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05/19/2008 02:08:40 PM · #51 |
Originally posted by Spazmo99:
Originally posted by scalvert:
Originally posted by Spazmo99:
How does the 5D have shallower DOF? |
The main reason: a 5D will capture the same view with a 16mm lens that you would get with a 10mm lens on a 40D, but the shorter focal length of a 10mm lens means that the 40D image will show much greater DOF at the same aperture. The same principle makes it tough to get shallow DOF with the small sensors of most P&S cameras. |
It's due to the magnification ratio due to the smaller sensor, and NOT the focal length.
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I thought that it was all down to the focal length, given that one is framing the shot in the same way from the same position.
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05/19/2008 03:59:33 PM · #52 |
Originally posted by Mr_Pants:
Originally posted by Spazmo99:
Originally posted by scalvert:
Originally posted by Spazmo99:
How does the 5D have shallower DOF? |
The main reason: a 5D will capture the same view with a 16mm lens that you would get with a 10mm lens on a 40D, but the shorter focal length of a 10mm lens means that the 40D image will show much greater DOF at the same aperture. The same principle makes it tough to get shallow DOF with the small sensors of most P&S cameras. |
It's due to the magnification ratio due to the smaller sensor, and NOT the focal length.
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I thought that it was all down to the focal length, given that one is framing the shot in the same way from the same position. |
To get the same image framing with a smaller sensor camera, you would need a wider angle lens, but, if you take two lenses of different focal lengths and put them on the same camera, but frame the shot with each lens so the the subject is the same size (i.e. the same magnification ratio), the DOF will be the same for each lens assuming that the same aperture is used for each lens. |
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05/19/2008 04:05:59 PM · #53 |
Originally posted by Spazmo99:
if you take two lenses of different focal lengths and put them on the same camera, but frame the shot with each lens so the the subject is the same size (i.e. the same magnification ratio), the DOF will be the same for each lens assuming that the same aperture is used for each lens. |
You'd have to change the distance to the subject in order to frame the shot the same, effectively canceling out the difference in focal length. If you take two lenses of different focal lengths and put them on the same camera and then crop the shorter focal length images to match the field of view of the longer lens (changing only the magnification), the DOF will not match.
Message edited by author 2008-05-19 16:09:56. |
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05/19/2008 04:08:37 PM · #54 |
Originally posted by scalvert:
Originally posted by Spazmo99:
if you take two lenses of different focal lengths and put them on the same camera, but frame the shot with each lens so the the subject is the same size (i.e. the same magnification ratio), the DOF will be the same for each lens assuming that the same aperture is used for each lens. |
You'd have to change the distance to the subject in order to frame the shot the same, effectively canceling out the difference in focal length. If you take two lenses of different focal lengths and put them on the same camera and then crop the shorter focal length images to match the field of view of the longer lens (what actually happens with a small sensor), the DOF will not match. |
Yes, but by simply changing lenses, you've changed magnification ratios.
And why on earth would you shoot with a wider lens and just crop to what a longer lens would be, assuming that you have the longer lens?
Message edited by author 2008-05-19 16:09:10. |
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05/19/2008 04:22:10 PM · #55 |
Originally posted by Spazmo99:
why on earth would you shoot with a wider lens and just crop to what a longer lens would be |
That's what a small sensor does- it crops the image area of a wider angle lens which, when enlarged, gives the appearance of a longer lens. Put a 5D on a tripod and take a shot with a 50mm lens at f/2.8. Then take a shot with a 31mm lens at f/2.8 and crop it to the same field of view as the 50mm lens. You have just reproduced the effect of a small sensor, and the DOF will not match because the focal length was different at the same distance and aperture. Magnifying the cropped image has no effect on the captured DOF. |
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05/19/2008 04:48:34 PM · #56 |
Originally posted by scalvert:
Originally posted by Spazmo99:
why on earth would you shoot with a wider lens and just crop to what a longer lens would be |
That's what a small sensor does- it crops the image area of a wider angle lens which, when enlarged, gives the appearance of a longer lens. Put a 5D on a tripod and take a shot with a 50mm lens at f/2.8. Then take a shot with a 31mm lens at f/2.8 and crop it to the same field of view as the 50mm lens. You have just reproduced the effect of a small sensor, and the DOF will not match because the focal length was different at the same distance and aperture. Magnifying the cropped image has no effect on the captured DOF. |
do you have answers to questions just saved to your clipboard? lol |
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05/19/2008 05:17:29 PM · #57 |
Originally posted by Fetor:
Originally posted by scalvert:
Originally posted by Spazmo99:
why on earth would you shoot with a wider lens and just crop to what a longer lens would be |
That's what a small sensor does- it crops the image area of a wider angle lens which, when enlarged, gives the appearance of a longer lens. Put a 5D on a tripod and take a shot with a 50mm lens at f/2.8. Then take a shot with a 31mm lens at f/2.8 and crop it to the same field of view as the 50mm lens. You have just reproduced the effect of a small sensor, and the DOF will not match because the focal length was different at the same distance and aperture. Magnifying the cropped image has no effect on the captured DOF. |
do you have answers to questions just saved to your clipboard? lol |
even worse, he actually knows this stuff, I think. |
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05/19/2008 05:23:48 PM · #58 |
Last year I won a nice used car at the fair. I sold said car for $4000. I purchased a 5D, a 70-200 F/2.8L IS, also a 580EX II, and a cheep monopod, 2 extra batteries, and a battery grip . At the same time Adobe had a promotion allowing me to upgrade photoshop Elements 4 to CS3 for a really good price.
If I had any doubt about my decision on the 5D, it was quickly elevated by several posts of problems about the 40D.
BTW, Yes I am happy with my purchase. |
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05/19/2008 05:34:59 PM · #59 |
That's AMAZING Leah! Hope you stock up on some really sweet equipment!
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05/19/2008 06:01:17 PM · #60 |
Congratulations! I personally vote that you take a trip to Hawaii. And you'll obviously need someone to tag along, so I humbly volunteer to be your date, haha.
Or if photography has taken over your life as much as everyone else here, you'll probably have more fun with a 40D or 5D. Damn, haha.
And I don't think you could go wrong with either body. If you're feeling adventurous, it wouldn't hurt to take a peek at a D300... |
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05/19/2008 06:08:44 PM · #61 |
You know what you should honestly do with the money?
Take 75% of put it into a High Interest CD, Bond, or into a high interest savings account and just let it sit there. The CD's are nicer because you can't touch them for a period of time.
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05/19/2008 06:37:11 PM · #62 |
actually i think things like this do happen everyday. it's unfortunate in many ways IMO.
but congrats on the cash !
Originally posted by Sinky:
That is seriously good news!! Things like that dont happen every day. |
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05/19/2008 06:41:37 PM · #63 |
Hey Congratulations!!! I love hearing good news stories!!
Another idea to spend some of your hard won money would be a trip down here...
Europe meets Canada
;)
Message edited by author 2008-05-19 18:46:38. |
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05/19/2008 07:46:09 PM · #64 |
Originally posted by Shecoya:
Hey Congratulations!!! I love hearing good news stories!!
Another idea to spend some of your hard won money would be a trip down here...
Europe meets Canada
;) |
what she said!
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05/20/2008 01:15:09 PM · #65 |
Originally posted by jmlelii:
You know what you should honestly do with the money?
Take 75% of put it into a High Interest CD, Bond, or into a high interest savings account and just let it sit there. The CD's are nicer because you can't touch them for a period of time. |
I actually already have a CD from my dad's inheritance. I won't say how much it is, but let's just say it's gained about 1K a year in interest for the last four years. Anyway I can't/won't touch that until I'm 25 or 30.
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