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Apodization filter with a SMC Takumar 1:1.4/50
Posted By: willdmo, 02-27-2015, 12:42 PM

I came across an interresting project where somebody tried to achieve the Effect Apodization filters can have on Bokeh and Photography
Markus Keinath experimented with differen slide to achieve the effect known from the Sony 135mm f/2.8 [T4.5] STF and the Fujifilm XF 56mm F1.2 R APD.
Both lenses, but with different techniques have a manipulated diaphragm. The center stays clear, whereas to the borders the density of the Iris becomes gradually darker and softens the image.
The differenc to a common Iris is there is no hard border between the "closed" Iris and the "free lens". THe impact on Bokeh is that it becomes very smooth and the highlights have no shaped lines, but very soft and blurred edges.

Till now some people published in the Internet that they used Positive slides made from an Photoshop graphic with a circular graduation filter. The downsides are: The Filter is not completely black at the border, which should be like that. The Black is not neutral but has any colour like blue or purple and the "colour" fades with time.

To perform this manipulation, you would need a lens, where the position of the diaphragm is easily reachable. Of course is it possible to place such an filter anywhere in the optical path, but the place of the diaphragm suits best.

Tools:
A spare UV or Skylight filter (something between 33mm and 35mm)
Putty
screwdriver or spanner wrench
Benzin lighter or anything else to produce soot
a cylinder and rubber gloves (or something similar) to remove the name plate
a black permanent marker ot black paint

for sooting the filter I used a computer fan and a trombone mouthpiece but here you can use anything. The goal is to place the filter on something heat resistant and be able to turn it to apply the soot gradually to the center but point symmetrical and hinder the soot to cover the center of the filter.

the rest is written in the instruction and pictures with the lens will follow as soon as I took them



and here the lens


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02-27-2015, 01:18 PM   #2
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Interesting... any samples with the end results at different apertures?
02-27-2015, 02:08 PM   #3
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QuoteOriginally posted by mrNewt Quote
Interesting... any samples with the end results at different apertures?
I used a lens with sady totally broken aperture and performed the transformation today. Examples will follow. The ffect will only be visible wide open and until up to f2.8 because the center is untouched.
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apodization, apodization filter, bokeh, center, diaphragm, diy, do it yourself, effect, fifty, filter, iris, lens, lens hacking, smc takumar, soot, takumar 1.4/50 aperture, yourself
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