rondo
Established
I am experimenting with a Nikon 3x teleconverter on Ricoh GR.
You can see a sectional diagram of the Nikon lens here:
https://ibb.co/fjmOqF
Is there mechanical modification that I can do on the Nikon to reduce the vignette?
Reducing the space between the fixed lens of the camera and the rear glass of the converter will help to an extent: I hope to manage to remove the rear ring holding the rear glass together, shave it off, and reinstall. that should help a little, but not eliminate it altogether.
I was wondering if reducing the space between the front and rear glass groups would help at all?
That's doable mechanically, but I am not aware of its optical consequences: will the lens stop focusing for example? Or will the magnification ratio change? But I feel like reducing the length of the tube will reduce vignetting. Does that make any sense at all?
You can see a sectional diagram of the Nikon lens here:
https://ibb.co/fjmOqF
Is there mechanical modification that I can do on the Nikon to reduce the vignette?
Reducing the space between the fixed lens of the camera and the rear glass of the converter will help to an extent: I hope to manage to remove the rear ring holding the rear glass together, shave it off, and reinstall. that should help a little, but not eliminate it altogether.
I was wondering if reducing the space between the front and rear glass groups would help at all?
That's doable mechanically, but I am not aware of its optical consequences: will the lens stop focusing for example? Or will the magnification ratio change? But I feel like reducing the length of the tube will reduce vignetting. Does that make any sense at all?