Backfocus for OAG

Focusers, Filters, Barlows etc..

Moderator: Sam

Post Reply
niccoc1603
Posts: 8
Joined: Mon Dec 17, 2018 8:05 pm

Backfocus for OAG

Post by niccoc1603 » Sat Feb 01, 2020 10:22 am

Hi I have the following setup:
ASI1600MM, ZWO EFW, ZWO OAG.

Backfocus to camera can vary

I want to use the OAG with a Lodestar X2 camera (backfocus 12.5mm), what extensions do I need? Thanks

Katherine.Tsai
Posts: 520
Joined: Fri Dec 07, 2018 10:24 am

Re: Backfocus for OAG

Post by Katherine.Tsai » Tue Feb 11, 2020 8:38 am

Please refer to this guide and calculate the back focus you need, to decide whether you will need a extender and which do you need.
https://astronomy-imaging-camera.com/tu ... -55mm.html

Post Reply