Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Film photography on a C9.25

  • Please log in to reply
1 reply to this topic

#1 Rahul

Rahul

    Lift Off

  • *****
  • topic starter
  • Posts: 6
  • Joined: 24 Aug 2008

Posted 10 August 2020 - 12:45 AM

Hi forum,

 

I've been doing visual observations using my C9.25 on it's single-arm Evolution mount. If I had a film cameras like an Olympus OM-1 with a 50mm f/1.4, could I do any amount of reasonable film astrophotography using using the scope itself, or piggybacked & using the 50 mm?

 

I've used film in the past and even dabbled in some film developing by hand. I don't expect CCD level pictures (most definitely limited by my own skills than the equipment). But, what could I expect? What challenges would I face using the C9.25 as my lens?

 

 

Best

 



#2 Todd N

Todd N

    Messenger

  • *****
  • Posts: 413
  • Joined: 07 Dec 2007

Posted 10 August 2020 - 01:19 AM

Sure. The SCT would make a fine guide scope for piggy back with SLR. If you would want to do prime focus you should use a focal reducer with an off axis guider to ensure mirror flop doesn't ruin a long exposure. But, off axis guider can be difficult and tedious to acquire guide stars with manual eyepiece guiding. There is no guarantee there will be a bright enough guide star where you need one. Autoguiding is preferred.  That's a lot of focal length and you would need to see  your skies are steady enough to image at that higher focal length. In my neck of the woods the atmospheric conditions won't allow it. You can determine this by doing some practice guiding with an illuminated guiding eyepiece.

 

My off axis guiders are older models no longer made so, I'm not exactly sure what would work today. See if you could mate Celestron's current OAG with their generic .63 reducer.

 

https://www.celestro...off-axis-guider

https://www.celestro...ducer-corrector

 

The .63 reducer works with their old Radial Guider if you can find a used one.

 

SCT Universal Piggyback Mount for SLR

https://www.celestro...f3382fee6&_ss=r




CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics