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Old Mar 11, 2005, 3:39 AM   #1
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This is my second post about the use of Nikon lenses on A95. Here is a list of previous related posts:

(1) Adapter Tubes: http://www.stevesforums.com/forums/v...mp;forum_id=15

This post is about the Nikon Fisheye lenses on a A95. Nikon made two fisheye lenses: FC-E8 for 950/990/995/4500/5000 and FC-E9 for 5700/8700/8800. Although both are 0.2X (i.e., making the A95 combo to have a 7mm focal length – 35mm equivalent), capable of slightly larger than 180 degree angle of view, the FC-E9 is larger and hence heavier in order to match the larger lenses of 5700, 8700 and 8800. As a result, the FC-E8 uses 28mm thread, while the FC-E9 uses 46mm.

The following two images show a FC-E8 and a FC-E9 on a A95. As you can see from the images, the FC-E9 is much larger than the FC-E8.

Mounting the FC-E8 on a A95 is simple as long as we have a 37-28mm thread converter. Mounting the FC-E9 has two options, however. One can use the Canon (or LensMate) 52mm adapter tube and a 52-46mm step-down ring or thread converter. Or, one can use Nikon's UR-E7 ring, which is a 28-46mm step-up ring, and the LensMate 37mm tube with a 37-28mm thread converter. Since the fisheye converter FC-E8 is heavy, the Photosolve 37-28mm thread converter is not able to hold it sturdy in the thread. One can still twist the lens a little when it is on the 37-28mm thread converter. The situation of the Canon adapter tube plus a 52-46mm step-down ring is not much better because the Canon tube does not sit tight on its base. A better solution could be the use of the 37mm LensMate tube, followed by a 37-46mm step-up ring and the FC-E9 fisheye; however, this setup can be big and heavy and may not be your best choice.

The image below was taken with the FC-E8 with the A95 lens zoomed all the way out. In this case, the combo is a 7mm circular fisheye lens with a coverage of about 180 degree. The next image was taken at the same position with the camera lens zoomed in so that the image covers the whole LCD. This is the full frame fisheye mode. The A95 focal length is about 16.2mm, which is about 14.5mm in 135mm equivalent. Many long zoom digicams cannot focus in this full frame mode; but, this short zoom Canon A95 locks on the subjects in every shot flawlessly.

Here are two more examples. Look carefully at the circular fisheye image, and you will see the position of the image circle is slightly different from the following one which touches the bottom edge of the frame. This could be the problem of a non-sturdy 37-28mm thread converter. A different way of holding the lens can tilt the lens up or down, shifting the image circle. This is the main reason that a better thread converter that can stay in the thread firmly is required.

Warning: There are many cheap semi-fisheye lenses around. They are not true fisheye lenses. In fact, they are uncorrected (for barrel distortion) wide or ultra wide angle lenses. For example, if you search the Internet or eBay, you will see many 0.25X, 0.3X or even 0.45X lenses claimed to be semi-fisheye lenses. However, they rarely reach the 180 degree coverage, and, as a result, the image circular may be too large for your A95. Even though some of them can produce a circular image on your A95, they may not be true fisheye lenses because they do not have a 180 degree coverage.



Nikon Coolpix 950/990/995/2500/4500/5700 and Panasonic FZ-10 User Guides

shene is offline   Reply With Quote
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Old Mar 11, 2005, 8:57 AM   #2
Join Date: Jan 2005
Posts: 33

Very nice post (also the other one only with the adapters)... very good informations...
I do not own a A95 but the owners of it will be indeed graceful.
Keep up the good work.
Bodhi is offline   Reply With Quote

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