Focal length 35mm equivalent, but not F-stop?

Started Jul 24, 2014 | Discussions thread
Great Bustard Forum Pro • Posts: 43,683
Re: Simple solution:

Bmoon wrote:

Great Bustard wrote:

Bmoon wrote:

Great Bustard wrote:

First and foremost, the lens should be stamped with it's *actual* focal length and f-ratio only. Secondly, if equivalents to another format are given, then the format must be named, and the equivalents spelled out. Let's use the Pentax MX-1 you gave as an example.

The lens is a 6-24 / 1.8-2.5, should be labeled as such, and it is. In terms of FF, it is equivalent to a 28-112 / 8.4-11.7. The way this should be written is:

The Pentax MX-1 has a 6-24 / 1.5-2.5 lens, which is equivalent to a 28-112 / 8.4-11.7 lens on FF, in terms of diagonal angle of view, depth of field, diffraction, and the total amount of light projected on the sensor for a given shutter speed.

Done. Simple, correct, and no confusion.

That would be too simple

I know, right?

I feel that perception of a product plays a role in what they acknowledge, something about having a 400mm F2.8 that you can fit in your pocket has some appeal.

Are you implying that marketing has more to do with the labeling than the facts?  You're treading on dangerous ground here, buddy! 

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tko
tko
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