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Archive 2011 · 85mm dilemma L vs. 1.8
  
 
Grantland
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p.5 #1 · p.5 #1 · 85mm dilemma L vs. 1.8


i like these shot at f/1.2

i also have the f/1.8 and use it primarily for indoor sports.

grant












Dec 31, 2011 at 03:58 PM
RobertLynn
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p.5 #2 · p.5 #2 · 85mm dilemma L vs. 1.8




Just a small point, there is not a full f stop between f/1.2 and f/1.8.
Typical one-quarter-stop f-number scale
f/# 1.0/ 1.1/ 1.2 /1.3 /1.4/ 1.5/ 1.7/ 1.8/ 2/ 2.2 /2.4/ 2.6/ 2.8

<~~~~~~~~~~~~~~~Marko


And I responded to it with, the below post. For whatever reason it has the "whole post" in white, like I wrote it, but I only wrote from, "Perhaps I'm confused....seeing photos you post".

I am sorry for the confusing. I was just questioning the guy *(marko) who said that there's not a full f/stop, but pointing out in 1/4 increments, that it's MORE than one f/stop.


marko1953 wrote:

"Since there is a stop between 1.8 and 1.2, ".


Just a small point, there is not a full f stop between f/1.2 and f/1.8.
Typical one-quarter-stop f-number scale
f/# 1.0/ 1.1/ 1.2 /1.3 /1.4/ 1.5/ 1.7/ 1.8/ 2/ 2.2 /2.4/ 2.6/ 2.8

1.21.8
<~~~~~~~~~~Marko


Perhaps I'm confused. A quarter of something is 1/4. Meaning 4/4 is 1, and 5/4 is 1 and 1/4.

Start at 1.2
Move up 1/4 to 1.3 (1/4)
Move up 1/4 to 1.4 (2/4)
Move up 1/4 to 1.5 (3/4)
Move up 1/4 to 1.7 (4/4)
Move up 1/4 to 1.8 (5/4).

Isn't that more than one f/stop? Maybe it's the metric system and I'm confused.



@daweiye. Dude, don't you ever talk down your stuff again. You're an excellent photographer. It's not as often as I would like, but I enjoy seeing the photos you post.





Dec 31, 2011 at 04:46 PM
RobertLynn
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p.5 #3 · p.5 #3 · 85mm dilemma L vs. 1.8


marko1953 wrote:
I think you are right!!!
If we multiply the diameter of any circle by the square root of 2 we have calculated a revised diameter that is twice as big. Stated another way, to double the light gathering power of a lens we multiply the current diameter by 1.414. We don’t need to be so exact so we can use a shortened value of 1.4.

Conversely to reduce the light entering the camera by half, we multiply the current diameter by 0.707. This is the inverse of 1.4. We can also divide by 1.4 to get the same answer but the
...Show more


Thank you. I believe that Stan, and the other gentleman thought that I was stating it differently, because only part of the quote was used, and also that for whatever reason, when I quoted you, the text appeared as white, as if I wrote it.



Dec 31, 2011 at 04:50 PM
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