>Ken Norton wrote:
>> Oops, do we have a magnification ratio calculation error here?
>> You will only get greater than life size by
>> reversing a longer focal length on a shorter focal length.
>> ...when in doubt, reference John Shaw's books...
>
Now taking 40 lashes with a wet cable release. I not only went home and
checked John Shaw's books, but I also verified his writings too.
A 50/1.4 reversed on a 100/2.8 results in 2x magnification, not .5x as I
previously was thinking.
Further testings yesterday proved that stopping down the reversed lens is
NOT recommended. It had very little affect on exposure or DOF, but caused
major vignetting.
Sorry about inducing confusion into the list.
Ken (crawling on broken Vivitar glass) Norton
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