Archived posting to the Leica Users Group, 2012/10/17
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Henning, as I amended, it's a Fuji SWD and not a Nikkor. So how do I check if the spacing is correct? This pages talks about lens mounting a bit, but no method on checking: http://lensn2shutter.com/lensmounting.html Again, more (rigorous) tests tomorrow. Thanks On Wed, Oct 17, 2012 at 12:04 AM, Henning Wulff <henningw at archiphoto.com>wrote: > While the 617 holders have more problems with film flatness, the lens does > come into play as well. Which Nikkor 90 is it; the f/8 or the f/4.5? The > f/8 is a little sharper in my experience at f/11. While quite decent, they > are not quite up to the standard of the newer lenses like the SA-XL line or > especially the Super-Symmar XL. In practice this is extremely hard to see > if you are shooting at f/16 and smaller. I have some SA-XL lenses and the > 47 is actually a little sharper than the T* Biogon in my SWC as is my 35 > Apo-Grandagon at f/8. At f/4.5 the Biogon is sharper overall, and at f/11 > you can't tell the difference. In practice, the SWC usually produces > sharper pictures because my best roll film back (6x7) doesn't hold film as > flat as the Hasselblad backs. But the 47 covers 4x5, and the 35 covers > 6x12. > > Also, make sure the 90 Nikkor is mounted correctly. About half the LF > lenses I have were mounted with incorrect spacing between the front and > back cells. All lenses I obtained through Sinar or that were originally > sold by Sinar or Linhof were mounted correctly; my Nikkors from Nikon in > Copal shutters (3) were all mounted out of tolerance and had improved > performance after adjustment. > > Henning > > > > On 2012-10-16, at 10:36 PM, Richard Man wrote: > > > The Shenhao 617 holder. There have been talk about 617 holders (not just > > Shenhao's) do not keep the film flat enough :-( > > > > On Tue, Oct 16, 2012 at 10:22 PM, Frank Filippone <red735i at verizon.net > >wrote: > > > >> the lens will cover the format.........and it is pretty modern, so it > >> should > >> be pretty sharp. > >> > >> The image circle of the 90 Nikkor SWD is 238mm. > >> The 6x17 format has a diagonal of 180mm. > >> > >> Back to the questions about film flatness.... and "floppiness" in the > >> camera... The SWC is exceptional in this regard..... > >> > >> What film "holder" are you using? > >> > >> Frank Filippone > >> Red735i at verizon.net > >> > >> > >> -----Original Message----- > >> From: lug-bounces+red735i=verizon.net at leica-users.org > >> [mailto:lug-bounces+red735i=verizon.net at leica-users.org] On Behalf Of > >> Richard Man > >> Sent: Tuesday, October 16, 2012 10:08 PM > >> To: Leica Users Group > >> Subject: Re: [Leica] OT: large format lens vs. medium format lens > >> > >> Mainly the Nikkor 90mm SWD, but I think the other lens are similar... > >> > >> On Tue, Oct 16, 2012 at 10:02 PM, Frank Filippone > >> <red735i at verizon.net>wrote: > >> > >>> Film flatness plays its part.... > >>> Your lens is trying to project an image circle equivalent to a 5x7 > >>> negative area....not an easy task.... > >>> > >>> What lens are you using? > >>> > >>> Frank Filippone > >>> Red735i at verizon.net > >>> > >>> Always been my understanding of it, not the same enlargement so not > >>> the same lens resolving. Newer LF lenses are much better than most old > >>> ones though.... > >>> > >>> john > >>> > >>> -----Original Message----- > >>> > >>> As Iwas formulating the question, it sounds like the answer IS > >>> obvious, but just want to confirm. > >>> > >>> I am testing the Shenhao 617 and it could be my focusing techniques > >>> and other issues, but it appears to me that the images are not as > >>> sharp on the same film as images made by, well, the Hassy SWC. > >>> > >>> Yes, I am expecting someone to jump in and say of course the SWC is > >>> razor sharp because it's the legendary Biogon etc., but I am now > >>> thinking that this generally will be the case, as the large format > >>> lens are designed to cover large negative (and the smallest 4x5 dwarfs > >>> the 617) so they do not generally have the resolution and sharpness > >>> that a good medium format lens has. > >>> > >>> Is this correct? > >>> > >>> -- > >>> // richard <http://www.richardmanphoto.com> > >>> > >>> > >>> _______________________________________________ > >>> 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 > >>> > >> > >> > >> > >> -- > >> // richard <http://www.richardmanphoto.com> > >> > >> _______________________________________________ > >> 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 > >> > > > > > > > > -- > > // richard <http://www.richardmanphoto.com> > > > > _______________________________________________ > > 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 > -- // richard <http://www.richardmanphoto.com>