Fisheye-NIKKOR 6mm f/1.4

[RonVol]

The impressive speed might be easier to achieve when the image circle is small.

The lens appears to be around the same physical size as the f/2.8.
I'm wondering if in fact it's the 6mm f/2.8 but , because of the reduced image area, they've gained an increase in speed.
Would this be possible?

[Bjørn Rørslett]

No.

It's the light gathering that counts, not what is delivered at the rear end. The size of the entrance pupil is the important parameter and this is set by the lens design.

[RonVol]

No.

It's the light gathering that counts, not what is delivered at the rear end. The size of the entrance pupil is the important parameter and this is set by the lens design.

Ok, thanks...................I guess that makes sense.

[Dr Klaus Schmitt]

The impressive speed might be easier to achieve when the image circle is small.

The long "tail" of the lens might include a built-in relay system.

A pity these lenses are so elusive, should be fun to experiment with.

IF it doesn't have NIKON written on it, I could help. Let me know.... ;-)

[Bjørn Rørslett]

I'm all ears, Klaus.

[Dr Klaus Schmitt]

I'm all ears, Klaus.

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