[pure-silver] Re: 90mm lens for 4x5 recommendations

Rob is right. An often overlooked fact.





Regards



Ralph W. Lambrecht




On 9/13/04 9:46 PM, "Rob Champagne" <psps@xxxxxxxxxxxxxxxxxxxxxx> wrote:

> Ah but as the focal length gets shorter and the "depth of field" gets longer
> the "depth of focus" at the film plane gets shorter so what you gain in one
> hand you lose in the other making film plane and focus accuracy critical.
> 
> rob
> 
> At 13/09/2004 13:29 -0500, you wrote:
>> Michael Healy wrote:
>>> 
>>> (snipped)...Speaking of FWIW, you should see what the 6-1/2x8-1/2
>>> Bausch+Lomb 158mm Zeiss
>>> Protar Series V does on an 8x10...
>>> 
>> 
>> Drool, drool.  210 is my short 8x10 lens, and I love
>> what 90 does to the world on 4x5, so I salivate at the
>> thought of something this short.  And as the lens gets
>> shorter we fortunately find the depth of sharp focus
>> improving, so it's maybe not so necessary to part with
>> massive cash for a larger image circle for corrections.
>> 
>> John - I should have mentioned, re our older slower
>> lenses.  Close the dark cloth below the camera too,
>> shut out all extraneous light so your eyes will open up
>> more.  Poor man's fast lens.
>> 
>> Regards...   Dick Gifford
>> 
>> 
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