[Leica] R10? That's so pedestrian... Info on 28/2.8 still wanted...

[henningw at archiphoto.com (Henning Wulff)]

The image circle is at least 63mm diameter. What the quality is like 
at the edges, I don't know. The image circle is enough for the Xpan 
probably, as it's a bit bigger than that of the Nikkor 28/3.5PC. 
There might be a problem though with the location of the rear exit 
pupil, as the lens is designed for an SLR. You might well get 
vignetting as the Xpan throat is not all that large, and an exit 
pupil far from the film plane might be cut into by that throat. A RF 
coupled mount has to be very carefully designed and manufactured not 
to cut further into this throat. You'll probably get vignetting. The 
28/3.5 PC Nikkor has this problem, and is thus not fully useable on 
the Xpan. The Nikkor is also definitely lacking in the quality 
department compared with the 30 Xpan lens. The Xpan lens may be slow, 
but it works. No point in using the larger Xpan film area if the 
quality isn't that good.

At 12:46 PM -0800 1/24/08, Richard Man wrote:
>Someone speculates that my wish for info on the image circle size 
>for the 28/2.8 is may be for the fabled R10.... Nah, so if you have 
>the info, I'd much appreciate it if you can let me know!
>
>As for why. Herein lies a tale, or tail... All photos Neopan 1600 
>souped in Harvey 777. Who says Film is Dead?
>
>First, an image made with the Summicron 50 R:
>http://www.dragonsgate.net/pub/richard/PICS/Scan-080124-0012.jpg
>
>Big deal, motion blur blah blah blah, but what if I say the 
>Summicron is scale focused?
>
>Surely that's stupid, and it is. It's a test really. Here's at F2, 
>picture no great shake, but at least one eye is sharp as tack:
>http://www.dragonsgate.net/pub/richard/PICS/Scan-080124-0004.jpg
>
>But seriously, who would want to scale focus a R lens? No one for sure, 
>but...
>
>I can get really close:
>http://www.dragonsgate.net/pub/richard/PICS/Scan-080124-0022.jpg
>
>The 'cron gives nice tonesI think it's the 777 at work. The 'cron is 
>cheap too, compared to the M lens. I bought it from KEH for $249 and 
>it looks pretty "mint" to me. Much bigger than the M lens though.
>
>Anyway, if you read this far and have not gone away with 
>un-interest, perhaps the format gives a little hint on what I am 
>trying to do. Here are two more hints:
>
>Mid distance:
>http://www.dragonsgate.net/pub/richard/PICS/Scan-080124-0024.jpg
>
>Far:
>http://www.dragonsgate.net/pub/richard/PICS/Scan-080124-0021.jpg
>
>Interesting that vignetting only happen on medium to far distance, 
>but close up is fine, although still not covering the full format.
>
>To shorten the, um, tale, my ultimate goal is to adapt the 28/2.8 PC 
>(if needed be) to the XPan WITH RF-focusing. Why not just use the 
>Fuji/Hassy 30mm? I have the 30mm, and it's very good and all but 
>it's F5.6 and more like F9-F11 when the center filter is used (which 
>is highly recommended). If I can get the 28/2.8 to work, I am 4 
>stops ahead.
>
>After 6-8 months of pestering many people, I have finally gotten a 
>shop (which specializes in this sort of things) to see if they can 
>build a RF CAM. The 50 Summicron is for a prototype to see if the 
>idea can be made to work. I am pleasantly surprised that, as some of 
>you wrote earlier, that the 50/2 has a rather large image circle, 
>75% or so of the XPan requirement. I know for sure that the 28 PC's 
>image circle is large enough, but it would be even sweeter if the 
>Elmarit's image circle is large enough as it is a much smaller lens. 
>I sort of doubt it, but one can hope and dream!
>
>I also understand that the 28 PC is really a Schneider lens, so if I 
>go down that route, I'd probably find a non-mounted version and have 
>the machine shop build a custom mount... We will see..
>
>// richard (This email is for mailing lists. To reach me directly, 
>please use richard at imagecraft.com)
>
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    *            Henning J. Wulff
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