Do you know any a high magnification MACRO/MICRO LENSES designed for large format sensors such as Full-frame or APS-C, which is used for observation of my experiments. I am searching the lenses with optical magnification larger than 20X and long working distance (>3 cm).
Less than 5 µm object should be seen by using combination of the lens and a DSLR camera.
One candidate was found as shown by the attached link. Its maximum magnification is 16X. I am expecting to find a better one. Pls tell me if you know any better solutions.
Thanks a lot.
http://www.infinity-usa.com/products.aspx
How important is working distance?
The Infiniprobe TS-160 achieves 16x magnification at 18 mm working distance. At 28 mm working distance, magnification is only 4x.
Have you considered using a long working distance microscope objective - either with a suitable tube lens, or projecting directly onto the camera sensor.
https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=9922&pn=MY10X-803
http://www.edmundoptics.com/microscopy/infinity-corrected-objectives/mitutoyo-infinity-corrected-long-working-distance-objectives/46398/
The Olympus SLMPN 20x has a shorter (25 mm) working distance, but appears to be specified for a larger image circle (26.5 mm).
http://www.edmundoptics.com/microscopy/infinity-corrected-objectives/olympus-super-long-working-distance-m-plan-achromatic-objectives/86824/
There could be some loss of resolution without a tube lens, but you should have no problems imaging objects less than 5 microns. If there is significant performance drop-off in the corners of an APS-C or FF sensor, you could use a 1.4x or 2x teleconverter on your DSLR, but this may not be necessary.
Dear Cong and Alan, Just comment about Olympus SLMPN. According to Olympus web site, numeber 26.5 shown in Edmund catalogue is the field number (F.N.), which is related to the filed of view (F.O.V.) as FOV=FN/Mag. Therefore, FOV=26.5/20=1.325mm, in this case. Regards, Shigeo
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