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mawz wrote:
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You sure about that? An apodizing element changes the T stop of the lens but should not affect DoF which is mostly controlled by physical aperture. The 135STF has the DoF you'd expect for a 135/2.8 when shot wide open.
Lets say the feeled DOF is bigger - and this is what counts for me, and I think most photographers as well.
As example: The outer circular aperture ring has 0.0001% light transmission - so with darker bokeh circles you donīt see this any more.
With dark exposed unsharp objects and a real camera with limited dynamic range you will not see for example the outer 2 mm circular ring of the aperture - and so bokeh will look like made with a slower lens.
With bokeh completely (!) overexposed DOF is the same with or without apodizing element.
But you need some bright highlights for that, cause the optical density of the apodizing filter needs some f-stops more till overexposure.
But then there is no more apodizing effect for these highlights.
You could see this on a comparison image at the bottom of this page:
http://www.nathanelson.com/blog/the-fuji-56mm-apd/
This is a misconception of the apodizing effect.
You get better bokeh in terms of smooth bokeh illumination. But the blur will get smaller, the DOF a bit bigger. So for the photographers who think "good bokeh" = "big blur" this lens could be disappointing.
There is no such thing like a free lunch.
I do not have the 135STF, and I do not know its real entrance aperture size. Probably the lens has a bigger entrance pupil like normal 135mm/2.8 lenses. Or there is no exact comparison made.
The less transmitted light from the outer area is additional the reason why the lens is regarded more contrastier than the normal version. In terms of blur size, DOF and sharpness / contrast is is more like a stopped down lens.
Edited on Sep 22, 2014 at 04:14 AM · View previous versions
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