· Get a Cloudy Nights T-Shirt · Submit a Review / Article Click here if you are having trouble logging into the forums Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User You are not logged in. [Login] Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Equipment Discussions >> Cats & Casses Previous   Index   Next   Threaded   Pages: 1 Adam E Pooh-Bah Reged: 06/29/09 Loc: Orlando, FL Meade 12 LX200 (Not ACF) Backfocus for PF AP?       #5657969 - 02/02/13 11:36 AM Edit   Reply   Quote Quick Reply   Hello CAT lovers, I have a 2006-ish vintage Meade 12 OTA (not an ACF scope) that I regularly enjoy using for planetary fun. I recently picked up a T4i that has found itself on my old Vixen ED80sf for a night of giggles with M41/42, and I'm looking to try it mated up to the big Meade for fun. I'll be toying around in the wonderful world of coma and F10 as I don't currently have an F6.3 reducer/corrector for the scope. So, my question is, what would be the ideal backfocus distance between the rear end of the OTA and the camera sensor that I should shoot for? Any guidance is much appreciated. Post Extras:       rmollise Postmaster Reged: 07/06/07 Re: Meade 12 LX200 (Not ACF) Backfocus for PF AP? [Re: Adam E]       #5657990 - 02/02/13 11:51 AM Edit   Reply   Quote Quick Reply   The distance provided by your prime focus adapter will be fine. But you really, really need to get that focal length down. Post Extras:       Adam E Pooh-Bah Reged: 06/29/09 Loc: Orlando, FL Re: Meade 12 LX200 (Not ACF) Backfocus for PF AP? [Re: rmollise]       #5658031 - 02/02/13 12:16 PM Edit   Reply   Quote Quick Reply   Hi Uncle Rod. Thanks for the responce, but my problem is that I don't have the standard T-Adapter. I once lived under relatively dark skies and got involved with CCD AP with a number of scopes. I have since moved to light pollution central, have sold the ST8300M I used to use, but I still have all the pieces-parts to mate up the T4i with just about any backfocus distance desired. So, I just need to know what that distance is, or alternatively, how long the standard Meade adapter is. And, yeah, I know, dealing with 3000+ mm of focal length is probably going to cross the border into ridiculous, but this is just for fun and curiosity. If all I manage to do this evening is come up with a few train-wreck subs before slewing to Jupiter and pulling out my DBK21, that's all good. Post Extras:       rmollise Postmaster Reged: 07/06/07 Re: Meade 12 LX200 (Not ACF) Backfocus for PF AP? [Re: Adam E]       #5658043 - 02/02/13 12:28 PM Edit   Reply   Quote Quick Reply   About 50mm or so. Post Extras:       Adam E Pooh-Bah Reged: 06/29/09 Loc: Orlando, FL Re: Meade 12 LX200 (Not ACF) Backfocus for PF AP? [Re: rmollise]       #5658073 - 02/02/13 12:46 PM Edit   Reply   Quote Quick Reply   10-4, thanks! For comedy, I'll update with tonight's antics. Post Extras:       Adam E Pooh-Bah Reged: 06/29/09 Loc: Orlando, FL Re: Meade 12 LX200 (Not ACF) Backfocus for PF AP? [Re: Adam E]       #5658669 - 02/02/13 06:20 PM Edit   Reply   Quote Quick Reply   The plot thickens... Post Extras:       Adam E Pooh-Bah Reged: 06/29/09 Loc: Orlando, FL Re: Meade 12 LX200 (Not ACF) Backfocus for PF AP? [Re: Adam E]       #5659843 - 02/03/13 11:56 AM Edit   Reply   Quote Quick Reply   Didn't go too bad, but yes, yes, I do definitely need a reducer / correcotr as this scope is way too much fun to not use effectively. "The Core" with an non-modded T4i at ISO800, 100 X 30 Sec... Post Extras:       rmollise Postmaster Reged: 07/06/07 Re: Meade 12 LX200 (Not ACF) Backfocus for PF AP? [Re: Adam E]       #5659846 - 02/03/13 11:57 AM Edit   Reply   Quote Quick Reply   Sweet! Post Extras:       Raginar Carpal Tunnel Reged: 10/19/10 Loc: Rapid CIty, SD Re: Meade 12 LX200 (Not ACF) Backfocus for PF AP? [Re: rmollise]       #5663226 - 02/05/13 10:04 AM Edit   Reply   Quote Quick Reply   I'd be pretty happy with that Was that unguided? Post Extras:       Adam E Pooh-Bah Reged: 06/29/09 Loc: Orlando, FL Re: Meade 12 LX200 (Not ACF) Backfocus for PF AP? [Re: Raginar]       #5663713 - 02/05/13 02:52 PM Edit   Reply   Quote Quick Reply   Thanks Uncle Rod and Raginar! I was guiding with my ED80sf / SSAG piggy-backed. On a side note, just received shipping notification on my reducer/corrector from Astronomics, and it should be in my hot little hands by this weekend. Might have to roll out the big gun again if the weather cooperates. Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 27 registered and 16 anonymous users are browsing this forum. 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