f/0.95

[Bob_Defly]

You guys seen this, it's ridiculous!

http://en.wikipedia.org/wiki/Image:Canon_7_with_50...



I didn't even know you could go below f/1?

(damn, won't let me hotlink)

Edited by Bob_Defly on Tuesday 20th May 17:51

[Simpo Two]

Hah, Mr Brett only has a really slow f1.0

Is there a theoretical maximum f?

[ThatPhilBrettGuy]

Simpo Two said:

Is there a theoretical maximum f?

Not really, although as you can imagine for the same size target film (eg 35mm) and the same focal length it gets MUCH harder to build.

There's a F/0.7 that I think NASA made and I think was used in a film?

That f/0.95 is a great lens but won't fit on any of todays SLR's and is actually more like f/1.05 due to transmission losses. The later lenses had better coatings and the tranmission losses were much smaller.

[Felters]

apparently about 0.5...

http://photography-on-the.net/forum/archive/index....

Edit to add I've got a Nikkor 50mm f1.4 and I did try it at max aperture once... the results weren't great. Anything below F2 on it gives such a narrow depth of field that it's effectively unusable. It's a cracking lens for informal portraits though.

Edited by Felters on Tuesday 20th May 22:02

Edited by Felters on Tuesday 20th May 22:04

[Bob_Defly]

My 50mm 1.8 isn't sharp until about 2.2+

[VxDuncan]

ThatPhilBrettGuy said:

There's a F/0.7 that I think NASA made and I think was used in a film?

That'll be Kubricks Barry Lyndon - he used an adapted ex NASA ziess F0.7 lens for the interior shots. Bought it on dvd purely for these scenes, but being a Kubrick film, I haven't free'd up 3 hrs to watch it yet!

[quote]That f/0.95 is a great lens but won't fit on any of todays SLR's and is actually more like f/1.05 due to transmission losses. The later lenses had better coatings and the tranmission losses were much smaller.

Technically the f number is focal length / max apperture of lens, so losses are not taken into account - a decent multicoated optic at f1.8 could produce more light than a dim f1 lens, but they would still be f1.8 and f1.

[Podie]

Simpo Two said:

Hah, Mr Brett only has a really slow f1.0

You heard the amusing tale of what happened when he came to buy it?

[Andy M]

There's a Zeiss 50mm ƒ/0.7

[Simpo Two]

VxDuncan said:

That'll be Kubricks Barry Lyndon - he used an adapted ex NASA ziess F0.7 lens for the interior shots. Bought it on dvd purely for these scenes

It never pays to read technical things before the first cup of coffee. I read the above as saying you got that ex-NASA Zeiss f0.7 lens on eBay purely for those scenes...

And no, I haven't heard what happened with TPBG but I suspect we will now