red dwalf Posted April 18, 2014 Share Posted April 18, 2014 using my altair 80 with the 0.8 focal reducer on what would be the proper distance to the atik titan ccd chip, i`ve got a figure of around 55mm, does this sound about right ? many thanks Link to comment Share on other sites More sharing options...
Brantuk Posted April 18, 2014 Share Posted April 18, 2014 (edited) From the rear shoulder of the flatener/reducer to the chip you need 51-56mm Rob - I believe there's a little tolerance inbuilt but you can experiment for the best results. The Titan has a 13mm back focus from the edge of the T-ring so you'll want to make up 38-43mm in between. Are you using a filter wheel? What are the dimensions? (ie distance from front to back) - you'll need to subtract that as well. E.g. if you're aiming for 55mm then it's: 55mm - 13mm - filter wheel mm = spacer mm. The camera goes straight on the back of the filter wheel, then the spacer between the filter wheel and flatener/reducer. Hth Edited April 18, 2014 by Brantuk Link to comment Share on other sites More sharing options...
glider Posted April 18, 2014 Share Posted April 18, 2014 55mm rings a bell Rob. Link to comment Share on other sites More sharing options...
red dwalf Posted April 18, 2014 Author Share Posted April 18, 2014 thanks guys, i had 45mm then added a 10mm spacer, let dee what comes out later Link to comment Share on other sites More sharing options...
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