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DPChallenge Forums >> Photography Discussion >> 10 Questions - Do You Know The Answers?
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 05/08/2007 11:03:54 AM · #26
Originally posted by idnic:
I'm surprised by how many have missed #10 ... its not a trick question. ;D


Could you explain that answer please?
 05/08/2007 11:04:37 AM · #27
Originally posted by idnic:
Originally posted by biteme:
cin could you pm me the correct answers? would like to learn something from the questions too ;)


You bet! I'll post them here later, after more people have had a chance to give them a try.


allright!
 05/08/2007 11:04:59 AM · #28
1 B
2 C
3 D
4 C
5 D
6 D
7 A
8 B
9 D
10 A

many guesses !
 05/08/2007 11:05:27 AM · #29
Originally posted by cloudsme:
Originally posted by idnic:
I'm surprised by how many have missed #10 ... its not a trick question. ;D


Could you explain that answer please?


I'll PM ya..... :)
 05/08/2007 11:07:32 AM · #30
Originally posted by salmiakki:

many guesses !


Whoa! 80% :D

Edit - misscored............90%!!! :D

Message edited by author 2007-05-08 11:08:16.
 05/08/2007 11:08:20 AM · #31
Yikes - that's a fluke!

Originally posted by idnic:
Originally posted by salmiakki:

many guesses !


Whoa! 80% :D
05/08/2007 11:08:20 AM · #32
Originally posted by idnic:
Originally posted by cloudsme:
Originally posted by idnic:
I'm surprised by how many have missed #10 ... its not a trick question. ;D


Could you explain that answer please?


I'll PM ya..... :)

Thanks very much Cindi
05/08/2007 11:09:19 AM · #33
I want a go at it:

1 d
2 d
3 a
4 c
5 d
6 c
7 a
8 b
9 c
10 d

Let me know how i did

05/08/2007 11:09:34 AM · #34
1. B
2. D
3. D
4. C
5. D
6. D
7. A
8. B
9. D
10. A
 05/08/2007 11:10:17 AM · #35
Okay, we have a 90% guess so here are all of the correct answersDon't read these if you want to test yourself first!:

1. B
2. D
3. D
4. C
5. D
6. D
7. A
8. B
9. D
10. A
 05/08/2007 11:11:26 AM · #36
Originally posted by kirbic:
Well, here's my (very quick) go:
1= D
2= None of the Above*
3= A
4= C
5= D
6= Ummm, pass.
7= A
8= B
9= D
10=C

* An 8x exposure difference is three stops. Starting with 1/2 second at f/32, you'd need 1/2 second at f/11, or 1 second at f/16... none of the answers seem to fit. Unless it is a trick question and 8x isn't really 8x for B+W film :-P


I agree with kirbic here (8X is 3 stops). None of the answers provided three stops more light.

Here are my answers:
1 B
2 ?
3 D
4 A
5 D
6 C
7 A
8 B
9 C
10 A
 05/08/2007 11:12:18 AM · #37
I got a 60%, i passed at least.

Yay Me!

Rich
 05/08/2007 11:13:04 AM · #38
Looks like ol' dad got a 100.

Sucks being a genius.
 05/08/2007 11:15:01 AM · #39
1-B
2-B
3-A
4-C (Same size, smaller FOV)
5-D
6-A
7-A
8-A
9-A
10-A
 05/08/2007 11:15:27 AM · #40
So... #2.. D is 3 stops faster, but that doesn't make any sense... Can anyone explain that?

Message edited by author 2007-05-08 11:15:48.
 05/08/2007 11:16:48 AM · #41
so many guesses...that were all wrong.

Message edited by author 2007-05-08 16:50:04.
 05/08/2007 11:19:41 AM · #42
But...D. 1/4 second at f/16 is only twice the exposure of 1/2 second at f/32 (two f-stops but half the shutter duration)...how can that be right?
 05/08/2007 11:22:47 AM · #43
Originally posted by bkpsu:
But...D. 1/4 second at f/16 is only twice the exposure of 1/2 second at f/32 (two f-stops but half the shutter duration)...how can that be right?


Why's everyone hating on f/22... is that not a stop between 16 and 32?
 05/08/2007 11:47:08 AM · #44
I agree the exposure question seems strange, unless there is something counterintuitive about "filter ratings".

I just don't understand why you'd *reduce* the exposure time when adding a filter?

splidge
05/08/2007 12:02:23 PM · #45
About question 2, I think that when you double the f-number, you go two stops, not 1.

A full stop in f-number means multiplying the number by 1.4 (the square root of 2) because you're increasing area.

Thus, F/1->F1.4 is one stop. F/16-F/22 is also one stop, or a halving of the light, and F/22->F/32 is another stop, or another halving of the light, so F/16->F/32 gives you two stops, or one quarter of the light.

That is, doubling or halving the shutter speed changes the light by a factor of 2, but doubling or halving the F/stop changes the light by a factor of 4.

So Kirbic's right - the right answer isn't there.

Assuming that the question is asking you to produce 8 times as much light, that would be 3 stops. Any of these would work beginning from 1/2, F/32:
4, F/32
2, F/22
1, F/16
1/2, F/11
1/4, F/8

Message edited by author 2007-05-08 12:15:07.
 05/08/2007 12:04:17 PM · #46
Originally posted by levyj413:
I think that when you double the f-number, you go two stops, not 1.



Hey Levyj413, not necessarily true. Example: F2 to 2.8 is a full stop. It has to do with the ratio.
 05/08/2007 12:06:37 PM · #47
Originally posted by jaysonmc:
Originally posted by levyj413:
I think that when you double the f-number, you go two stops, not 1.



Hey Levyj413, not necessarily true. Example: F2 to 2.8 is a full stop. It has to do with the ratio.


Correct. And when you go from F/2 to F/4 you go two stops. F/2.8 to F/5.6 is also two stops.

I said "double the F-number" not "double the amount of light."

Message edited by author 2007-05-08 12:07:01.
 05/08/2007 12:11:11 PM · #48
I had 60% right.
The thing is I got all the calculation/math and color questions right.
I missed all the lighting (studio) stuff. Oh well, now I know where I need to brush up.

Yes, #2 is 3 stops. I am pretty sure f22 is a full stop from f16.
 05/08/2007 12:13:17 PM · #49
Originally posted by levyj413:


I said "double the F-number" not "double the amount of light."


Sorry, read that wrong. :)
 05/08/2007 12:13:30 PM · #50
Originally posted by jaysonmc:
I am pretty sure f22 is a full stop from f16.


Exactly, because 16*1.4=22 (rounded to a whole number)
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