunset.jpg (62.98 KiB) Viewed 286 times
by Bob Yoesle
Sun Feb 17, 2019 11:20 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: ERF and UV filter with 152mm f8 refractor and Quark
Replies: 7
Views: 605

Re: ERF and UV filter with 152mm f8 refractor and Quark

At 150 mm you really do need something beyond the 2 inch UV/IR type of filter... Go with Valery's Tri-band filter for the most versatility. If you only want H alpha, the Baader DERF would work as well. Avoid the simple red or yellow glass absorptive objective ERF's. See this recent Cloudy Nights pos...
by Bob Yoesle
Sun Feb 17, 2019 10:03 pm
Forum: This is SolarChat !!
Topic: CaK, 16022019. SolarMonitor plus experiments
Replies: 17
Views: 352

Re: CaK, 16022019. SolarMonitor plus experiments

Thanks Bart, nice to see in the comparisons!
by Bob Yoesle
Sun Feb 17, 2019 9:59 pm
Forum: Solar Scope Modifications
Topic: Beloptik ha system
Replies: 3
Views: 250

Re: Beloptik ha system

"Personally, no. Lots of people on here have tried the telecentric / air spaced etalon route and it yields results with too wide a bandpass." I would expect that, since 0.7 angstrom air spaced etaons were originally intended for use on the front objective, where the 0.25 degree field angle of the Su...
by Bob Yoesle
Sun Feb 17, 2019 4:08 pm
Forum: This is SolarChat !!
Topic: CaK, 16022019. SolarMonitor plus experiments
Replies: 17
Views: 352

Re: CaK, 16022019. SolarMonitor plus experiments

Thanks for the trials you gone through Bart! Could you post or PM me the image trials of the filter combinations? Just curious to see all the results for the comparison...
by Bob Yoesle
Wed Feb 13, 2019 8:54 pm
Forum: Solar Scope Modifications
Topic: PST Etalon with a Quark, Log & Results
Replies: 112
Views: 4680

Re: PST Etalon with a Quark, Log & Results

Hi Marty, In some of your most recent images I'm seeing just a hint of the double limb, which is not obtrusive. In others I'm seeing processing artifacts, not the double limb of the photosphere: M Wise highlight.jpg Note the irregular hard edge appearance all along the limb and at the indicated loca...
by Bob Yoesle
Tue Feb 05, 2019 3:56 pm
Forum: This is SolarChat !!
Topic: New Year, New Setup & the Blocking Filter Experiment - 3rd February
Replies: 22
Views: 590

Re: New Year, New Setup & the Blocking Filter Experiment - 3rd February

"I think as we become more seasoned and experienced solar observers our expectations in terms of how even the illumination of our filters are gets higher. I think back to some of my earlier setups and the illumination of the etalons and while I was happy then I wouldn't accept it now." Hope the new ...
by Bob Yoesle
Mon Feb 04, 2019 3:03 pm
Forum: This is SolarChat !!
Topic: CaK, 03022019
Replies: 17
Views: 415

Re: CaK, 03022019

Hi Bart, Wonderful images! The Baader 0.4 reducer is the "research grade" to mate with the TZ3 and restores the original f ratio / EFL of the system. Haven't had a chance to use it yet but looking forward to when the weather improves. Looks indeed like we're on the same path... The Chroma Tech CaK f...
by Bob Yoesle
Sun Feb 03, 2019 8:25 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Available external DS etalons??
Replies: 25
Views: 881

Re: Available external DS etalons??

ED 80 might be better for the CaK, but hard to say w/o having accurate data.

You set up sounds like it will be ideal. Two thumbs up!
by Bob Yoesle
Sun Feb 03, 2019 8:14 pm
Forum: This is SolarChat !!
Topic: New Year, New Setup & the Blocking Filter Experiment - 3rd February
Replies: 22
Views: 590

Re: New Year, New Setup & the Blocking Filter Experiment - 3rd February

Awesome and beautiful scope Mark, and the contrast uniformity looks great. I'm assuming it uses an internal 60 mm filter for minimum field angle magnification. It sounds like the front etalon you tried was a dedicated DS filter, and apparently required excessive tilt. I experienced this with a 60 mm...
by Bob Yoesle
Sun Feb 03, 2019 6:09 pm
Forum: This is SolarChat !!
Topic: Lunt Stopping Making CaK Modules?
Replies: 14
Views: 409

Re: Lunt Stopping Making CaK Modules?

Production cost and demand realities are what they are.

But I don't think CaK will become a unicorn, dino-dodo, etc. It seems DayStar has (and perhaps SolarSpectrum as a custom order) and will likely keep the CaK option available in the mica based etalons.
by Bob Yoesle
Tue Jan 29, 2019 5:25 pm
Forum: Solar Scope Modifications
Topic: PST Etalon with a Quark, Log & Results
Replies: 112
Views: 4680

Re: PST Etalon with a Quark, Log & Results

Now you're cooking Marty! Pretty much right on band to me. The normally processed greyscale bright and dark mottles look exactly as they should, and there is no discernable double limb.
by Bob Yoesle
Fri Jan 25, 2019 4:32 pm
Forum: Solar Scope Modifications
Topic: Lunt CaK diagonal modded to straight through
Replies: 7
Views: 382

Re: Lunt CaK diagonal modded to straight through

Thanks guys, I guess I'll give a little more time for a response, and then try again. Mark, it sure looks like a Baader T2 device, but I looked at their site and didn't find this particular implementation. So I'm hoping to hear back from Astrograph... Seems like it would be ideal for a modular syste...
by Bob Yoesle
Fri Jan 25, 2019 5:15 am
Forum: Solar Scope Modifications
Topic: Lunt CaK diagonal modded to straight through
Replies: 7
Views: 382

Re: Lunt CaK diagonal modded to straight through

Very cool Bart. I'm looking at a total redesign of my CaK module, but hitting a roadblock with filter mounting implementation with some ability to tilt multiple individual filters fairly close together. I found this nifty tilt adapter which seems like it would be perfect, but it says "not in stock,"...
by Bob Yoesle
Thu Jan 24, 2019 12:30 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: What camera?
Replies: 23
Views: 1086

Re: What camera?

I have been struggling to get my 2 point grey cameras to work with Firecapture recently and so I don't fancy another to add to the pile... I recently had the same problem with my PGR Chameleon, downloading the latest SDK fixed this - it might get your current two PGR cameras working again. BTW thei...
by Bob Yoesle
Wed Jan 23, 2019 2:07 pm
Forum: Solar Scope Modifications
Topic: PST Etalon with a Quark, Log & Results
Replies: 112
Views: 4680

Re: PST Etalon with a Quark, Log & Results

Thanks Mark - I was lucky to be able to get these etalons when such quality was available and still relatively affordable. I should note that the above images were wavelet processed in RegiStax6, but had no additional post processing, and the their RG630 ERF's were replaced by a single Baader DERF f...
by Bob Yoesle
Tue Jan 22, 2019 11:36 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: What camera?
Replies: 23
Views: 1086

Re: What camera?

... you can get this chip in ZWO, PGR and Basler versions, does it make any difference? Just an FYI, A couple of years ago I fried my Point Grey Chameleon's sensor when the Baader film filter I made intermittently partially blew off in the wind. Point Grey replaced the entire camera for a standard ...