MLynnL
Senior Member
Last Friday I tested out my 300mm f/4L IS over the range of apertures and found it to be about as sharp at f/4 as it is at f/8. The quality started to drop off around 11 and continued downward from there. I will try to post some crops tonight. This was on a 10D so results may be different on a body with a smaller crop factor like a 1Ds.
Greg
Greg
Well, it's discontinued, but a used ( or even new and sitting on
the shelf ) should be a lot cheaper than the current IS model.
It's definately sharper below f/8. Both 300 mm primes are
fantastic lenses, but the older one is razor sharp right out of the
gate.