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03-13-2009, 06:55 AM   #1
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spot the difference

I know, I know...
it's not fair comparison but I couldn't resist....
so here we have 3x 100% crop from the same scene shot with 3 different lenses. Camera was moved between shots to obtain roughly the same magnification. All shots on f4 (wanted to shoot at f2.8 but it would've been disatvantage for DA40 as it would be wide open) 1/50 in M, ISO400 and custom WB on K10D
The lenses are:
FA31ltd, DA40ltd, F50/1.7

PS: I know there is slight shift in focus between them but I have to trust AF, my eyes couldn't possibly focus anything like this with anything shorter then 100mm.

so have a guess and let me know, which one is which?

BR

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03-13-2009, 07:42 AM   #2
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not easy because the focus plane is varying between shots,
but my guess would be:

#1 50/1.7
#2 31/1.8
#3 40/2.8
03-13-2009, 07:48 AM   #3
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50

40

31

10char.
03-13-2009, 07:51 AM   #4
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i looked at the exif and booy was i wrong.

i wonder if changing the distances had anything to do with it, also what made you choose 1/50 iso 400 ?

the first one is clearly overexposed compared to the other two.

03-13-2009, 07:51 AM   #5
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50
40
31

erm never mind, boy was I wrong
03-13-2009, 08:01 AM   #6
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1. 31
2. 50
3. 40

Based on perspective of background to foreground.
03-13-2009, 08:19 AM   #7
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Ouch, just realized that there are indeed some exif tags left
03-13-2009, 08:34 AM   #8
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Original Poster
QuoteOriginally posted by patrickhh Quote
not easy because the focus plane is varying between shots,
but my guess would be:

#1 50/1.7
#2 31/1.8
#3 40/2.8
nope...

QuoteOriginally posted by Gooshin Quote
50

40

31

10char.
nope - 1 correct

QuoteOriginally posted by Gooshin Quote
i looked at the exif and booy was i wrong.

i wonder if changing the distances had anything to do with it, also what made you choose 1/50 iso 400 ?

the first one is clearly overexposed compared to the other two.
indeed...

since the longest lens used was 50 I simply went for the safest handholdable speed. Yes, all of them are handheld...now I can hear the sighs all the way to London ... but I wasn't bothered with tripod

QuoteOriginally posted by Nesster Quote
50
40
31

erm never mind, boy was I wrong
nope - 1 correct

QuoteOriginally posted by G_Money Quote
1. 31
2. 50
3. 40

Based on perspective of background to foreground.
nope - 1 correct

03-13-2009, 08:43 AM   #9
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QuoteQuote:
Axl: so have a guess and let me know, which one is which?
Well, I tired but it is not easy to do, even with comparative picture software in use. Different parts of the frame are handled better in different shots. For example, the bottom, left-hand star is best rendered in the first shot. But the top, center star looks best in the third shot. The focal plane differences, as mentioned already, could be accounting for this. I think it is fair to say the 3 lenses are closer to each other in performance than they are different--at least in this scene.
03-13-2009, 08:53 AM   #10
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From the information you gave, it therefore must be

31
40
50
03-13-2009, 08:57 AM   #11
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03-13-2009, 09:34 AM   #12
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EDIT: 'Thanks' retracted.

Here's my deduction:

Based on axl's answers: 50 isn't 1st, 31 isn't 2nd, 40 isn't 3rd.
Either 40 is 2nd or 31 is 3rd, but not both.

So the only possible choices are
31 40 50
or
40 50 31

The rest was a guess.

Last edited by asdf; 03-13-2009 at 10:01 AM.
03-13-2009, 09:49 AM   #13
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thats not why i posted the picture but if it makes you feel better...

plus an easier way is to just use an internet browser plug in that shows exif info....
03-13-2009, 09:56 AM   #14
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QuoteOriginally posted by Gooshin Quote
thats not why i posted the picture but if it makes you feel better...

plus an easier way is to just use an internet browser plug in that shows exif info....
Of course cheating is the easiest way.
03-13-2009, 10:15 AM   #15
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given the um, procedure, used in this test, i hardly find my approach cheating
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