Archived posting to the Leica Users Group, 2012/10/17
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Sorry, Richard, I saw the earlier post on the Nikkor and that stuck. The Fuji f/4.5 is just about the same as the Nikkor f/4.5; both are older designs from the early 70's similar to the Grandagon and the SA 90/5.6. Not all that good until f/16, and then they have very good and even performance. As far as checking, you have to find someone who has a good optical bench and knows what he's doing. There was someone here in Vancouver until the late 90's who did that for me, but I don't know anyone who does that now. Do you have a 4x5 camera or a camera with a good 6x6 or 6x7 back you can check this lens on? Those would be better than a 6x17 back. The film flatness problem with 6x17 is quite severe, from what I've heard. For a number of Photokinas we stayed at the same hotel as Ken Canham, and he was trying, reasonably successfully, to make the first 'flatter' 6x17 back. Not having tried any, I had to take his word for it. I'm not sure Shenhao got it right; Ken didn't think so. Henning On 2012-10-17, at 12:17 AM, Richard Man wrote: > 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> > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information > Henning Wulff henningw at archiphoto.com