>Apparently the astronomical community is way ahead of us. They
>have such a thing already, called a"focal reducer".
Not quite... The focal reducer does give a brighter image, but it covers
less area of the film, so the field of view remains unchanged. Thru a
'scope, it's quite common to get severe vignetting with the reducer, but
since the picture is usually cropped, it doesn't matter.
>Wouldn't it be nice to put our 50/1.4 on the new ODSLR and get an f/0.5
>with a normal field of view? Or the 250/2 and get a 100/0.7?
I'm afraid these things aren't "universal", like teleconverters or Barlow
lenses (the astro version of a teleconverter); they are designed for an
specific focal length. There might be problems with flange-to-film (or CCD)
distance, also.
...
Carlos Santisteban
<cjss@xxxxxxxxxxxxx>
<cjsantis@xxxxxxxx>
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|