« on: March 30, 2013, 11:10:40 PM »
Really like the first image. Well done
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This is worth having a look at http://www.garyluhm.net/bio/tips_0512.html Helped me out when I was at the IBPC trying to track a Red Kite going through trees...400 may be a bit short.. but you will love it. I don't do much birding but the majority of my sports shooting is 61point auto, case 2 with accel/decel set to 1 and point switch to 0 for skiing. Kayaking I use Case 2 with the slider all the way over to locked on with accel/decel to 2 and switching to 1.
I think depending on the distance a 400mm will be more than enough... Normally I end up using my 70-200 2.8 mk2 and sometimes 200mm can be too much... I've used my 400mm 2.8 mk2 and 600mm 4 mk2 for birds in flight, It takes a lot of practice with the 600mm...
If budget is not an issue, why not get THE BEST ZOOM lens on the market(24-70 f2.8 II). Especially, FF upgrade in the future.
24-105 F4 is too slow for crop, not a great lens for indoor. sharpness is
It's indicative of brightness, lenses are usually at their best stopped down a bit, so max aperture lets you know the starting point, also in most modern af systems the faster the max aperture the better the af performance, regardless of shooting aperture.Spot on. Most lenses, even the ones which are very sharp wide open hit their sweet spot around f8, and most current FF canon SLR's suffer from diffraction around f11, most current crop Canon SLR's suffer from it from around f7. So whether a lens stops down to f16 or f32 is less relevant than its max aperture.
Minimum aperture can cause it's own problems, particularly when considering that dslrs of different sensor sizes and generations have different pixel pitch, the effects of aperture limited diffraction mean that the desirable minimum aperture can vary vastly between say a 1100d and a 7d or even between a 5d and a 5d3.
It's similar to how simple engines specs are engine size and max power. Not how much power is delivered when the engine is at its smoothest, or how little power it can deliver before stalling.