Canon Community Canon Community
 


Reply
Highlighted
New Contributor
Posts: 3
Registered: ‎10-15-2020

EOS M100 and sharp focus with a telescope

Hello.  Long time astronomy fan, but new to cameras and astrophotography.

 

Learned how to change settings, (shutter release w/out lens, ISO, exposure time), but am struggling to get a sharp focus.  Stars and planets are blurry.

 

Canon EOS M100 attached to a Meade LX90 (8" SCT/ 2,000mm focal length).

 

Any suggestions would be appreciated.  Thanks in advance.

 

 

Highlighted
Esteemed Contributor
Posts: 4,238
Registered: ‎02-17-2016

Re: EOS M100 and sharp focus with a telescope

How are you attaching it? Normally the focus is all in the telescope.

Highlighted
New Contributor
Posts: 3
Registered: ‎10-15-2020

Re: EOS M100 and sharp focus with a telescope

I attach with a T2 EOS-M and Meade #62 T adapter into the scope.  Using the telescope focuser hasn't gotten images sharp, but in my reading, I have seen I may need to use a diagonal or slide the adapter out a little (tighten with scope's thumb screw) to add a little more length.  Cloudy tonight, so will have to wait for next, clear night.  

Highlighted
VIP
Posts: 10,557
Registered: ‎08-13-2015

Re: EOS M100 and sharp focus with a telescope

I would try the EF/EFM mount adapter and a T-Mount for the EF mount to add the distance.

----------------------------------------------------------------------------------------------------------------------------------------------------------

"Doctor told me to get out and walk, so I bought a Canon."
Highlighted
VIP
Posts: 13,162
Registered: ‎12-07-2012

Re: EOS M100 and sharp focus with a telescope

The distance from the back of the Celstron and the camera focal plane is critical. It has to be correct or you will not be able to achieve focus (infinity). There are adapters that are designed to position your camera's image plane at the optimal distance. The focus adjustment built into the lens may not be sufficient if that measurement is not correct as you have seen. 

EOS 1DX and 1D Mk IV and several lenses!
Highlighted
New Contributor
Posts: 3
Registered: ‎10-15-2020

Re: EOS M100 and sharp focus with a telescope

Interesting.  Here is current setup to attach camera to scope.  I see that Meade also has a variable length adapter, which I just ordered from Amazon ($30 and free returns if not useful).  20201015_111029.jpg

Highlighted
VIP
Posts: 13,162
Registered: ‎12-07-2012

Re: EOS M100 and sharp focus with a telescope

That will probably work (long or short enough) you need to get the length correct.

EOS 1DX and 1D Mk IV and several lenses!
powered by Lithium

LIKE US on Facebook FOLLOW US on Twitter WATCH US on YouTube CONNECT WITH US on Linkedin WATCH US on Vimeo FOLLOW US on Instagram SHOP CANON at the Canon Online Store
© Canon U.S.A., Inc.   |    Terms of Use   |    Privacy Statement