On 11 March 2010 15:33, Mark Roberts <[email protected]> wrote:
>
> It's a lens with a internal removable/interchangeable filter. The knob
> is how you secure it once it's in place. The "Front" marking just
> shows which way the filter drawer goes in. Most commonly found on big
> telephoto lenses like my FA*300/2.8. In this case it appears to be on
> a wide angle (presumably the front element is too big to use
> conventional filters without vignetting).
I knew I could count on the collective Geek IQ of PDML to sort this
one out. It makes sense what y'all are saying, and I suppose this
means Pentax will release something wider than the famous FA645 35mm.
Not owning any exotic lenses, these knobs were completely alien to me.
--M.
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