Return to the Cloudy Nights Telescope Reviews home pageAstronomics discounts for Cloudy Nights members
· 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

Equipment Discussions >> Cats & Casses

Pages: 1
Adam E
Pooh-Bah
*****

Reged: 06/29/09

Loc: Edgewood, NM
Meade 12 LX200 (Not ACF) Backfocus for PF AP? new
      #5657969 - 02/02/13 11:36 AM

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: Print Post   Remind Me!   Notify Moderator  
rmollise
Postmaster
*****

Reged: 07/06/07

Re: Meade 12 LX200 (Not ACF) Backfocus for PF AP? new [Re: Adam E]
      #5657990 - 02/02/13 11:51 AM

The distance provided by your prime focus adapter will be fine. But you really, really need to get that focal length down.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Adam E
Pooh-Bah
*****

Reged: 06/29/09

Loc: Edgewood, NM
Re: Meade 12 LX200 (Not ACF) Backfocus for PF AP? new [Re: rmollise]
      #5658031 - 02/02/13 12:16 PM

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: Print Post   Remind Me!   Notify Moderator  
rmollise
Postmaster
*****

Reged: 07/06/07

Re: Meade 12 LX200 (Not ACF) Backfocus for PF AP? new [Re: Adam E]
      #5658043 - 02/02/13 12:28 PM

About 50mm or so.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Adam E
Pooh-Bah
*****

Reged: 06/29/09

Loc: Edgewood, NM
Re: Meade 12 LX200 (Not ACF) Backfocus for PF AP? new [Re: rmollise]
      #5658073 - 02/02/13 12:46 PM

10-4, thanks! For comedy, I'll update with tonight's antics.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Adam E
Pooh-Bah
*****

Reged: 06/29/09

Loc: Edgewood, NM
Re: Meade 12 LX200 (Not ACF) Backfocus for PF AP? new [Re: Adam E]
      #5658669 - 02/02/13 06:20 PM

The plot thickens...



Post Extras: Print Post   Remind Me!   Notify Moderator  
Adam E
Pooh-Bah
*****

Reged: 06/29/09

Loc: Edgewood, NM
Re: Meade 12 LX200 (Not ACF) Backfocus for PF AP? new [Re: Adam E]
      #5659843 - 02/03/13 11:56 AM

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: Print Post   Remind Me!   Notify Moderator  
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

Sweet!

Post Extras: Print Post   Remind Me!   Notify Moderator  
Raginar
Post Laureate
*****

Reged: 10/19/10

Loc: Rapid CIty, SD
Re: Meade 12 LX200 (Not ACF) Backfocus for PF AP? new [Re: rmollise]
      #5663226 - 02/05/13 10:04 AM

I'd be pretty happy with that Was that unguided?

Post Extras: Print Post   Remind Me!   Notify Moderator  
Adam E
Pooh-Bah
*****

Reged: 06/29/09

Loc: Edgewood, NM
Re: Meade 12 LX200 (Not ACF) Backfocus for PF AP? new [Re: Raginar]
      #5663713 - 02/05/13 02:52 PM

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: Print Post   Remind Me!   Notify Moderator  
Pages: 1


Extra information
17 registered and 33 anonymous users are browsing this forum.

Moderator:  Cotts, Starman27, kkokkolis 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled


Thread views: 502

Jump to

CN Forums Home


Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics