Bahtinov mask - does size matter??

[Skipper Billy]

Can I use a Bahtinov mask designed for a 72mm scope on a 61mm scope ???

Properly centred ?

[JamesF]

I don't see that it should be a problem.  I imagine it would probably work even if it weren't properly centred, though some of the spikes may not be as clear.

James

[vlaiv]

9 minutes ago, Skipper Billy said:

Can I use a Bahtinov mask designed for a 72mm scope on a 61mm scope ???

Properly centred ?

Sure you can. Even if you don't center it properly - it won't change operation of the mask - only intensity of each spike (but not angles).

[Skipper Billy]

Thanks all - just saved me £17 !

Cheers!!