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[Login] Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Equipment Discussions >> Video and Electronically Assisted Astronomy Previous   Index   Next   Threaded   Pages: 1 highfnum Carpal Tunnel Reged: 09/06/06 Loc: NE USA image intensifer with 0.7nm ha filter       #5558275 - 12/06/12 09:03 PM Edit   Reply   Quote Quick Reply   I just tried omega 7A ha filter with 80 pct transmission With image intensifier Very smooth image Post Extras:       GlennLeDrew Postmaster Reged: 06/18/08 Loc: Ottawa, Ontario, Canada Re: image intensifer with 0.7nm ha filter [Re: highfnum]       #5558396 - 12/06/12 10:29 PM Edit   Reply   Quote Quick Reply   The title states 0.7nm (which would be a very narrow bandpass appropriate for solar prominences), yet the body of the post states 7nm (which is good for nebulae); which is it? And what did you observe fir this test? Post Extras:       highfnum Carpal Tunnel Reged: 09/06/06 Loc: NE USA Re: image intensifer with 0.7nm ha filter [Re: GlennLeDrew]       #5558457 - 12/06/12 11:16 PM Edit   Reply   Quote Quick Reply   7A is 0.7nm 7A is angstroms 10A = 1nm but I will check with spectroscope tomorrow yes normally for solar - but solar Ha and I got a couple have low tramsmission rates 50 pct or less this one for night sky has 80 pct so II does not get photon starvation I tried solar Ha on II - NG noise level skyrockets i tried new one on horsehead tonight - best view in II so far Edited by highfnum (12/06/12 11:18 PM) Post Extras:       highfnum Carpal Tunnel Reged: 09/06/06 Loc: NE USA Re: image intensifer with 0.7nm ha filter [Re: highfnum]       #5558671 - 12/07/12 04:37 AM Edit   Reply   Quote Quick Reply   one more thing 5-10 A is good form proms only for solar Ha filter types a true solar filter to see surface has to be 1A (.1nm) and lower (0.7A) thats 10 times more narrow than this filter Post Extras:       Jim Chung Vendor - Icodome Reged: 12/07/05 Loc: Toronto Re: image intensifer with 0.7nm ha filter [Re: highfnum]       #5559128 - 12/07/12 11:36 AM Edit   Reply   Quote Quick Reply   Here's my dilemma. I've been experimenting with a wide bandpass Ha of about 20 nm and a superfast Schmidt camera modified for visual use, 300mm focal length and f/1.2 and when I view with a Gen 3 II in very light polluted Toronto I can't see that much. M42 is as visible as on the Collins I3 website but I cant make out the North American nebula and even M27 is very very hard to discern. Very disheartened because I wanted to use this superfast setup for public outreach. Any comments? Jim Post Extras:       highfnum Carpal Tunnel Reged: 09/06/06 Loc: NE USA Re: image intensifer with 0.7nm ha filter [Re: Jim Chung]       #5559193 - 12/07/12 12:13 PM Edit   Reply   Quote Quick Reply   20nm seems very wide 10nm is the most open one I have Also you must use shields from stray light Do you have layout and any pics Post Extras:       highfnum Carpal Tunnel Reged: 09/06/06 Loc: NE USA Re: image intensifer with 0.7nm ha filter [Re: highfnum]       #5559195 - 12/07/12 12:14 PM Edit   Reply   Quote Quick Reply   Go to my gallery I got lots of pics with ii Post Extras:       Jim Chung Vendor - Icodome Reged: 12/07/05 Loc: Toronto Re: image intensifer with 0.7nm ha filter [Re: highfnum]       #5559222 - 12/07/12 12:30 PM Edit   Reply   Quote Quick Reply   I always thought the wide bandpass would compensate for the shift in peak filter transmission due to fast optics. Your gallery is phenomenal. So the images you captured with your Canon are similar to what you see visually? And these were taken at a dark site, not city and without Ha filter? Do you have any Ha filtered images? Post Extras:       highfnum Carpal Tunnel Reged: 09/06/06 Loc: NE USA Re: image intensifer with 0.7nm ha filter [Re: Jim Chung]       #5559232 - 12/07/12 12:37 PM Edit   Reply   Quote Quick Reply   Most with Ha filter except galaxy shots 60 miles from center of Manhattan Photos slightly brighter than human view But all that is in photo you can see Post Extras:       BrendanF super member Reged: 12/04/07 Loc: Los Angeles, CA Re: image intensifer with 0.7nm ha filter [Re: highfnum]       #5559835 - 12/07/12 07:10 PM Edit   Reply   Quote Quick Reply   Here is a nice Cloudy Nights article about image intensifier eyepieces and narrow band H-alpha filters: Collins I3 "System" Post Extras:       jdbastro super member Reged: 08/18/07 Loc: W. Coast Re: image intensifer with 0.7nm ha filter [Re: highfnum]       #5559899 - 12/07/12 08:07 PM Edit   Reply   Quote Quick Reply   So you are saying that you can see HII regions (like Rosette, Horsehead) with a 0.7nm H-alpha filter and your image intensifier (II)? I have used a 7nm (Baader) and 12nm (Astronmik) h-alpha filter with my II's with great success on HII regions. I am VERY surprised to hear that a 0.7nm filter would give you sufficient light input without light starving your II. Where did you get this filter from? Thanks. Post Extras:       highfnum Carpal Tunnel Reged: 09/06/06 Loc: NE USA Re: image intensifer with 0.7nm ha filter [Re: jdbastro]       #5560006 - 12/07/12 09:41 PM Edit   Reply   Quote Quick Reply   I was happy about it also There is as far as I know this the most narrow filter For night time Omega optical Post Extras:       StarStuff1 Carpal Tunnel Reged: 04/01/07 Loc: South of the Mason-Dixon Line Re: image intensifer with 0.7nm ha filter [Re: highfnum]       #5560085 - 12/07/12 10:37 PM Edit   Reply   Quote Quick Reply   Rosette, HorseHead, Barnard's Loop, California, Heart and Soul Nebs, Pacman, etc are easy with a Gen III and Ha filter and a 70mm fast scope. I have experience with a Gen I but not Gen II. Post Extras:       PEterW professor emeritus Reged: 01/02/06 Loc: SW London, UK Re: image intensifer with 0.7nm ha filter [Re: StarStuff1]       #5562310 - 12/09/12 11:55 AM Edit   Reply   Quote Quick Reply   Anyone got any useful results with a narrow OIII (or SII etc) filter? Interested to see if things still work? Cheers pEterW Post Extras:       highfnum Carpal Tunnel Reged: 09/06/06 Loc: NE USA Re: image intensifer with 0.7nm ha filter [Re: PEterW]       #5562371 - 12/09/12 12:31 PM Edit   Reply   Quote Quick Reply   I tried SII OIII - nothing as good as Ha SII second best because its in red region OIII nuttin much I3 do not work well in green area when weather breaks ill try to get some test shots until then nuttin to do but drink a little Post Extras:       ccs_hello Postmaster Reged: 07/03/04 Re: image intensifer with 0.7nm ha filter [Re: highfnum]       #5562522 - 12/09/12 02:04 PM Edit   Reply   Quote Quick Reply   Jon, A question for ya... I thought Etalon is the popular mechanism to deliver sub-nm scale narrow-band imaging, while Omega Optical makes a lot of interference filters which rarely go narrower than 10nm? Can you describe the narrow-band filter you use? Clear Skies! ccs_hello Post Extras:       highfnum Carpal Tunnel Reged: 09/06/06 Loc: NE USA Re: image intensifer with 0.7nm ha filter [Re: ccs_hello]       #5562575 - 12/09/12 02:34 PM Edit   Reply   Quote Quick Reply   etalon is used for sub Angstrom - thats 1/10 of 1nm like pst and lunt solar scopes .5-.9A - that is less than 1A and 10A = 1nm (etalon = mucho money) Omega Optical method 10nm = 100A are the relative easy ones but their method can go down to 1.5A (uh price goes up) this narrowband is 7 to 8A interference filter lately there has been progress in mnfg methods once weather breaks im hoping to take series of shots with spectroscope it real cool looking thru a 1nm filter - you can see just how narrow it really is the h-alpha line is about 1.2A wide here is shot thru my spectroscope - the thick line is ha - just think an etalon 'Goes inside that line!" http://www.cloudynights.com/photopost/showphoto.php?photo=17725 Edited by highfnum (12/09/12 02:40 PM) Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 7 registered and 5 anonymous users are browsing this forum. 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