Swapping Lens cells

[croppitt]

What is a "Linhof comfort board"? Never heard that term...

https://www.linhofstudio.com/product...board_with_QRS

[William Whitaker]

https://www.linhofstudio.com/product...board_with_QRS

Seems like £265 = DIS-comfort. Just sayin'...

[Dan Fromm]

Hi Dan, Sorry, I just don't understand. Could you explain. No idea what bit you think is the wrong approach. Any help or advice is greatly appreciated as I am no expert.

I answered your question directly and correctly in post #2. I read post #4 as talking about swapping front cells, remarked on that in post #6. Mark might have been suggesting that you check the front cells' pupillary magnifications, which have nothing to do with focal length, to find out whether aperture scale on the shutter on the recessed Linhof board will be right for the lens you're swapping in.

[Mark Sawyer]

Why on earth would the OP want to swap a Sironar's front cell with a Symmar's front cell?

Forgive my lack of clarity, Dan. I wasn't suggesting making a hybrid lens. I was suggesting comparing the two different front cells' focal lengths, to see if they had the same magnifying power. If one is stronger, it would magnify the aperture more, giving a larger entrance pupil. That would throw the aperture scale off. But as I said, in this case, I wouldn't think by much.

[croppitt]

Okay, got it. Thanks, makes sense. Best John

[Mark Sawyer]

...Mark might have been suggesting that you check the front cells' pupillary magnifications, which have nothing to do with focal length, to find out whether aperture scale on the shutter on the recessed Linhof board will be right for the lens you're swapping in.

The focal length of the individual front cells may be different, meaning their individual magnifications also would be different, so yes, they have something to do with each other.

[croppitt]

The focal length of the individual front cells may be different, meaning their individual magnifications also would be different, so yes, they have something to do with each other.

Makes sense, thanks Mark