Re: Official: Sony A7 and A7R Fullframe Mirrorless
turnstyle wrote: charles.K wrote:
Having the variability in test results with the A7r, I just performed some micro caliper measurements on three adapters I have:
2 Novaflex M to E mount
1 Metabones from Sony: M to E mount
The 2 Novaflex adapters have a flange thickness that is 9.71mm to 9.73mm.
The 1 Metabones adapter from Sony, has a flange thickness of 9.91mm.
The difference of 0.2mm in optical flange tolerance is very large, and may the reason why there are some variability in test results.
The Metabones adapter, does not have any drift beyond infinity, and matches really well, with virtually no play in the lens mount. The two Novaflex adapters fall short of infinity, and there is some torsional play in the older lenses.
I might send my Novaflex adapters to Camera Clinic, in Melbourne, and see if the tolerances can be tightened to where infinity matches and there is no play in the M lenses.
Hah, I\'ve been banging this drum, but it has been lonely.
Novoflex told me their adapter should be 9.74mm -- which makes it intentionally short (with \'technically correct\' being 9.80mm). Metabones wouldn\'t tell me what their adapter should measure (but 9.91mm is clearly too wide, which is a bigger problem than too short).
If you keep testing, I hope you keep posting back here.
I suspect Sony supplying these adapter indirectly, may have provided the specs for the Metabone adapters. All my M lenses are very accurately calibrated, and fitting them with the Metabones adapter, the infinity aligns accurately. I suspect the flange width of 9.91mm would be accurate dimension that works. I now know the 9.71/9.73mm does not work well, and it the width dimension used for the Novaflex adapters. I will have these both sent away and shimmed
I do wonder what difference the 0.2mm would have in moving the rear element away from sensor, and lessening the angle of incidence.
Re: Official: Sony A7 and A7R Fullframe Mirrorless
turnstyle wrote: charles.K wrote:
Having the variability in test results with the A7r, I just performed some micro caliper measurements on three adapters I have:
2 Novaflex M to E mount
1 Metabones from Sony: M to E mount
The 2 Novaflex adapters have a flange thickness that is 9.71mm to 9.73mm.
The 1 Metabones adapter from Sony, has a flange thickness of 9.91mm.
The difference of 0.2mm in optical flange tolerance is very large, and may the reason why there are some variability in test results.
The Metabones adapter, does not have any drift beyond infinity, and matches really well, with virtually no play in the lens mount. The two Novaflex adapters fall short of infinity, and there is some torsional play in the older lenses.
I might send my Novaflex adapters to Camera Clinic, in Melbourne, and see if the tolerances can be tightened to where infinity matches and there is no play in the M lenses.
Hah, I\'ve been banging this drum, but it has been lonely.
Novoflex told me their adapter should be 9.74mm -- which makes it intentionally short (with \'technically correct\' being 9.80mm). Metabones wouldn\'t tell me what their adapter should measure (but 9.91mm is clearly too wide, which is a bigger problem than too short).
If you keep testing, I hope you keep posting back here.
I suspect Sony supplying these adapter indirectly, may have provided the specs for the Metabone adapters. All my M lenses are very accurately calibrated, and fitting them with the Metabones adapter, the infinity aligns accurately. I suspect the flange width of 9.91mm would be accurate dimension that works. I now know the 9.71/9.73mm does not work well, and these for the Novaflex adapters. I will have these both sent away and shimmed
I do wonder what difference the 0.2mm would have in moving the rear element away from sensor, and lessening the angle of incidence.
Dec 15, 2013 at 07:59 PM
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