Juan J. Buhler wrote>> Does this 17mm have provision for back filters? If
so, make sure you're using one, at least the UV one. Back filters are part
of the optical design, and are not optional as filters you mount on the fron
of a lens. The way you describe it it sounds like you're missing it...<<
Well, yes and no...
Yes, the lens has a provision for gelatin filters via the use of the
provided holder that is threaded to the rear of the lens.
No, it is not required for sharp focus at infinity. This lens is sold
without any such proviso. There may be lenses that do require a filter
element as you described, but this is not one of those. The filters are
built in, at least a UV, O2, and Y2.
The Pentax Lens Operating manual from Asahi gives no special instructions
for the lens beyond proper use of the internal filter, and provision for
gelatin filters.
The lens in question, in my first-hand experience, is sharp without
additional filters, and focuses correctly as any other lens would.
ppro
-
This message is from the Pentax-Discuss Mail List. To unsubscribe,
go to http://www.pdml.net and follow the directions. Don't forget to
visit the Pentax Users' Gallery at http://pug.komkon.org .
