Thanks jerome = That's another jewel of advice, how to shoot the runners as they run. Yes, I agree that sagging breasts are unflattering. Thanks!!
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Yes, I also fail to understand... why we need 40+ MP cameras. Sigh...
You don't need it, but it sure is nice when you have it. The only way to get it right now is MF. There are trade offs for MF - and they are huge:
Lens options - let's be honest, there are 10x more in the 35mm world than in the medium format world
Lens length - 200-400mm zoom, 800mm lenses - 35mm has this covered, 645 shooters just got a 2x extender
Shots per second - up to 14fps - need I say more? Phase does a dark frame equal to your exposure, and Hasselblad does 1fps
Speedlites - TTL is your friend, and doesn't exist in in the MF world, so your wireless remotes are just 'pop'
So, for people who want these high MP images in the 35mm format, the ability to use these advantages is huge.
But, 40/50/60/80mp images are AMAZING to work with, and when printed are a whole different ball of wax. There is a market for it, but there is an associated cost to it. I can do a 24x36 print, and my resolution is 300 pixels per inch - off of a native file. Yes, you can interpolate up to this, and even higher, but side by side, a MF image at size will look better.
I wonder how the new firmware affects this when using 3rd party batteries? From reports I've read elsewhere the battery always reports 100% when using non Canon batteries regardless of the actual charge level. Sounds like 3rd party batteries could be the way forward!
Of course, the big advantage of the Tamron comes either in low light situations (this link has an image I took in the DC Metro handheld at .8 seconds!) http://www.dustinabbott.net/2013/03/metro-arrival/ or when you want shallow depth of field. I really love the lens for that type of shot because I find the transition from focus to ooF very smooth with the Tamron. I often will pack a prime with me for this types of shots, and I didn't miss not having one with me at all on this trip.
Left eye. It's my dominant eye, meaning it's the primary eye that I use for vision. This may come as a surprise to most readers, but nearly all of us have dominant eyes. Normally, the dominant eye is on the same side of you as your dominant hand. So, most right handed people are right eye dominant and vice versa. I'm part of the 20% of the population that is cross-dominant, meaning that I'm right handed but my dominant eye is my left eye. Curiously, my vision is weaker in my left eye than my right eye, although with glasses it corrects to 20/20.Ditto for me on cross dominance and the discussion on dominant eyes. My left eye is more in focus and dominant over my right eye but I am right handed. I use my left eye 95% of the time for my photography and close the right eye when I really need to concentrate.
Here's a simple test to determine which of your eyes is the dominant one. Extend your dominant arm completely and raise the first finger. Look at it with both eyes. Close one eye while watching the finger. Then, open that eye and close the other eye. Does the finger appear to move when one of your eyes is closed and remain still when that eye is open and the other is closed? When the finger doesn't appear to move you're looking at it with your dominant eye.