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

Started Jul 24, 2014 | Discussions thread
Bmoon Regular Member • Posts: 291
Re: Simple solution:

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.

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