Re: WTB Long Working Distance Micro/macroscope

Thanks Aaron for your valuable comments!

Indeed the latter was my idea, to use a catoptric or catadioptric lens
system - only problem with the latter is the lack of an aperture. The former
system (sometimes) comes with an aperture, so this would be what I am
looking for. The Kataptaron LDM-1 had that as had it the Infinity
MRM-1, the only problem is to find those!!!

A focal length of about 500mm seems to be ideal.

The distance should be several meters, since these objects (insects
mostly) are very sensitive.

Klaus


"Aaron" <nghy@xxxxxxxxxxx> schrieb im Newsbeitrag
news:3cbm61dvciekf098ht7ruprl1qs7kc6k3a@xxxxxxxxxx
> As you know, the typical macro setup is designed for situations where
> the subject is close to the camera lens.
>
> I suggest you try a telephoto lens with extension rings or an
> extension bellows. As I mentioned before, I had a Minolta 35mm camera
> fitted with extension rings and a 135mm telephoto lens, that worked
> well at three to four feet. I could fill the frame with a small
> flower. The lens had a diaphragm. In general, this system provided
> very natural looking images with little sense that the subject was so
> r removed from the front lens. The same idea can be used with stronger
> telephoto lenses. The question here is your term "great distance".
> How far is that?
>
> Ultimately, a 35 mm camera can be fitted to spotting scopes, a short
> tube refracting telescope or a catadioptric telescope. The Celestron
> C5 or C8 fitted on an altazimuth mount might be good candidates.
> There are all sorts of adapters and fittings to go between the
> telecope and the camera back. For subjects as samll as those that you
> want to photograph, I don't think depth of field will be an issue. I
> found that the out of focus fore and distant ground helped define the
> subject.
>
> As you increase the distance and magnification, you will need greater
> light gathering power to maintain resolution and detail. You will
> need to use very short exposures to get sharp images. This fact of
> life also mediates towards larger objective lenses. The C8 has a
> relatively large objective and is just portable. Smaller scopes
> loose resolution and brightness.
>
> Aaron
> .
>
> On Sat, 23 Apr 2005 20:59:41 +0200, "Klaus D Schmitt"
> <kds315@xxxxxxxxx> wrote:
>
> >I should have been more precise:
> >
> >The lens I am looking for is a macroscopic lens for SLR and 16mm Film
> >applications, not a microscope lens. It will be used to capture rare and
> >very
> >sensitive animals up to 1/8" and smaller from great distance.
> >
> >The intended magnification range is between 0.1x and max. 3x, the lens
> >has to have a built in aperture (iris) to control Depth of Field (DOF).
> >
> >All the types I mentioned have this ability
> >
> >Thanks to Kevin & Aaron!
> >
> >Klaus
> >
> >
> >"Klaus D Schmitt" <kds315@xxxxxxxxx> schrieb im Newsbeitrag
> >news:d4b3ju$p92$03$1@xxxxxxxxxxxxxxxxxxxx
> >> Need a macro/microscope lens with widest possible working distance.
> >> There has been the Katoptaron LDM-1 and the MRM-1 by Infinity Optical
> >> and the Questar M1.
> >>
> >> Any ideas, offers, sources, documents most welcome!!
> >>
> >> Thanks
> >>
> >> Klaus D Schmitt
> >>
> >> kds315 AT yahoo DOT com
> >>
> >>
> >
>


.

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