atlrus wrote in post #12831371
See, this is why I don't get your reasoning for starting this thread - it appears you want to give some sort of advice about cropping, but it's far from clear.
Thanks for coming back in the game!
And I think the "advice" isn't clear, because I've only just noticed it myself and am not so sure how to expand on it.
That's the "why", of me starting the thread.
And I think Sue (out of everyone so far) has best seen through my quagmire of explanation.
Why not take the 150-500? Because:
a.) I was taking my daughter to this zoo, first time there. I had no idea there is a free-roaming giraffe/zebra sanctuary, so I only took the 24-105.
b.) the 150-500 is big and heavy, not the best lens for a day at the zoo
I think we're homing in on some important stuff here...
You'd not been to the zoo before....but you do know what a zoo is, yes?
This nugget of knowledge should tell you that a 24-105 lens will only be good for limited shots. The best you can do with that FL range on a 5D2 is to take city/landscapes, portraits, etc. That's where the lens shines on a full-frame camera. And I'm sure you know this.
At a zoo/safari park etc., if I want to take proper photos, and not snapshots I take my 100-400 (1.4kg v 1.91kg for your Siggy 150~500mm).
Which leads on to "c)."
c.) and this is where your advice gets murky. I hope you realize that even if I had the 150-500 the composition would have been exactly the same. The lens could not help me go lower, go higher or move left or right. So in essence I would've had the exact same shot, cropping or not. The only difference between using the 24-105 and 150-500 would be the zoom, which I achieved through cropping.
WRONG WRONG WRONG!!!!!
Have you no idea about depth of field?!?!?!?!?!!?!?!
OK, so the "framing" might be the same, but the image would be DIFFERENT!
105mm @ f/4 is NOT going to produce the same image except for what you "achieved through cropping", had you used the 500mm end of your 150-500 @ f/6.3.
As an example, if your giraffe is 100' away, using the 105mm@f/4 gives sharp(ish) focus from 75' away, through the subject, and begins to blur around 149' away.
BUT, using the 500mm@f/6.3 gives a range from 98', through the subject, and going soft at 103', or thereabouts.
Using the 500mm would have created some bokeh, changing your "might as well have used a $100 P&S camera" shot, into something vaguely interesting.
AND THAT'S THE POINT!
If you don't understand that, don't bother buying a digital SLR camera and expensive lenses.
Give the money to charity instead, and use your cellphone camera!
.../snipped/...Did you notice how I never commented on any of your cropped photos?
I don't CARE about cropping as such (for the millionth time).
What I'm advising against is "HABITUALLY CROPPING HEAVILY".
Why?
Because, mathematically speaking, you are subtracting a statistically significant (and artistically relevant) section of the image where the 'circle of confusion' (look it up) created by the unique refractive qualities of the lens elements, combined with the maximum aperture used, no longer exceeds the resolution of our eyes.
Thus, you might as well use a P&S camera.
(Attached: correct lens, correct framing to create a story - part of a series about caged animals; specifically primates - correct aperture to blur out an uninteresting background, minimal cropping).
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