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Natural Science Forum / Physics / Optics / July 2007Dumb question on c-mounts
OK...this might be a totally dumb question, but before I spend the money on the adapter, I want to make sure that I get the right one. I'm going to mount a older polariod dmc2 camera on a zeiss microscope. The information for the camera states that for the c-mount adapter, "Any standard 1:1 c-mount .63mm (.25in) can be used without any additional adapters". OK...I'm on the Zeiss site and their adapters are something like: "Adapter Video 2/3 0.63x". I looked at other sites and this specification seems to be universal. Unfortunately, not exactly sure how to translate the camera specs to a c-mount. Any translation help here greatly appreciated. TIA, Joe > Any translation help here greatly appreciated. The Zeiss adapter you cite provides a 0.63x shrink of the standard C-mount image, suitable for a 2/3 size video chip. Your camera says it wants a 1.0x (non)shrink on the C-mount image. So that Zeiss adapter with that camera will fill only 0.63 of the camera frame with the microscopic image. Functional, but you're using few of the camera's pixels. Depending on how you want to crop the microscopic field onto the camera frame, you want (I expect) less of a shrink. Choose a crop factor, and that will determine what C-mount adapter optics you need. http://www.truetex.com/micad.htm#cmount > Choose a crop factor, and that will determine what C-mount adapter > optics you need. > > http://www.truetex.com/micad.htm#cmount Actually, looking at my own Web page above and your 2/3 chip means you have an 11mm chip diagonal, so an 0.63X C-mount adapter will give you about that size of a circular field (11mm diameter), so maybe you have what you want after all, if you want to crop the camera's rectangle just inside the scope's circle. Hi... There are other options on the Zeiss site: Adapter video 44 C 2/3 0.63x Adapter video 44 C 1/2 0.5x Adapter video 44 C 2/3 1.0x Then there are Adapter video 60 (same other specs) and some others to boot. I found them all here: https://www.micro-shop.zeiss.com/us/us_en/czshop.php?cp_sid=86083c7cdc2&cp_tpl=main Is the C 2/3 0.63 still the best, given the other options available? Totally confused. Joe > > Choose a crop factor, and that will determine what C-mount adapter > > optics you need. [quoted text clipped - 6 lines] > after all, if you want to crop the camera's rectangle just inside the > scope's circle. > Is the C 2/3 0.63 still the best, given the other options available? What kind of crop do you want? Hi again... Well, I imagine that the ideal answer is 'none', but then again, ignorance is bliss and that might be the wrong answer. Since you're the expert, I'll do whatever you would do in this case. Joe > > Is the C 2/3 0.63 still the best, given the other options available? > > What kind of crop do you want? > Well, I imagine that the ideal answer is 'none', but then again, > ignorance is bliss and that might be the wrong answer. Specify how you want to crop the circular field onto the camera rectangle. Inscribed, outscribed, in between, what? Use the 1.0x C-Mount with the Polaroid DMC. The chip Size of the DMC is a little too big to use the 0.63x C-Mount, and you will get vignetting. Your best bet, since a 1x C-Mount is nothing but a piece of metal with the appropriate thread on one side, and a flange on the other, with no optics of any kind, to use a 3rd party C-Mount adapter (Diagnostic Instruments has Direct Projection C-Mounts fairly cheap, or if your scope is a newer model Axio, then use a Motic C-Mount, they fit fine, and are very cheap) Victor |
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