Re: [PanoToolsNG] Nikon lens on Canon body: Setting the aperture using the J-Pin
- Ingemar Bergmark wrote:
> This is a small pin you can make for adjusting the aperture when using
> Nikon lenses on a Canon body.
> A friend of mine inspired me to make this, and I've dubbed it the "J-
> Pin". With the pin you can set an aperture of f/8, f/5.6 and f/2.8 (I
> haven't made actual measurements on the aperture values, but they are
> Check out this link to see how it works;
> Ingemar Bergmark
This is a great idea, but I think your measurements are not correct. I made
one out of plastic, but then noticed how different the various measurements
were compared to the little "pins" I use, so I decided to re-measured
A thickness of 3mm gives a value of ±f9 and a thickness of 3.45mm gives a
value of ±f6.3
The way I measured this was to compare a sigma 8mm on a canon 350D with a
Nikkor 10.5mm on a canon 5D, with both exposure metering areas set to
"partial metering" . This way both cameras measure the same area and there
is no influence of the amount of "black" that is not covered by the partial
circle that both lenses produce on the sensors of the 350D and the 5D.
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