[APML] Hartmann Mask

["Teo Mattas" <t_mattas@hotmail.com>]

Hello group, greetings from Greece!

I have a Zenit SLR camera and a 250mm f/3.5 lens.My problem is that I can't 
find every time the true infinite focus with absolute accuracy.Will a 
Hartmann Mask solve my problem?I can't ''trust'' my eyes because I have 
astigmatism and wear eyeglasses.What should I do??


                                                                             
                           Teo

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