a 180mm lens that would make an awesome macro lens for 8x10

Leigh B said:

Hi Dan,

Not meaning to quibble, but...

If you use 1:1 as the close-focus limit, your maximum lens FL is about 1/2 the bellows draw, which would be 18" in this case.

The other 2xFL (@ 1:1) is in front of the lens and is not involved in the bellows draw calculations.

- Leigh

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Leigh B said:

OK. I find no mention of 3:1 earlier in the thread.

- Leigh

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Dan Fromm said:

See post #18 in this thread.

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Leigh B said:

This is getting quite confused.

Post #18 is by Bob Carnie, not the OP, and he does not mention a 36" bellows.

Jim Galli mentions a 36" bellows in his response to Bob's post, again not the OP.

My post was directed at the OP's original question. (Apologies for trying to stay on-topic.)

- Leigh

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