From: Miserere
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.
The front element in the first image looked like it had significant
curvature, almost like a fish-eye. Probably requires a special lens cap
so it doesn't rub in the center.
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