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Pages: 1 sullij1 Pooh-Bah Reged: 11/08/08 CalK Homebrew From Last Sunday       #5357426 - 08/08/12 12:30 AM Edit   Reply   Quote Quick Reply   Done on the AT65 with Baader photographic, QHY5/SSAG and my homebrew CalK 42 purple by Sullij1, on Flickr Post Extras:       frolinmod Pooh-Bah Reged: 08/06/10 Re: CalK Homebrew From Last Sunday [Re: sullij1]       #5357510 - 08/08/12 02:51 AM Edit   Reply   Quote Quick Reply   Wow, that's good! Post Extras:       Peter Molnar member Reged: 01/23/08 Loc: Budapest, Hungary Re: CalK Homebrew From Last Sunday [Re: frolinmod]       #5357556 - 08/08/12 04:33 AM Edit   Reply   Quote Quick Reply   Hi, great picture! Can we get some more info on this homebrew CaK filter? Thanks Peter Post Extras:       raylal Pooh-Bah Reged: 04/19/10 Loc: Cornwall, Ont., Canada Re: CalK Homebrew From Last Sunday [Re: Peter Molnar]       #5357597 - 08/08/12 06:51 AM Edit   Reply   Quote Quick Reply   Very interesting, huge spots. Ray Post Extras:       sullij1 Pooh-Bah Reged: 11/08/08 Re: CalK Homebrew From Last Sunday [Re: Peter Molnar]       #5357820 - 08/08/12 10:59 AM Edit   Reply   Quote Quick Reply   Quote: Hi, great picture! Can we get some more info on this homebrew CaK filter? Thanks Peter Thanks everyone. Been working with others searching for a homebrew that is decent for a while. This one is ok. Peter I am a work but will post more on the combo when I get home and try and add the links to the filters. This is a stack of 3 different inexpesive filters to reach a bandpass close to the required Calk bandpass. This one is still wide in the violet wing at ~3-4nm FWHM. Stilll much better than the Baader version at 10nm FWHM. Edited by sullij1 (08/08/12 11:00 AM) Post Extras:       Awesomelenny Post Laureate Reged: 05/02/04 Loc: Long: 81.42 W Lat: 41.21 N Re: CalK Homebrew From Last Sunday [Re: sullij1]       #5357910 - 08/08/12 11:57 AM Edit   Reply   Quote Quick Reply   Now you did it! Now I GOTTA know just how you did this. come on, share with us! What filters did you combine for this superb shot? Post Extras:       Peter Molnar member Reged: 01/23/08 Loc: Budapest, Hungary Re: CalK Homebrew From Last Sunday [Re: Awesomelenny]       #5358421 - 08/08/12 04:51 PM Edit   Reply   Quote Quick Reply   Thanks, I'm waiting for the info. I was also experimenting with combining filters: found that an UV/IR cut + UHC-S + visual red (all from Baader) performs like a ~40nm wide H-alpha filter (will try on some nebulae with my mono cam). Post Extras:       Jesus Munoz sage Reged: 03/09/07 Loc: Querétaro, México Re: CalK Homebrew From Last Sunday [Re: Peter Molnar]       #5358739 - 08/08/12 08:17 PM Edit   Reply   Quote Quick Reply   Very interesting result! I'll be following your topic. Post Extras:       sullij1 Pooh-Bah Reged: 11/08/08 Re: CalK Homebrew From Last Sunday [Re: Jesus Munoz]       #5358908 - 08/08/12 10:25 PM Edit   Reply   Quote Quick Reply   Here is the 411 on the filters. They are all sourced from Ebays Omega filters. You want 25mm rounds for best results. Looks like many of these got bought up. You can ask on the web site about availability. They will accommodate you if they can. The filter closest to the camera is a 410BP10 at 18 USD. No longer available on the site, you can ask. Next filter moving toward objective is a 395DF10 34.50 USD. No longer available on the site, you can ask. First toward objective is the 390ALP at 24.50 USD. Still available here: http://www.ebay.com/itm/Optical-Interference-Filter-390ALP-25mm-Barrier-UVB-Bl-/310324057290?pt=LH_DefaultDomain_0&hash=item4840c154ca This was a 77 USD total. This got the bandpass cut down to ~4nm CalK. This does not include parts to build an axial tilter. One can be constructed of copper plumbing tubing or Agena Blue fireball spacers (which I used + copper tubing). Probably another 30-50 dollars. Soo 107 – 127 USD complete. The filters have to be tilted against each other to cut the passband. So this is necessary to get things done REALITIVELY inexpensively. You can just buy the Omega 394NB4 for 160 usd Here: http://www.ebay.com/itm/Optical-Filter-Astronomy-394NB4-CaK-filter-1-25-Eyepiece-/150811106688?pt=LH_DefaultDomain_0&hash=item231d0add80 and try and cut the pass deeper. That is my next experiment. The stack I name here cut the passband down to ~equal to that of the 394DF4 (I did do a literal comparison). The DF4 is more convenient cuz it just screws in. A less expensive axial tilter can be constructed to help cut this one closer to the actual 393.4 <1 nm passband. If you want to save money wait till I conduct that experiment and repost. Why not just buy a CaK. I think you know the answer to this. THEY ARE EXPENSIVE! If you can get one! The Lunt and Coronado’s are a 700 USD buy in. The wait times for these items are 1-6months. The other big outlet is Chroma and they want waaaay to much for their filter. The stack I used for the shot you see is done with a 407BP2 in place of the 410BP10. It was donated to me by a colleague helping in the search for POBOYS CalK device. Clear Skies, Sullij Edited by sullij1 (08/08/12 11:12 PM) Post Extras:       sullij1 Pooh-Bah Reged: 11/08/08 Re: CalK Homebrew From Last Sunday [Re: sullij1]       #5358922 - 08/08/12 10:41 PM Edit   Reply   Quote Quick Reply   BTW, this is photography only! Not tested for visual! CalK is not really visible to most of us anyway. Remember be safe, Photography only if you try this. Post Extras:       mbucky Post Laureate Reged: 10/21/07 Loc: San Diego Re: CalK Homebrew From Last Sunday [Re: sullij1]       #5361260 - 08/10/12 08:24 AM Edit   Reply   Quote Quick Reply   nice work and excellent post. Post Extras:       sullij1 Pooh-Bah Reged: 11/08/08 Re: CalK Homebrew From Last Sunday [Re: mbucky]       #5361951 - 08/10/12 03:21 PM Edit   Reply   Quote Quick Reply   Thanks Ocean Beach (SD Rules) It has been a fun and ongoing project. Cheers Edited by sullij1 (08/10/12 03:27 PM) Post Extras:       Pages: 1

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