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Do different diagonals have different focal lengths. 

I have a altair lightwave which I have had to butcher to get I shoulderless adapter in as my Tal could not focus anything below a 10mm. 

I just wondered if I tried a different diagonal would that be different. 

Thank you 

Paul 

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They do vary a bit. I have a cheap one that I have to use with one of my scopes because the more expensive one would not get close enough to focus. I'm not sure by how much they different though - only a few mm's.

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