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

Started Jul 24, 2014 | Discussions thread
bobn2
bobn2 Forum Pro • Posts: 63,535
Re: Focal length 35mm equivalent, but not F-stop?

mostlyboringphotog wrote:

Lee Jay wrote:

Lee Jay wrote:

I also use equivalence to make purchase decisions, and decisions about what equipment to carry into certain situations. Sometimes I use it for determining what settings I want to use in some situations.
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Lee Jay

"I also use equivalence to make purchase decisions,..." I like to challenge this sentiment.

I say that you have not chosen m43 because m43 f/2 is equivalent to f/4 on FF. You know FF can do f/2 as well as f/4.

Also, I will say that you have not chosen FF because f/4 is equivalent to f/2 on m43.

And so without the actual comparison of the real images that you're after, this equivalence is meaningless to make the purchase decision.

Nope...wrong. I use equivalence to plot lens (and format) performance envelopes, just like DPReview has started doing in their compact camera reviews (except mine are better). In fact they started doing that because of my repeated suggestions over several years.
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Lee Jay

Now I'm being passive aggressive - so you don't look at the images from potential equipment you want to buy? You buy FF because f/4 is equivalent to f/2 on m43?

You buy FF because when you see that f/4 is equivalent to f/2 on mFT, you realise that you have two extra stops in hand, if you need them. If you're never going to need them, then FF is a waste.

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Bob

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