Posted: 5/31/2015 9:22:17 PM EDT
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And before anyone asks, my GF sucks at math, so she can't help me.
I've posted a few threads here about macro photography. There's another one coming later, and this kinda relates. I'm trying to figure out the magnification or reproduction ratio of my setup. The sensor on my camera is 23.5mm or 0.925 of an inch. Meaning for a 1 to 1 reproduction ratio (life size) If I took a picture of a ruler, I'd get nearly an inch, but not quite to fill the frame. Stay with me here. Here's the picture I took of a ruler: 
Assuming my reading this is correct, I can see 5/8 of an inch here. This picture is uncropped, by the way. So since I'm seeing LESS of the ruler than a 1 to 1 would give me, this means I've got a GREATER than 1 to 1 reproduction ratio. What I want to know is... what's the actual number. Life size is 1:1. Mine is x:1. What's x? And whoever gives the correct answer, please tell me HOW you came up with that answer, I'm trying to learn here. I am terrible with math 
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Quoted:
Settling a math question with a poll of mostly drunk nutcases. This is still slightly better than common core.  Quoted:
Quoted:
Thanks GD. 3 different answers so far, keep em coming. Once there's a few stand outs, I'll put up a poll Settling a math question with a poll of mostly drunk nutcases. This is still slightly better than common core. THIS  Reading this shit thinking it's Sunday what response do you think you'll get?
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Size of your picture = 5/8" = 0.625"
Size of your lens is 0.925" 0.925 / 0.625 = 1.48 Therefore you have a 1:1.48 ratio i.e. your picture shows 1" of every 1.48". You can invert that if you want: 1 / 1.48 = 0.676:1 Check it backwards: 0.925 lens size * 0.676 ratio = 0.625" picture. Disclaimer: I just spent 4 1/2 hours driving with 3 women passengers yapping non-stop. I may well be disorientated and confused
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Quoted:
Size of your picture = 5/8" = 0.625" Size of your lens is 0.925" 0.925 / 0.625 = 1.48 Therefore you have a 1:1.48 ratio i.e. your picture shows 1" of every 1.48". You can invert that if you want: 1 / 1.48 = 0.676:1 Check it backwards: 0.925 lens size * 0.676 ratio = 0.625" picture. Disclaimer: I just spent 4 1/2 hours driving with 3 women passengers yapping non-stop. I may well be disorientated and confused
You poor bastard |