What is considered fast?

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dbose Regular Member • Posts: 373
What is considered fast?
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Just moved here from APSC land and currently own only a Samyang 45 1.8 and will be slowly adding more as I save up coin.  I have decided that to justify the cost of switching that I will only get “fast” lenses but was wondering why there seems to be a double standard or a different standard for Full Frame.  Case in point when the first F2.8 native APSC zoom came out for Sony people were saying  “Finally, a fast standard zoom!” but in FF equivalent that is an f4.2 which is often referred to as slow in this forum.  So is f4 fast or slow?  Is f2.8 considered fast for APSC because of the limited selection or is there an exposure similarity where f2.8 is the same only Dof changes?

Thanks for educating me

Dave

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