ItsAllABadJoke

ItsAllABadJoke

Joined on Oct 2, 2011

Comments

Total: 3, showing: 1 – 3
In reply to:

yabokkie: 12 elements in 10 groups, same as Zeiss Otus?
T1.6 may mean an f-number smaller than f/1.4
thus this lens could be called "fast" and
less than one stop slower than 35/2 on 35mm format.

This is stolen from another (smart) dpreviewer, but explains the relationship between F(T) on FF and M43 very well.

"This is true only if you compare for the same focal length (expressed in mm), which is not a very photographically relevant comparison since a 50 mm lens has a much wider field of view on an FF camera (where it is a normal lens) than on an MFT camera (where it is a short tele with the same field of view as a 100 mm lens on an FF camera).

If, instead, you compare at the same field of view and the same subject distance, then it is the other way around: FF has more shallow (i.e. less) DoF than an MFT camera at the same aperture and has to be stopped down two stops further to reach parity.

For example:

An MFT camera with a 25 mm normal lens at f/2.8 at a focus distance of one meter will have a DoF of 13 cm.

An FF camera with a 50 mm normal lens at f/2.8 at the same focus distance will have a DoF of 6 cm. However, if you stop down to f/5.6, the DoF increases to the same value as for the MFT camera at f/2.8, i.e., 13 cm."

Direct link | Posted on Dec 13, 2013 at 18:09 UTC
On Mirrorless Roundup 2011 article (429 comments in total)

I'm wondering why lens ratios were not posted for the mirrorless cameras. The reason I like the micro four-thirds is the 1:2 lens ratio. 1/2 the size, 1/2 the light needed, etc.

Who cares about the camera size, when the lens is what is usually filling up the camera bag?

Am I missing something here?

Direct link | Posted on Dec 25, 2011 at 04:50 UTC as 18th comment | 4 replies
In reply to:

Richard Butler: I've corrected the mistake on the Eastern timezone.

If you're in the US, it's available from the afternoon/evening of Saturday, through to the same time on Sunday.

If you're in Europe, it's essentially available all day Sunday.

If you're in Australia, it'll be available from around lunchtime on Sunday (depending on where you are in the country)

-retracted-

Direct link | Posted on Dec 17, 2011 at 22:34 UTC
Total: 3, showing: 1 – 3