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DPChallenge Forums >> Photography Discussion >> Guess the aperture - idea
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Registered UserAlmilan
 Canon EOS-400D Rebel XTi 		05/19/2007 04:47:09 AM
I'm not sure if this has been suggested before, but I think I might find it fun and useful to have a 'guess the aperture' thread.

It could work like this:
Someone posts a photo without the f number and then the rest of us can try and guess.

This could be a good idea for noobz (like me) who don't fully understand the dof thing too well. It may also help people decide which f stop is most effective in a particular situation.

What do you all reckon? Should we start a 'guess the aperture' thread??

Alex
Registered Userfstopopen
 Canon EOS-350D Rebel XT 		05/19/2007 05:13:56 AM
I think you just did.

drake
Registered Usergoodman
 Canon EOS-40D 		05/19/2007 06:06:47 AM
503151.jpg

ok guess this one.
MemberSteveJ
 Nikon D300 		05/19/2007 06:07:52 AM
f11
Registered Usergoodman
 Canon EOS-40D 		05/19/2007 06:12:23 AM

nope
Registered UserDaveSM
 Canon EOS-350D Rebel XT 		05/19/2007 06:17:35 AM
When posting a photo people should tell the lense used for this shot. F4 from a 400 mm telephoto objective on a cropped sensor vs F4 from a macro lense on a full frame body won't give the same depth of field. A long distance will increase the depth of field so using a long lense on the last shot with the same aperture will give a deeper depth of field then a short lense close to the subject.

My guess
15-28mm F12-16 on a cropped sensor ;)
Registered Usergoodman
 Canon EOS-40D 		05/19/2007 06:21:21 AM
nope
Memberdarnok
 Nikon D200 		05/19/2007 06:22:22 AM
f8 on a wide angle.
Registered UserAlmilan
 Canon EOS-400D Rebel XTi 		05/19/2007 06:37:58 AM
Ok, I seem to have kicked this off. My guess:

F22

There is a great DOF, imo.
MemberJudi
 Canon EOS-5D Mark II 		05/19/2007 06:50:10 AM
That's a 5.6
Registered Userssodell
 Canon EOS-300D Rebel 		05/19/2007 06:54:51 AM
Gotta be 8.0 eh?
Registered Usergoodman
 Canon EOS-40D 		05/19/2007 06:56:22 AM
nope
Membereyewave
 Canon EOS-5D 		05/19/2007 07:02:16 AM
looks like a 4.0 max
(taken with your 10-22 ?)

Message edited by author 2007-05-19 07:03:26.
Registered UserAlmilan
 Canon EOS-400D Rebel XTi 		05/19/2007 07:43:14 AM

Originally posted by DaveSM:
When posting a photo people should tell the lense used for this shot. F4 from a 400 mm telephoto objective on a cropped sensor vs F4 from a macro lense on a full frame body won't give the same depth of field. A long distance will increase the depth of field so using a long lense on the last shot with the same aperture will give a deeper depth of field then a short lense close to the subject.


Maybe it would be a good idea to mention the lens and the camera?

PS this is not as easy as I thought it would be.

Message edited by author 2007-05-19 07:45:34.
Registered Usergoodman
 Canon EOS-40D 		05/19/2007 08:01:13 AM
30D :)
Memberkudzu
 Nikon D70 		05/19/2007 08:31:09 AM
1.8
Registered UserAlmilan
 Canon EOS-400D Rebel XTi 		05/19/2007 08:44:37 AM
Originally posted by goodman:
30D :)

If you didn't take the shot with your default shooter, that is;)
Registered UserMan_Called_Horse
 Canon EOS-300D Rebel 		05/19/2007 09:25:09 AM
It is almost impossible to guess the f stop without know the other peramiters. IE, lens, shutter speed, iso

If you want to make this a learning thread, than add the other information.

If you want to keep this a game, then keep it as it is.
Registered Usermalina
 Canon EOS-1D Mark II 		05/19/2007 10:52:11 AM
3.5
Registered Usergoodman
 Canon EOS-40D 		05/19/2007 11:14:11 AM
10-22mm at 1/1000 sec
Memberkirbic
 Canon EOS-5D 		05/19/2007 11:17:55 AM
Originally posted by goodman:
10-22mm at 1/1000 sec


Hee hee... if that was taken with the 10-22 @ 10mm, there's pretty much no way to tell what the aperture was... assuming focus at a little over 2 meters, everything from about 1.2 meters out to infinity will be in focus, even wide open at f/3.5.
Registered Userpcody
 Canon PowerShot G6 		05/19/2007 02:09:01 PM
5.6
I think it's more fun to try and guess the lens range also. That's a major part of composing pictures. Knowing which lens to use in which situation. Look at the field of view. Perhaps it would be better to say if the picture was cropped or not because that would throw fov off.
Registered Userfotomann_forever
 Canon EOS-350D Rebel XT 		05/19/2007 02:25:22 PM
LOL, what a funny thread :-) Can we play guess my weight next?
Registered Useroscarmeyer
 Canon EOS-30D 		05/19/2007 02:37:52 PM
4.5!!
MemberSteveJ
 Nikon D300 		05/19/2007 02:40:53 PM
2.8
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