PeterA
Well-known member
Hi Jono,Hi Peter
Hmm - I think Tim Ashley did some 'definitive' tests, and Leica have certainly acknowledged it as a feature of the lens. Never having owned the lens I can't remember the tests, but presumably you focus at around 2 metres at f1.4 on a point on a receding scale, and then change the aperture successively downwards and look at the point of correct focus - I remember seeing examples where the focus point at f1.4 was well out of focus at f2 until around f8 (where the dof rescued it again).
But maybe you have a magic lens?
all the best
hmmmm so the focus shifts along a line away from a point either front or back accordign to aperture used?
well that isnt a definitive test for me at all - in fact from my naive perspective it is a very silly test that says nothing much about anything much useful or interesting to me..- let me explain before being accused of being a bore...
My 'definitive test is about how I make a photograph using any camera and any lens. First I look at the light and decide what is possible - then I consider how much DOF I wish to use and how much separation I wish to use - that pretty much delivers the aperture and speed combo required - then I focus and ..go click
in this world the only focus shift that can occur is from a poorly aligned rangefinder or shaky hands - I have experienced both.
Now if someone can point to me the relevance of the focus shift test - that would be interesting...is my aspherical ( with focus shift I can never see) a poor lens? really? In what away would this focus shift - have ANY baring on making ANY photo ever?
Pete