On 5 Oct 2003 at 11:14, Henry Posner wrote: > At 05:58 PM 10/4/2003 +0200, EOS-Digest wrote: > > >http://www.sigmaphoto.com/Html/12-24.htm > > > >My concerns are: > >- -non-removable hood > >- -no screw in filter possible > >- -non HSM (FTM) > >- -6 diaphragm blades > > I understand your concerns, but this is pretty much SOP for ultra wide > angle or fisheye lenses. In most cases you couldn't add a front filter > 'cause the angle of coverage is so wide any filter would vignette. > Since the depth of field of most fisheyes is almost from the front > element to the Moon, manual focus override also is not really > necessary. -- -
But manual pre-focus is, to speed up AF (or avoid the visible red focus-patterns from the flash), and even more so to avoid hunting for focus....both arguments are more relevant with telelenses of course, but still convenient with shorter focal lengths. That said, according to their site, it *is* HSM.... http://www.sigmaphoto.com/Html/12-24.htm (just not for MAF & PAF) Btw, it *is* possible to mount a thin piece of polaroid in/under that rear filter slot. I have been doing this since I owned the old-style Sigma 8mm/f3.5 (internal screw filter, lens would dismount in 2 parts to give access to the filter), then expanded application to a swing lens panorama camera, and last year I even succeeded with the new-style Sigma 8mm/f3.5, by dismounting the upper part of the filter slot, inserting the filter, and tightening the screws. And yes, this is a circular polarizer....:)) (that's why it is much thicker than normal gelatine, and also thicker than a linear polarizer (which I do use in my panorama camera btw)) Of course, it's *much* easier with a circular fisheye to adjust the polarizer....simply rotate the camera....:)) -- Bye, Willem-Jan Markerink The desire to understand is sometimes far less intelligent than the inability to understand <[EMAIL PROTECTED]> [note: 'a-one' & 'en-el'!] * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
