Posted 01/19/2013 8:56 pm
cc57,
No, this one is a "finite" objective and can't be attached to the front of a lens. To attach on front of a lens, you need an "infinite" objective, ie one that is designed to be placed on the front of a lens focused at infinity.
I also am needing to caution you about using a lens in this way on your camera. Unfortunately I forgot that the focal length of the 990/995 cameras is quite short, so the magnification with an infinite objective will be lower than expected. Most infinites require at least 100mm and preferably 200mm lenses. I expect the lens on the 990/995 is only 30-50mm max, not long enough and would likely produce strong vignetting. Take a look at the front of your lens and it should say Nikkor XX-YYmm fx-y. If the YY is much shorter than 100mm I don't think my suggestion will work very well. That said, there are other solutions to the problem other than microscope objectives, for instance mounting a small loupe on the front of the lens as an objective. But any of these solutions will take some experimentation. I wish I still had my 990 so I could try some things out to suggest, but alas it took the brunt of a bad DC power supply and was blown up when the supply blew...
No, this one is a "finite" objective and can't be attached to the front of a lens. To attach on front of a lens, you need an "infinite" objective, ie one that is designed to be placed on the front of a lens focused at infinity.
I also am needing to caution you about using a lens in this way on your camera. Unfortunately I forgot that the focal length of the 990/995 cameras is quite short, so the magnification with an infinite objective will be lower than expected. Most infinites require at least 100mm and preferably 200mm lenses. I expect the lens on the 990/995 is only 30-50mm max, not long enough and would likely produce strong vignetting. Take a look at the front of your lens and it should say Nikkor XX-YYmm fx-y. If the YY is much shorter than 100mm I don't think my suggestion will work very well. That said, there are other solutions to the problem other than microscope objectives, for instance mounting a small loupe on the front of the lens as an objective. But any of these solutions will take some experimentation. I wish I still had my 990 so I could try some things out to suggest, but alas it took the brunt of a bad DC power supply and was blown up when the supply blew...
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