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Sony 85mm F2.8 SAM Prime Comparison to Zooms

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QuietOC View Drop Down
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 24 June 2016 at 18:01
Originally posted by addy landzaat addy landzaat wrote:

On other lenses there is a significant difference between MFD, Mid distances and infinity.

I am curious. What other lenses specifically?

The 100-200 F4.5 and 28-135 F4-4.5 are two I've tested at much greater distances because they seem to perform relatively poorly on the test chart, and they have a reputation for being sharp. This 28-135 actually looks fairly good in this test.
Sony A7RIV LA-EA5
Pentax Q7 5-15 15-45/2.8 8.5/1.9 11.5/9
 



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Miranda F View Drop Down
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 25 June 2016 at 06:49
Originally posted by addy landzaat addy landzaat wrote:

At what focus distance? The more experienced I get I find that focus distance is very important. Some lenses are great at longer distances but lousy at MFD and the other way round.


+1
Miranda F & Sensorex, Sony A7Rii, A58, Nex-6, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras ...
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 25 June 2016 at 06:54
These differences are only obvious at 100% crop, right? I wouldn;t normally use 100% crops except for birding, though I do habitually check pictures after taking with the 100% crop view function in the EVF to check they were focussed correctly. Most of my pictures with the dt zooms do look sharp then, and if they don't I usually re-take them.

But they are so sharp (in the centre, at least) that the slightest mis-focus will affect this, which makes their effective DOF much smaller than you would expect for that aperture, when you check them this way. I suppose I'm saying that they maintain a high micro-contrast well up to the limits of the sensor.
Miranda F & Sensorex, Sony A7Rii, A58, Nex-6, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras ...
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 10 September 2016 at 16:10
Updating this using the A65 and the big new test chart and more lenses.

Tamron SP 60mm F2 @ ~85mm f/2.8 on a Kenko DGX 1.4X TC

Just a little wider than the SAL85F28

Minolta AF 24-85mm F3.5-4.5 @ 85mm f/4.5

Internal focus zoom is quite a bit wider

Sony 16-80mm f/3.5-4.5 Carl Zeiss Vario-Sonnar T DT @ 80 mm

A little wider than the Minolta above, but it doesn't claim to reach 85mm.

f/2.8 Center


f/2.8 Top Left


f/2.8 Bottom Right


You can use the shorter/faster primes on a teleconverter, but the results are rather mediocre.

f/4, f/4.5, f/5 Center


f/4, f/4.5, f/5 Top Left


f/4, f/4.5, f/5 Bottom Right


f/5.6 Center



f/5.6 Top Left



f/5.6 Bottom Right



f/8 Center



f/8 Top Left



f/8 Bottom Right



The Sony DT 55-200mm F4-5.6 SAM and Minolta AF 28-105 F3.5-4.5 look similarly decentered.

Edited by QuietOC - 10 September 2016 at 20:58
Sony A7RIV LA-EA5
Pentax Q7 5-15 15-45/2.8 8.5/1.9 11.5/9
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