Author Topic: Chipping a Nikkor - A Walk-through  (Read 50580 times)

Erik Lund

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Re: Chipping a Nikkor - A Walk-through
« Reply #45 on: October 21, 2021, 10:03:08 »
A Nikon CPU has the following:

The lens ID number, exit pupil size, maximum and minimum aperture, focal length, distance calibration information, type of lens; MF/AF/AF-D/AF-I/AI-P/AF-S/AF-G/PC-E/E-Type and G-Type
I believe Birna enters all except distance calibration information.

See this post for more info:
https://nikongear.net/revival/index.php?topic=36.msg128#msg128
Erik Lund

Bern

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Re: Chipping a Nikkor - A Walk-through
« Reply #46 on: October 21, 2021, 12:47:21 »
A Nikon CPU has the following:

The lens ID number, exit pupil size, maximum and minimum aperture, focal length, distance calibration information, type of lens; MF/AF/AF-D/AF-I/AI-P/AF-S/AF-G/PC-E/E-Type and G-Type
I believe Birna enters all except distance calibration information.

Thank you Erik for the added information. Would a missing information on the CPU used result in an exposure error?

For the Dandelion chips, are all these also programed into the chips? Or is just Focal length & aperture settings?

Keep shooting,
Bern

Erik Lund

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Re: Chipping a Nikkor - A Walk-through
« Reply #47 on: October 21, 2021, 13:43:03 »
The camera is dependent of all of these data to make an educated guess as to how the lens is performing, if data is incorrect something will be off for instance exposure or accurate focus.

For instance exit pupil is very important on wide and ultra wide angle lenses with regards to exposure calculations for the camera. Tested and confirmed especially on for instance 15mm and 16mm lenses.

Dandelion CPU's has generic data stored and only aperture values and focal length is 'programmable' via the most archaic interface seen in decades.

PS distance data is mostly used for flash photography
Erik Lund