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08-03-2009, 10:50 PM   #1
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17mm Fish-eye filter question

As I've never owned or handled one, I was wondering where the included built in filters in the M42 17mm Fish-eye Takumar reside when they're not dialed into the path of the lens?

08-04-2009, 04:30 AM   #2
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I expect the 17mm to work the same as my 16mm Fisheye or almost any other lens with internal filters.

The filters are quite small, just enough diameter to cover the internal lenses near the aperture, where the lenses have the smallest diameter (usually). So they are packed in a larger filter wheel, which can be rotated from the outside via the filter selector. One of the filters is either clear glass (UV filter) or a Skylight and should be used, when no colour filter is selected. This clear filter simply keeps the optical properties of the lens, as it has the same thickness as the colour filters.

Ben
08-04-2009, 09:04 AM   #3
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Original Poster
QuoteOriginally posted by Ben_Edict Quote
I expect the 17mm to work the same as my 16mm Fisheye or almost any other lens with internal filters.

The filters are quite small, just enough diameter to cover the internal lenses near the aperture, where the lenses have the smallest diameter (usually). So they are packed in a larger filter wheel, which can be rotated from the outside via the filter selector. One of the filters is either clear glass (UV filter) or a Skylight and should be used, when no colour filter is selected. This clear filter simply keeps the optical properties of the lens, as it has the same thickness as the colour filters.

Ben
Thanks Ben. That explains it quite succinctly.
08-04-2009, 11:04 AM   #4
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In addition to what Ben said about the built in filters.

The AorK15/3.5, A16/2.8 Fish-eye, K18/3.5 & K28/3.5 Shift lenses have a filter ring on the lens you turn like the aperture ring.

The K17/4 fish-eye which is the same design as the M42 version, has a filter dial on the top of the lens, between the element and the tiny built in hood. It’s a bit of a pain turning, but otherwise it’s a great little lens.

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