Archived posting to the Leica Users Group, 2010/04/24
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Do these have the same vulnerable outside threads that the Tri-Elmar 16-18-21mm has? Is there some kind of cover that protects the threads when the hood is off (the Tri-Elmar uses the hood for that purpose)? Of course, the idea may be to leave it permanently mounted (which is curious - I never get flare with my current ASPH, using no hood). I'm also having a hard time understanding why a threaded metal hood is more efficient; it's ineffcient to sit there threading a hood on (the current 35 ASPH hood has a lock ring, so it's marginally better), and the manufacturing efficiency has never to date been an issue for Leica. As for substantiality... I know that there is an ethic in German industrial design that metal/heavy=high quality, but I am not sure why from a functional or mechanical standpoint metal would be more attractive than plastic. Metal dents, it wears poorly, and it transmits mechanical shock into the lens very efficiently. And it blocks stray light no better than plastic does. I thought that the greatest achievement in Leica hood design was the 12585 (35mm Summicron v4) and the equivalent for the pre-ASPH 35 Summilux, both of which were superbly engineered and made. The one for the (now penultimate generation) ASPH Summilux is very nice, though not quite as convenient due to the locking ring. But maybe the reason why this new hood gives me the creeps is that it looks a little bit like the rubber(?) hoods that go with Soviet Jupiter-3 lenses: http://pic100.picturetrail.com/VOL740/2933453/22048104/368930854.jpg Dante NO ARCHIVE On Apr 22, 2010, at 8:17 AM, Geoff Hopkinson wrote: > Frank the new external thread metal lens hoods have been used on the new > 18, > the new 21 and both the new 24's. The designs are more compact/efficient > and > they are all metal instead of plastic. Much more robust and you can fit > filters inside them if desired. Generic hoods that fit the filter threads > are obviously still an option (but the new ones are included with the > lenses > anyway). For the cheaper Summarits you pay extra for the hoods. So every > new > Leica M design has a screw on metal hood since the introduction of the > Summarits (except the Noctilux). I know that some current ZM designs have > bayonet on hoods, I don't think that is a common method for modern Leica M > lenses? None that I know about anyway. > > You know that the Aspheric elements don't 'float' and they are not related > to 'back focus' right? The floating elements do improve close in > performance > and I think minimise focus shift as you stop down, I 'd stand correction on > that last. > The superb Summilux 50 ASPH. and APO Summicrom 75 ASPH. that I have both > use > this and I think were the earlier implementation of this technology. Peter > Karbe and his team shoud be venerated as optical Dieties! > > Cheers > Geoff > http://www.pbase.com/hoppyman > > > On 22 April 2010 15:30, Frank Filippone <red735i at earthlink.net> wrote: > >> And the lens has a screw on lens hood...... This is a pretty big change >> for >> Leica..... for a long time, they have all bayoneted on..... ( exception >> being the WATE, and the Summarits.. and maybe others I do not know ) >> >> about.....) >> >> >> Frank Filippone >> red735i at earthlink.net >> >> >> >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information >> > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information