Archived posting to the Leica Users Group, 2012/10/17
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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 >