Re: WTB Long Working Distance Micro/macroscope

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
>>
>>
>

.

Relevant Pages

  • Re: Camera Recommendations Requested
    ... and decontented the lens and body. ... directly in the camera for JPG output. ... JPG image on the computer where those finer RAW sensor details are already ... external flash units, heavy tripods, more expensive larger filters, etc. ...
    (rec.photo.digital)
  • Re: The sickening reality of high ISO on a P&S
    ... D40 that comes close to the lens on the FZ8. ... shoot similar shot under same conditions with your FZ8. ... P&S cameras can have more seamless zoom range than any DSLR glass in ... slightly greater detail retention when upsampled directly in the camera for JPG ...
    (rec.photo.digital)
  • Re: Connecting EOS 10D to Zeiss ICM 405
    ... > projection distance is different from the distance it is designed for. ... necessity of a relay lens in general. ... eyepiece/relay lens and a camera image sensor. ... irrelevant for a setup with an external shutter. ...
    (sci.techniques.microscopy)
  • Re: Earthquakes and epicentres
    ... What does it mean with lenses? ... The camera has been positioned so ... A person looking at an image naturally infers the distance between the ... In the sample images on that web page, the camera position relative to the foreground object, the orange, is changed, as the lens focal length is changed. ...
    (alt.usage.english)
  • Re: Lens design questions
    ... how does one go about designing a lens system ... You buy a ready-made camera lens. ... You can't possibly design ... Elementary optics govern the distance from object to image, ...
    (sci.optics)