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Galactic Wanderer

Focus issues with Canon and 1 25 Adapter (New Baader filter attached)

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Hi all,

Have a problem with focusing my Canon 1100D connected to a sky watcher newtonian via a 1 25 adapter with a baader uhc filter in it. Optimal focus is a lot closer to the telescope than I can go, so was just wondering how I can fix this. 

cheers x

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Hi

You shouldn't have a problem focusing the 150pds but you shouldn't be using a 1.25" nosepiece. Normally you'd have a t-ring plus coma corrector which would just slide in the focus tube. If you don't have a cc then I think a 2" adapter will do.

Louise

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2 minutes ago, Thalestris24 said:

Normally you'd have a t-ring plus coma corrector which would just slide in the focus tube. If you don't have a cc then I think a 2" adapter will do.

I usually use this method but the point is I'm using a filter which is sized 1 25. 

x

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3 minutes ago, Galactic Wanderer said:

I usually use this method but the point is I'm using a filter which is sized 1 25. 

x

You can't really and if you did you'd get bad vignetting. Better to get a 2" filter or an Astronomik ccd clip filter :)

Louise

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2 minutes ago, Thalestris24 said:

You can't really and if you did you'd get bad vignetting. Better to get a 2" filter or an Astronomik ccd clip filter :)

Louise

alright but i know other people image with this particular filter and DSLR. Is it to do with the telescope? 

 

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In terms of focus it's the way you connect. Normally you want to attach at prime focus. The distance from the primary mirror via the secondary and through to the sensor has to be 750mm for the 150pds.

Louise

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