Re: WTB Long Working Distance Micro/macroscope


Gordon Couger wrote:
> George wrote:
> > 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
> >
> >
> > I forgot to say that with a short FL of the objective you
> will obtain
> > a greather magnification than with a long FL.
> >
> > With 8 X binoculars and an objective of 200 mm of FL, you
> will obtain
> > 10 X and the distance of the objective from the sample will
> be the FL,
> > then 200 mm.
> >
> > If you use a compact porro prism binoculars, you could obtain a
> > stereoscopic microscope.
> >
> > George
> > giocar3ABC@xxxxxxxxx
> > Remove A B C
>
> You might try a low powered eyepiece and short tube microscope
> with a low power objective. In a piece for Miscape
> www.microscopy-uk.org.uk/mag/artjan03/gcshorttube.html Using a
> 1x Leitz Plan on 80 mm tube with a 10x objective I got about
> 100mm working distance and 12.5 mm Leitz Photar that belonged to
> Charley Meyer sowed promise with a eyepiece and it has an Iris.
>
> I don't know if you could find a combination of lens eyepiece
> and tube length that would give the 200 mm working distance but
> a less expensive lens would be cine lenses with reversed coated
> Kodak Ektars leading the pack.
>
> Gordon
> Gordon Couger
>
> I collect links on information related to light microscopes.
> www.couger.com/microscope/links/gclinks.html
> Please forward anything you think might be useful to others.
> Microscope Documentation is at www.science-info.org

Gordon, I don't think using a reversed Cine Ektar will get much working
distance at all. Remember that the C-mount flange-to-film distance is
17.52 mm. That's slightly more than the lens' minimum working distance
because, at least for my 15 mm and 25 mm CEs, the rear element
protrudes behind the flange.

Cheers,

Dan

.

Relevant Pages

  • Re: Kimwipes (5*8 wipes) v.s. Lens Paper?
    ...  Wiping a lens surface dry just scratches the heck out of it, ... The main difference between cameras and microscopes is the size of the ... camera and a microscope. ...
    (sci.techniques.microscopy)
  • Re: How to distinguish 160 vs 170 mm eypieces?
    ... condenser & eyepiece iris diaphragms, ... requires a well-corrected lens system to focus the image, ... optical axis after one image plane back to parallel or converging so it ... Unless your microscope is unusual, this will be true of it as ...
    (sci.techniques.microscopy)
  • Re: How can I build a simple Microscope
    ... one word of a caution-- saying "I have the objective, what do I need to do to make a microscope?" ... An objective and a webcam is all that is needed to get a working microscope. ... The only work is making a tube to hold the camera and objective lens square and centered and keeping out stray light. ...
    (sci.optics)
  • Re: Extension rings for macro
    ... The point of posting the link is, he removed the lens on the camera & just imaged directly to the microscope which gave much improved results. ... objective and the sensor. ... eyepiece to that of the DSLR lens. ...
    (rec.photo.digital.slr-systems)
  • Re: Assembly assistance, Zeiss GFL Microscope
    ... > We received the older Zeiss GFL microscope via Fedex and did not ... The lens assembly approximately 1/4 inch in thickness. ... > permanent part of the microscope, or was an attachment for photography? ... > binocular eyepiece assemblies? ...
    (sci.techniques.microscopy)