Uwe_Nds
Chief Assistant Driver
kram
Well-known
I thought it was 1/4th of a stop. f1 to f1.4 1 stop. f1 to f1.2 1/2 stop, same as f1.2 to f1.4 half a stop. Square of 1 is 1, square of 1.4 is 1.96(2) square of 1.2 is 1.44 (1.5), square of 1.1 ia 1.21 (1.25). In other words 1/4 stop slower than the f1.0 - no big deal. And morre important to me 11/12ths of a stop greater than my f1.5.
gdi
Veteran
That is so true, the subject matter makes all the difference. You see smooth bokeh from the Noctilux and you also see vertiginous messes from it. In particular, near complex backgrounds with specular highlights or splotchy lighting can create a swirly uneven look.
2 Canon shots - same day/lens/aperture...
Karefin
Member
Let alone the Heliar 50/3,5 collapsed. But this lens doesn't seem to have similar attributes.
john_s
Well-known
The exact mathematics of this is probably moot given that the aperture figure might well be significantly rounded off. When apertures are really accurately measured they are often noticeably different numbers to the stated aperture even though exposure-wise the difference is really small. FWIW the progression of quarter stops from 1 to 1.4 (theoretically 1.414):
1
1.09
1.18
1.30
1.41
and the progression of 1/3 stops is:
1
1.12
1.26
1.41
So at this stage the new CV lens could just as easily be 1/4 or 1/3 stop off f1. This is in the field centre of course. The VC lens apparently shows less vignetting than the f1 Noctilux so is in effect closer to f1 across the useful part of the frame than the aperture figures would suggest.
In fact, if the actual true aperture were f1.149 (smallest number that one could be justified in rounding to f1.1), it would be 0.4 stop smaller than f1.
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The actual measured F-Stop of the Olympus 50mm F1.2 SLR lens for the OM is F1.3. The 55mm F1.2 Nikkor and 50mm F1.2 Noctilux measured to be F1.2, as per my 1976 Pop Photo tests. Other lenses varied by as much as 0.1stop over the claimed rating. Some marked F1.4 lenses are actually measured as F1.49, which sounds a little close to F1.5 in my book.
I think it is fair to state that F1.1 is about 1/4 stop slower than F1 and 1/3rd stop slower than F0.95. F1.0 to F0.95 is about 1/6th of a stop.
I think it is fair to state that F1.1 is about 1/4 stop slower than F1 and 1/3rd stop slower than F0.95. F1.0 to F0.95 is about 1/6th of a stop.
newsgrunt
Well-known
this shot is unbelieveable ! I love it !
john_s
Well-known
this shot is unbelieveable ! I love it ![/quote]
This does take bokeh into a completely different realm!
kram
Well-known
Thanks for the further info Brian and John_s. It will be interesting to see the price and uptake of this lens when it comes to the UK.
cnguyen
Established
Any chance of new Voight lenses to have factory 6 bit coding for Leica ?
yoyo22
Well-known
Since Leica got a patent on the coding, I doubt it will be factory coded anytime soon. Anyways, what code would you put on it? The one of the old Noctilux which seems to have significantly more vignetting and different colour rendition? Might not be the best choice. And CV will never be able to make Leica include their very own Nokton corrections into the firmware of the M8. Hell will freeze over before that happens.
Sonnar2
Well-known
I would like to see a silver one here because from my experience the silver keeps better with C/V lenses.
Another great coup of Cosina/Voigtlaender to stay in the headlines. It will bring down the current hype prices of the 50/0.95 Canon to some extend.
Would like to see larger pictures of it, and in color too.
My experience with the Canon 50/0.95 wasn't as bad either, at 500x350 pixel it's sharp at least. At f/2.8 it is really sharp - as the 50/1.4.
I wonder how the lens diagram may look like. 7/6 sounds like a quite simple classical Gaussian (extended Ultron) design. No aspherical elements?
With 58mm filter the size should be reasonable compact, about a Noctilux (which never was a true f/1.0 lens either). But at least it's announced with f/1.1, so if it's f/1.2 in reality it's quite "close" (most f/1.2 lenses weren't true f/1.2's either)
Alas, I hope they'll make a compact 50/3.5 or 2.8 hiker lens next, apochromatic and with no need to close down to f/8 for landscapes. Sharp as the new ASPH.-Summilux but 2-2,5 stops slower. Shouldn't be that difficult and expensive. Would be more important for most people like me. And SCREWMOUNT, again, please. The Bessa-R is still my most important camera for hiking, biking... mainly for smaller size of lenses. Even the lens caps don't need that unnecessary space...
Another great coup of Cosina/Voigtlaender to stay in the headlines. It will bring down the current hype prices of the 50/0.95 Canon to some extend.
Would like to see larger pictures of it, and in color too.
My experience with the Canon 50/0.95 wasn't as bad either, at 500x350 pixel it's sharp at least. At f/2.8 it is really sharp - as the 50/1.4.
I wonder how the lens diagram may look like. 7/6 sounds like a quite simple classical Gaussian (extended Ultron) design. No aspherical elements?
With 58mm filter the size should be reasonable compact, about a Noctilux (which never was a true f/1.0 lens either). But at least it's announced with f/1.1, so if it's f/1.2 in reality it's quite "close" (most f/1.2 lenses weren't true f/1.2's either)
Alas, I hope they'll make a compact 50/3.5 or 2.8 hiker lens next, apochromatic and with no need to close down to f/8 for landscapes. Sharp as the new ASPH.-Summilux but 2-2,5 stops slower. Shouldn't be that difficult and expensive. Would be more important for most people like me. And SCREWMOUNT, again, please. The Bessa-R is still my most important camera for hiking, biking... mainly for smaller size of lenses. Even the lens caps don't need that unnecessary space...
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maddoc
... likes film again.
Despite strong vignetting in the corners (about ~ 1.5 to 2 stops) the Noctilux is a true f/1.0 lens. (As reported by E. Puts here)
alan davus
Well-known
Alas, I hope they'll make a compact 50/3.5 or 2.8 hiker lens next, apochromatic and with no need to close down to f/8 for landscapes. Sharp as the new ASPH.-Summilux but 2-2,5 stops slower. Shouldn't be that difficult and expensive. Would be more important for most people like me. And SCREWMOUNT, again, please. The Bessa-R is still my most important camera for hiking, biking... mainly for smaller size of lenses. Even the lens caps don't need that unnecessary space...[/QUOTE]
Hex 50 2.4 LTM collapsible??
Hex 50 2.4 LTM collapsible??
gdi
Veteran
noimmunity
scratch my niche
Me too. But I think it won't happen for a while, if at all.
That's what I asked for in the original thread. But I bet CV makes a 25/2 first.
Sonnar2
Well-known
That's why the Canon 50/0.95 had 72mm filter: to avoid light falloff to the corners. That's what I call a "true" f/1 lens. It's the more difficult task for the optical designer as well, because flare and many aberrations occur in addition with the large glass. Limiting glass diameter is the easiest way how to "control" things (well known since the 1930's Summar)
Pickett Wilson
Veteran
Yes! A 50 3.5 APO would be great. I guess the money is in exotic, but this would be truly useful.
Sonnar2
Well-known
Oskar Barnack would be with us 
And please make it deeper collapsible than the 50/2.0 Heliar... and screwmount.
And please make it deeper collapsible than the 50/2.0 Heliar... and screwmount.
Palaeoboy
Joel Matherson
Um.... Cosina already made such a lens, the Heliar 50mm f3.5. I believe it to be the finest Voigtlander lens yet made. I know some will chime in and mention that the lens was only available in the 101 Anniversary kit but there were 2000 of these made and alot have been separated from the camera bodies by now. If your really need this lens, with a little patience, you will get one in the end.