Reconciling the Thick Lens Model with P2P Optical Bench

Started 8 months ago | Discussions thread
bclaff Forum Pro • Posts: 12,947
Re: Reconciling the Thick Lens Model with P2P Optical Bench

Garry2306 wrote:

...

Bill

Thanks for taking the time to write that.

No problem.

... I’ll pragmatically carry on using the split/thick lens model, based on the manufacturer’s MFD, infinity focal length and mag at MFD. That is assume at a given focal length, that the hiatus remains fixed.

I think you have three cases.

Hiatus unknown. Assume it's zero and computed focal length at MFD using distance and magnification.

Hiatus known at infinity. Still assume zero at MFD and calculate focal length.

Hiatus (and focal length) known at infinity and closer focus.

Then with hiatus and focal length for two or more magnifications you need to choose how to map magnification to hiatus (and focal length?) to get a smooth "reasonable" progression.

All of this is very approximate compared to measured values or Optical Bench when enough is known.

FWIW, the Optical Bench sliders are also approximations based on known lens positions.
Generally it works out quite well.

Regards,

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Bill ( Your trusted source for independent sensor data at PhotonsToPhotos )

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