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Hi Jeremy, there are several factors to consider here.
Firstly, budget of around $200; hard to find a decent prime lens shorter than 50mm for that price, even used.
The 55-250 is about twice the length of the 50mm, and more than twice the weight[which Carlton remarked upon.]
For AP a lens is not usually used wide open because of optical aberrations,
usually at least one stop down, and often more. The 55-250 is wide open
at 55mm at f/4, so would normally be used at f/5.6 or f/6.3, which is glacial
compared to the 50mm used at f2.8 or f/3.5.[it is actually acceptable at f/2.5].
The 50mm is also slightly sharper than the 55-250.
raymo
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