Test MAF homemade

[vincio85]

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I ask elucidations to the more experts on the behavior of the optic M I concern the tests of mass to fire for the breve and averages distances.

Perhaps escapes me something!

 

Usually when I make accurate tests of the mass to fire, I prepare on a table 5 batteries in oblique (45° about), distant the one dal'altra of 3cm, subsequently provides the Leica M9 of enlarger 1,4x and the position on tripod in front of the central battery to the same height, subsequently tries all the distances departing from 0,7m.

 

My question is: I understand the physiological problems of pre-aspheric lenses, stopping down where you focus shift, but it is possible also happen with aspheric optics floating element?

 

Generally with my optics, departing from f1.4 with mass to distance fire of 0,7 / 1 meter I have a light front focus of around 1,5/2cm, closing the diaphragm it gradually moves him in back thin focus to have to f2.8/f4 the fire correctly to the center?

 

Also with optics aspherical floating element must confirm this behavior?

 

I bring a photo example of as I prepare the batteries for the tests

 

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