How come no other cheapies like Nifty Fifty?

Started Feb 14, 2012 | Discussions thread
photonius Veteran Member • Posts: 6,895
Re: How come no other cheapies like Nifty Fifty?

jvkelley wrote:

photonius wrote:

Another point about longer focal lengths. If you go from 50mm to 100mm, and want to maintain f1.8, you need to double the diameter of the lens (at least front).

I think is true for longer focal lengths, but it doesn't seem to be true in the 50mm range. The 50mm f/1.8 II has a filter diameter of 52mm. The 100mm f/2 USM has a filter diameter of 58mm.

Just a small note about filter diameters. There are limits in what is usually offered. Each manufacturer favors certain sizes and tries to maintain some standard so people don't have to buy too many different filter sizes.

Canon uses 52, 58, (any 6x ?), 72, 77, now 82mm.

So, I think while Canon could have made the 50mm f1.8 smaller, they left it bigger for handling reasons, and the mount throat is about 54mm diameter anyway, hence a filter of 52mm makes sense, even if a filter diameter of 42mm would have been enough.

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