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Ultra-Fast Lenses (1)

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Post Options Post Options   Quote Coast Quote  Post ReplyReply Direct Link To This Post Posted: 13 December 2018 at 04:54
f/1.1 50mm

the Bridge, the Bay, the boat and the Port
by /photos/purple-bullet/Coast
 



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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 20 October 2018 at 21:14
Autumn leaves


A7ii + Nokton 35/1.2 II @ f1.2
You can see the April Foolishness 2023 exhibition here Another great show of the talent we have on Dyxum
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Post Options Post Options   Quote rovhazman Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 2018 at 18:45
OK, I took my 35/1.2 out again...

Hibiscus

Sony ILCE-7RM2 + Voigtlander Nokton Aspherical 35mm F1.2 II | ISO 200 | f/1.2 | 1/1250 sec

And for Coast - one of Ron (the baby from page 1) from today...

"Daddy, not again!!"

Sony ILCE-7RM2 + Voigtlander Nokton Aspherical 35mm F1.2 II | ISO 200 | f/1.2 | 1/3200 sec
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Post Options Post Options   Quote rovhazman Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2018 at 07:37
Originally posted by QuietOC QuietOC wrote:

Originally posted by rovhazman rovhazman wrote:

maybe even f/1.4 lens with turbo adapter...)

While that makes an ~f/1 APS-C lens the combination doesn't even look as fast as the f/1.4 lens looks on full-frame. F/1.8 lenses also become f/1.3 APS-C lens on a focal reducer. This thread should probably stay uncluttered with focal reduced lenses on APS-C unless the original lens was already faster than f/1.4.

There are really no ultra fast lenses for APS-C. There are several f/0.95 options, but those also look slower on APS-C than f/1.4 lenses look on full-frame.


The cut off of f/1.2 is totally arbitrary and, as I said in the beginning of this thread, there is no much different between f/1.2 and f/1.4, especially if you mix FF and APS-C (note that when the thread started a FF E-mount camera was only a wishful thinking...).

The definition of ultra-fast lens in this thread is not by depth of focus or the physical aperture opening - if that was the definition, 300/2.8 has shallower DoF and larger aperture than 35/1.2...

To make it simple, we defined the eligible lenses by the effective F number from the exposure point of view - f/1 on APS-C gives you longer exposure time than f/1.4 on FF (for a given scene and a fixed ISO). Therefore, f/1 is faster than f/1.4, regardless the sensor format. And following this logic, the turbo adapter allows shorter exposure time...
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Post Options Post Options   Quote waldo_posth Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2018 at 12:41
Originally posted by QuietOC QuietOC wrote:

...

There are really no ultra fast lenses for APS-C. ...


I am puzzled. Josef's (Coast) Kamlan lens is APS-C. Samyang offers two F/1.2 manual focus APS-C lenses - a 35mm and a 50mm lens. I am sure there are even more.
"Stare, pry, listen, eavesdrop. Die knowing something. You are not here long." (Walker Evans)   http://www.flickr.com/photos/waldo_posth/
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2018 at 12:00
Originally posted by rovhazman rovhazman wrote:

maybe even f/1.4 lens with turbo adapter...)

While that makes an ~f/1 APS-C lens the combination doesn't even look as fast as the f/1.4 lens looks on full-frame. F/1.8 lenses also become f/1.3 APS-C lens on a focal reducer. This thread should probably stay uncluttered with focal reduced lenses on APS-C unless the original lens was already faster than f/1.4.

There are really no ultra fast lenses for APS-C. There are several f/0.95 options, but those also look slower on APS-C than f/1.4 lenses look on full-frame.

Edited by QuietOC - 08 May 2018 at 12:11
Sony A7RIV LA-EA5
Pentax Q7 5-15 15-45/2.8 8.5/1.9 11.5/9
 



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Post Options Post Options   Quote Mark_k Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2018 at 11:43
Mark K A99II A7IV, A77, A6400, A1
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Post Options Post Options   Quote Mark_k Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2018 at 11:42
My limited time with a pair of 0.85 prime lenses were so precious. The hand made 25f20.85 and 40f2.5 workd OK for my A6K

[IMG]https://c1.staticflickr.com/1/941/41542143622_88acb984c4_b.jpg[/IMG
]
Mark K A99II A7IV, A77, A6400, A1
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Post Options Post Options   Quote rovhazman Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2018 at 07:37
Thank you, Coast!

On page 5 you can find a picture of Ron from 1 year ago (last photo on this post)... I will look for even more updated photos...
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Post Options Post Options   Quote Coast Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2018 at 07:26
👍 Cute baby, wonder what he looks like now
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Post Options Post Options   Quote rovhazman Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2018 at 06:30
Thank you Coast for bringing this thread up after 1 year... I should post here more often!
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Post Options Post Options   Quote Coast Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 2018 at 13:26
KamLan 50mm, f/1.1 (having fun)

hand held, hi ISO
Wavy Gravy Salesforce Tower
Coast

Edited by Coast - 07 May 2018 at 13:29
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Post Options Post Options   Quote darosa Quote  Post ReplyReply Direct Link To This Post Posted: 08 June 2017 at 23:48
Ready for Day 160!

3 Hugo Meyer & Co Goerlitz Weitwinkel Aristostigmat 1:9 F=160mm
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Post Options Post Options   Quote darosa Quote  Post ReplyReply Direct Link To This Post Posted: 08 June 2017 at 23:47
All made with a7rii + Kerlee 35/1.2

1 Wheels


2 Odd lenses cabinet
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