CV 35/1.2 vs CV 35/2.5

[reala_fan]

How many stops faster is the 35/1.2 than the 35/2.5?

Two and a half stops faster?

...

 

[pagpow]

Close, but not quite. 1.2 is one half stop faster than 1.4, 2.5 is one third stop faster than 2.8 -- so that looks like 2 and one sixth stop faster -- which I'd be tempted to call 2 stops unless we knew more about the actual, rather than the nominal, relative apertures.

 

[kully]

two and a little horse jockey size amount

http://en.wikipedia.org/wiki/F-number

 

[reala_fan]

Close, but not quite. 1.2 is one half stop faster than 1.4, 2.5 is one third stop faster than 2.8 -- so that looks like 2 and one sixth stop faster -- which I'd be tempted to call 2 stops unless we knew more about the actual, rather than the nominal, relative apertures.

Yeah, sounds right. And according to a chart on this page:

Wiki Page

It also indicates two stops faster (see the 'Typical one-third-stop f-number scale')

Appreciate...

 

[gshybrid]

should be two stops

 

[Sparrow]

two and a smidgen then?

 

[payasam]

Well, a damn sight faster.

 

[angeloks]

You can say that 2 stops weight 359 grams in that case (490 vs 131)!

 

[BillBingham2]

On the positive side for me the 1.2 takes 52mm filters. My personal standard (read I have a large stock of them).

B2 (;->

 

[kshapero]

I have had both at the same time. What a team!

 

[ferider]

Here is a list of 1/6th stops:

One really should measure transmission of both lenses to be exact. But I think 2 stops difference is a safe statement, if you assume proper rounding of the numbers was done 🙂

The two lenses really complement each other: bokeh is equivalent, the rest is distortion vs. speed vs. size and VF obstruction.

Roland.

 

[payasam]

Something to do with logarithms, isn't it?

 

[Astragony]

actually it's about square root of 2

 

[kevin m]

I have had both at the same time. What a team!

I had them both, too. An absolute screaming value.

 

[SimonSawSunlight]

agreed. no versus, they're a perfect match.

 

[papasnap]

Well, a damn sight faster.

hahaha agreed

 

[kossi008]

actually it's about square root of 2

[nitpicking]The 12th root of 2 in this case.[/nitpicking]