500f/4 mirror ? I'd be heaviliy suprised of a F/4 mirror lens. Those are usually 500/600mm f/8 or 300/350mm f/5.6.
On Nov 15, 2007 1:54 PM, <[EMAIL PROTECTED]> wrote: > I do have a Simga 500mm F.4.0 mirror lens, which is sort of heavy and I do > like it. > Here is a link to to a photo of it on my photo.net page.There are three > photos of it on that page....Joe > > http://photo.net/photodb/photo?photo_id=5771640 > > > > -------------- Original message ---------------------- > From: Thibouille <[EMAIL PROTECTED]> > > I think mirror lens have the realyl advantages (well more or less) of being: > > > > * portable (but a bit too much, they are too lightweight for the focal > > length IMO and as such difficult to stabilize). In the end you still > > need a tripod which kinda negates the argument. > > > > * cheap. and I think this is the major point why people buy those. I > > have one although I didn't pay for it (long term loan ;) I'm sometimes > > very happy having it. I know I will *never* be able to pay for > > "proper" 500mm lens. so I'm happy with my Tamron. > > > > True the bokeh is indeed very problematic. But as a chgeap astro lens > > like moonshots (at least for a newbie like me) I think it is a very > > acceptable solution... not without obvious drawbacks. > > > > -- > > Thibault Massart aka Thibouille > > ---------------------- > > K10D,Z1,SuperA,KX,MX, P30t and KR-10x ;) ... > > > > > -- > > PDML Pentax-Discuss Mail List > > [email protected] > > http://pdml.net/mailman/listinfo/pdml_pdml.net > > to UNSUBSCRIBE from the PDML, please visit the link directly above and > > follow > > the directions. > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- Thibault Massart aka Thibouille ---------------------- Photo: K10D,Z1,SuperA,KX,MX, P30t and KR-10x ;) ... Thinkpad: X23+UB,X60+UB Programing: D7 user (trying out D2007) -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
