Re: [Frameworks] Bolex and Beaulieu lens mount inquiry

From: Paul Krimmer (email suppressed)
Date: Wed Jul 21 2010 - 13:18:21 PDT


i dont know exact photographic behaviour - never joined a technical
education ... i only see what im thinking to get the clue together. why
is the DOF a different if you use the 35mm photo lense on a 16mm
camera????? and why i can get a sharp picture with an adapter? luckily
i´ve found a angenieux f2.2 12-120mm to work with, because i was
thinking there are some tricky disturbances around the theme... but can
you tell me a explanation of those things, with an nikon adapter + 55mm
nikor macro i can do pretty well too... to the last point, i have once
read a technical sheet, if you put down some f-stops the spherical
abberation gets in balance with the filmplane - the softness is quite
disturbing i agree, you have always go further... but of course its no
real satisfying solution, because there´s is never enough light, so
stopping down you can only live with a big range of sharpness, and the
dark viewfinder-image will make disorientation. so once again, adapter
is no solution, why?
btw: here´s a link about corrected rx lenses
http://www.bolexcollector.com/articles/07_03_21.html

Sam Wells schrieb:
>
>
> On Wed, Jul 21, 2010 at 2:26 PM, Paul Krimmer <email suppressed
> <mailto:email suppressed>> wrote:
>
> But if you use a c-mount to e.g. a nikon-adapter you do have 35mm
> still
> cam depth of field
>
>
> Wrong
>
>
> and the focus distance get in with a little
> difference at the distance marks (but remember the focal length is a
> different cause of the smaller mask) -
>
>
> Wrong
>
>
>
>
> -> the . RX-lenses are not sold a
> lot, and are expensive.
>
>
> You can find them at fair prices.
>
>
>
> of course the spherical aberration and
> astigmatism is a point of perfection,
>
>
> Matter of choice.
>
>
> But normal c-mount
> lenses with bolex reflex is bollocks.... with normal-cmount you
> can only
> go down 2 oder 3 stops to increase the DOP the prism gets out of
> the game
>
> I'm not sure what you mean. Stopping down masks the problem. However
> I've found faces will go soft (where strong verticals, say will not on
> 25mm non-RX Switar used on Bolex Rex even at ~ f 5.6
> ------------------------------------------------------------------------
>
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