How come no other cheapies like Nifty Fifty?

Started Feb 14, 2012 | Discussions thread
kjbkix Regular Member • Posts: 230
Re: How come no other cheapies like Nifty Fifty?

Guys - the aperture is more than just some made-up number. It's actually the ratio of focal length to pupil diameter.

50/1.8 = 27.777mm
100/1.8 = 55.555mm

The 52mm and 58mm values you are quoting are the filter sizes. That's basically unrelated.

jvkelley wrote:

chromeshadow wrote:

I haven't seen my nifty fifty for a while, but I recall that the front glass diameter is a lot smaller than the filter ring size, so the point about doubling glass diameter/area may still be true even if the filter ring diameter doesn't scale.

That's a good point. Looking at the block diagram, I'd estimate the front lens on the nifty 50 is around 32mm or a little less. I stand corrected.

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