Re: [photo-3d] reverse rings / macro question

["don lopp" <dlopp@xxxxxxxxxxxxxxx>]

I As far asI Know, the current Sigma macro lenses  E X series are the equal
of most any big name brand though the Canon 5 power has no copmpetition as
it magnifies up to 5 times  although I prefer stereo macros of less life
size.  I have not seen the Sigma Macro 180mm but it got an excelant reviue
in England. Don.
----- Original Message -----
From: <boris@xxxxxxxxxxxx>
To: <bob@xxxxxxxxxxxxxx>
Cc: <photo-3d@xxxxxxxxxxx>
Sent: Monday, June 12, 2000 8:00 PM
Subject: [photo-3d] reverse rings / macro question


> Bob:
>
> I've been looking for a prime lens to do quality macros with my cameras
> (Pentax bayonet system).  I got rid of those 40-80zoom macros lenses.  I
> didn't get enough magnification out of them, and I think the image quality
> was not as good as needed.
>
> A NY mail order house lists a NEW Sigma 50/f2.8 macro lens for $159.-
>
> That seems quite a bit lower than the 250-350 I typically see for such a
> macro lens.  Is Sigma a cheapo off brand, or do you think this might be a
> good value?
>
> I want the macro capability for jewelry/product photography.  Sharpness at
> high f-numbers (small apertures) is important.
>
> ANother question: under the heading macro, I see "reversing rings"
> advertised, for something like $10.  I assume these are for turning a
prime
> lens around, for shooting through the lens backwards.  Retrofocus?  As I
> would do macros infrequently, is that a good solution for doing macros?
It
> certainly seems cheaper, sounds good to me!
>
> Finally, what's the difference between getting a macro in 50mm f.l. as
> opposed to something like 100mm f.l. ?   (For stereo I imagine the 50 to
be
> better, as one could get a decent stereobase, without having to toe-in the
> cameras as much, because the camera would be used closer to the subject.
> Are the higher f.l. macros mainly for shooting macro at a distance?)
>
> Thanks for any advice
>
> Boris
>
>
>
> P.S. to all other than bob, this post is 3-d related because I am a 3-d
> photographer!
>
>
> - Science is the part of culture that rubs against the world.
> -
> -                                     Stanislaw Lem, _His Master's Voice_
>
> Boris Starosta                        boris@xxxxxxxxxxxx
> Stereoscopic Art & 3-D Photography    http://www.starosta.com
> usa - 804 979 3930                    http://www.starosta.com/3dshowcase
>
>
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