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 Re: FM Review: Sony FE 12-24mm f/2.8 GM | |
Fred Miranda wrote:
rvh23 wrote:
Fred Miranda wrote:
rvh23 wrote:
I realized tonight I've been doing this the hard way. Putting the adhesive shims temporarily on the outside of the lens' mount plate (or on the camera's mount) should work just as well for exploratory purposes, and avoids removing the plate on each iteration. I will try some more variations tomorrow, and post if I get any further imrovements.
Is the lens decentered or focal plane tilted? The best way to find out is to focus at the very corners individually and compare them. If they corners look equal, the lens is not decentered and there is hope of fixing the asymmetry. The trick with zooms is that as we change focal length, the focal plane usually gets swung or tilted and therefore shims may not work for all FLs.
There is definately a consistent tilt/swing that has improved across the whole range with the shim I installed. But in addition to that, the lower left corner does seem slightly weaker (perhaps a little more astigmatism) even when each corner is focused on in turn. I'm really on the fence with this copy. I know it could be better but it could be a whole lot worse too, and stopped down a bit it's fine.
Does that softer corner improve when focusing on it? If not, the lens could have a decentered element as well.
Shimming can fix with focal plane tilt/swing but it won't be useful if the lens is decentered.
A fellow FM member just emailed me his centering test and his lens looked excellent at 12mm and 24mm.
I received mine this AM and thoroughly tested it. The lower-left corner is ever so slightly out (almost imperceptible), but not enough to ever worry about. Overall, this is an outstanding lens! Whew!! Well done, Sony.
I can see where this will likely become on of my favorite lenses and it might even keep me from ordering an R5. 
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