Archived posting to the Leica Users Group, 2002/05/16

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Subject: Re: [Leica] mirror lens
From: "Don Dory" <dorysrus@mindspring.com>
Date: Thu, 16 May 2002 14:14:06 -0400
References: <Springmail.0994.1021571807.0.09197000@webmail.pas.earthlink.net> <3CE3F6B9.F6728ABB@earthlink.net>

SD, a mirror lens is not really F8, probably 10-13 depending on the make.
However, you are using a TTL meter so that doesn't matter.  You might have
to us stop down metering on your camera to get the proper shutter speed.
Then put the camera into P or A mode and see what your camera does in the
same lighting.  If there is no difference in shutter speed you are good to
go.  If the shutter speed is different then set whatever exposure
compensation is appropriate to bring the shutter speed in line with your
previous reading.

Now, a really clever person would also take a reading with a hand held meter
to determine the exact transmission of the lens in question so that you can
read a scene once and shoot away.  Say someplace where TV lights are
present.  Last, before anything important needs to be recorded I would
recommend shooting some known film stock with 1/2 stop brackets to confirm
everything.

Enjoy, I occasionally use a Tamron 350mm macro mirror for the funky
background.  With the appropriate adapter I can use it on all my SLR bodies.

Don
dorysrus@mindspring.com

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Replies: Reply from S Dimitrov <sld@earthlink.net> (Re: [Leica] mirror lens)
In reply to: Message from Douglas Herr<telyt@earthlink.net> (Re: [Leica] mirror lens)
Message from S Dimitrov <sld@earthlink.net> (Re: [Leica] mirror lens)