Benjamin Marks
Veteran
In real world terms you won't notice a couple tenths of a stop difference, and there are other impacts (number of air surfaces, number of glass surfaces, type and efficiency of lens coating, even your film-development routine) that will have enough of an effect on how much light reaches the film and how the images form that they may mask any tenth-of-a-stop markings on the barrel. For a good run-down of the maths/myths on superfast glass (T-stops, the whole loga-funky-rhythmic deal), Dante Stella has a nice write up here: http://www.dantestella.com/technical/fast.html.
The exciting thing about the announcement to me is that once again, the RF-friendly folks at Cosina have, courtesy of Mr. K., enlarged photo-possibilities by producing a modern super speed lens that need not break as many bank accounts a the Nocti-monster. Folks will be excited. They will take pictures. They will post photos of the candle-sticks on their dining room tables and of messy-bokeh making forsythia plants in their back yards. They will debate the relative merits of the Canon 50/0.95, the 50/1.2, the Nocktilux, cropping the 35/1.2's images and so on. But at the end of the day, we will have more tools at our disposal.
Yay!
Ben Marks
P.s. F:1.1 and be there!
The exciting thing about the announcement to me is that once again, the RF-friendly folks at Cosina have, courtesy of Mr. K., enlarged photo-possibilities by producing a modern super speed lens that need not break as many bank accounts a the Nocti-monster. Folks will be excited. They will take pictures. They will post photos of the candle-sticks on their dining room tables and of messy-bokeh making forsythia plants in their back yards. They will debate the relative merits of the Canon 50/0.95, the 50/1.2, the Nocktilux, cropping the 35/1.2's images and so on. But at the end of the day, we will have more tools at our disposal.
Yay!
Ben Marks
P.s. F:1.1 and be there!
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ferider
Veteran
Should be if you have a reference lens. Using histograms in PS or directly in camera.
Sparrow
Veteran
A spot meter reading directly off at a target then a second of the same target taken at the film plane through the lens would yield two numbers to play with, some calc would be needed for the FOV of the meter… I think
Al Kaplan
Veteran
There are numerous reasons that M.P. lenses are T-stopped. Zoom lenses with a 20:1 focal lenth range have a LOT of elements eating up lots of light for one. Another is that when you use several different lenses to shoot a scene you want all of the negatives to be the same density. They still have marked f-stops because they're used to determine depth of field.
The Canon 0.95 was designed to fit the outer bayonet of the Canon 7 rather than the internal thread mount. The Leica M bayonet is a couple of mm larger in diameter than the Leica/Canon thread mount. The rear of the lens, where it extends into the camera, isn't round. It's flattened on top to make room for the rangefinder roller. The lens couldn't do a 360 degree rotation to fit a thread mount. Even the M conversion is a tight fit.
Finally, M.P. lenses don't have to cover the full 18x24 of the old silent film cameras. In order to leave room for an optical sound track on the film the industry standard is the "Academy Aperture", which is a bit smaller.
Zeiss and Angenieux also make lenses faster than f/1 in a variety of focal lengths. Lucky for the lensmakers that nobody blows up the frames to 20x24 and squints at them with an 8X magnifier
The Canon 0.95 was designed to fit the outer bayonet of the Canon 7 rather than the internal thread mount. The Leica M bayonet is a couple of mm larger in diameter than the Leica/Canon thread mount. The rear of the lens, where it extends into the camera, isn't round. It's flattened on top to make room for the rangefinder roller. The lens couldn't do a 360 degree rotation to fit a thread mount. Even the M conversion is a tight fit.
Finally, M.P. lenses don't have to cover the full 18x24 of the old silent film cameras. In order to leave room for an optical sound track on the film the industry standard is the "Academy Aperture", which is a bit smaller.
Zeiss and Angenieux also make lenses faster than f/1 in a variety of focal lengths. Lucky for the lensmakers that nobody blows up the frames to 20x24 and squints at them with an 8X magnifier
rogue_designer
Reciprocity Failure
1.1 means you can stop down to 1.2 
Not many lenses can lay claim to that!
Not many lenses can lay claim to that!georgl
Member
I think it's because motion picture equipment is a professional market, very little is driven by marketing and cinematographers prefer a precise speed-value on their lenses.
By the way, some of the newest motion-picture-lenses are unbelieveable high-speed designs, the Zeiss Master Primes are f1.2 (or T1.3) from 14mm up to 150mm! And their performance at T1.3 is better than most still photography lenses stopped down... Ok, and they cost more than 10k€ each...
All modern (spherical) M.P.-lenses cover full 18x24mm, since 24mm wide Super35 is the standard (besides anamorphic).
Hopefully f1.1 on the new Cosina is usable, I haven't been very excited about their "cost-effective" designs/manufacturings, especially with demanding lenses (f1.1 is VERY demanding), otherwise they should rather make it a bit slower and make it right or invest more into design/manufacturing...
But unless they don't print "Zeiss" on it I'm fine with a little bit less perfectionized lenses for the M-lenses as an "entry-drug".
By the way, some of the newest motion-picture-lenses are unbelieveable high-speed designs, the Zeiss Master Primes are f1.2 (or T1.3) from 14mm up to 150mm! And their performance at T1.3 is better than most still photography lenses stopped down... Ok, and they cost more than 10k€ each...
All modern (spherical) M.P.-lenses cover full 18x24mm, since 24mm wide Super35 is the standard (besides anamorphic).
Hopefully f1.1 on the new Cosina is usable, I haven't been very excited about their "cost-effective" designs/manufacturings, especially with demanding lenses (f1.1 is VERY demanding), otherwise they should rather make it a bit slower and make it right or invest more into design/manufacturing...
But unless they don't print "Zeiss" on it I'm fine with a little bit less perfectionized lenses for the M-lenses as an "entry-drug".
kross
sonnarism
Ben, i fully agree with you and i'm gonna be there at f1.1!
i want to break "my personal light speed barrier" record
as i'm sick and tired of "traveling" at f1.2....
and hopefully by the time i'm sick and tired of "traveling" at f1.1,
cv releases yet another affordable sub f1.1 lens...