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Welcome Forum: Discuss So happy to be here & need a bit of H-E-L-P...So great to be a new part of this wonderful forum. Hello! I am using (and learning slowly...) the Canon ...
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Old 05-04-2006, 18:46   #1 (permalink)
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So happy to be here & need a bit of H-E-L-P

So great to be a new part of this wonderful forum. Hello!
I am using (and learning slowly...) the Canon 20D. The lense I have on it right now is the Canon 100mm f/2.8EF USM Macro. I am wonder if any of you might help me with a query.
It is this:
I am photographing, on a flat surface, a chestnut seed, which is large and about
1 1/4" or 31.9mm in length. You probably know what they look like... So, in photographing them I need to include in this shot, a metric ruler.
The photo is taken, the seed is in focus, but the ruler is OUT OF FOCUS time and time again.
I realize I can fix this, but at the moment do not know how.
Might anyone help me?
My thanks are yours,
PBug
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Old 05-04-2006, 19:07   #2 (permalink)
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Hi, and welcome to the forums Sounds like you need to change the aperture size on your camera...this may help...

http://www.cambridgeincolour.com/tutorials.htm
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Old 05-04-2006, 19:08   #3 (permalink)
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Hi and welcome!

someone will be along with an answer for you soon im sure, though if you post the question in the correct forum section im sure it will get answered quicker!
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Old 05-04-2006, 19:16   #4 (permalink)
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Hello and welcome

Sounds like you have discovered the 'Depth of Field' is quite a short distance for close up (macro) photography. The wider open the aperture (or f2.8 with your lens) the shallower the distance that is actually in focus. there is a Depth of Field preview button on the 20D which will show you how your picture will come out. It is diagonally opposite the shutter button on the camera front.

Shut the aperture down to say f22 and you will get a bigger depth of field (more in focus depth) - use Av - Aperture priority mode and let the camera choose the shutter speed. The shutter speed may be slow so you may need a tripod and/or increase the iso setting.

Sometimes you can feel other replies coming while you type... bound to be some links to further reading
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20D. Kit lens. Canon 50mm 1.4. Sigma 150mm 2.8 macro. Tamron 28-75 XR Di. Canon 70-200 f4L . Canon 100-400L. 580EX.
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Old 05-04-2006, 19:22   #5 (permalink)
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I recently got a macro lens. Take a look at the test shots of a remote control that I took at f2.8 and f22 in this thread. Not great photos but shows the depth of field well
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Old 05-04-2006, 21:41   #6 (permalink)
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hello and welcome
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Old 05-04-2006, 21:47   #7 (permalink)
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howdy pbug welcome to the forum..
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Old 05-04-2006, 22:08   #8 (permalink)
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Quote:
Originally Posted by PBugJulie
about
1 1/4" or 31.9mm in length.
welcome to the forum, sounds like you need a smaller apature on your picture to increase the DOF.


i also love the way your "about" size is more accurate than most rulers ace!
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Old 05-04-2006, 22:09   #9 (permalink)
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Thank you so much for all your help! Whewwww!
Matty - I will take your suggestion and post in another forum section as well, good idea. I just thought I should start with the "Welcome" area.

RobertP - Tried the DEP button, and it seems all I get is a darkened preview...hmmm. Will have to play with this. As to the "AV" and the f22 setting, it worked for one shot wonderfully, then I couldn't get the shot again, no matter how I tried and now I'm going home. Has that ever happened to you?

ed34 - Hello!

Monkeydave - To you too, sir!!

Hope I can figure this out.
Best,
Your PBug
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Old 05-04-2006, 22:17   #10 (permalink)
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Hi Pbug

As the others have mentioned, it sounds like your shooting with a wide aperture, can you post the exif details of the shots?

I think i'd be setting the camera to P mode for the time being and making sure that you have as much of the frame in focus as possible before pressing the shutter release.

A good stable position would be helpful too, camera shake might well be causing the soft out of focus for you.
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Old 05-04-2006, 22:29   #11 (permalink)
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Quote:
Originally Posted by PBugJulie
RobertP - Tried the DEP button, and it seems all I get is a darkened preview...hmmm.
Yes it will be darkened but it will let you see what is in focus and what isn't. when you just look normally you only see a narrow depth of field that you have with the lens wide open for viewing. The f22 setting only happens when you press the shutter (or DOF preview buton)
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Old 05-04-2006, 22:59   #12 (permalink)
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Old 05-04-2006, 23:04   #13 (permalink)
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Welcome to the forums!

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Old 05-04-2006, 23:28   #14 (permalink)
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Welcome to the forums Julie.

DoF (depth of field) can be effected by how close the lens is to the subject,
So if you are closer to the subject on your latest attempts you may struggle
to get the ruler in focus.

If for example your subject was 1.5 metres away from the focal plain,
and you are shooting at f8, the near/far limits of acceptable sharpness
would be 1.47m/1.53m, this equates to 6cm of acceptable focus.
If you had reduced the distance of the focal plain to 1 metre,
the acceptable distances would change to 0.99/1.01m, this equates to 2cm of acceptable focus which could be the reason your ruler is not in focus.

If you don't understand the above, just move the camera further away from
the subject until you get the result you are after.

HTH
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Old 06-04-2006, 00:37   #15 (permalink)
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Hi Pbug
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Old 06-04-2006, 01:18   #16 (permalink)
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Welcome aboard!
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Old 06-04-2006, 08:57   #17 (permalink)
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Old 06-04-2006, 19:31   #18 (permalink)
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Hello All and Thanks so much for the L-E-S-S-O-N. So much to do and so little time, you know how it is. I know what I want, but I can't quite get it yet. I'm just in the studio now, so I will try what you all have suggested. I am shooting these seeds with a Manfrotto 3021Pro.
Hope this works! Thanks for your help.

BTW, Digitalfailure -
I don't have the EXIF Data (don't how to upload it here with finess...yet), but I do have the exposure time & F-stop:
#1 - 2"5 f/22 (just right)
#2 - 3"2 f/8 (yellow/red)
#3 - 1"3 f/5 (same as above)
#4 - 2" f5.6 (over exp)
#5 - 1"6 f/5 (same as above)
#6 - 1/5 f/2.8 (pretty good)
#7 - 3"2 f/9 (good)
#8 - 1"3 f/6.3 (pretty good, but OE)
#9 - 2"5 f/8 (OE)
Hope this helps. I'll be watching out!
Best,
Your PBug
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Old 06-04-2006, 19:45   #19 (permalink)
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Sounds like youre running it in full manual mode! You don't want to be doing that yet if you are having problems with what DoF is.

Just turn the dial until its on Av, then you only have to worry about the Apperture (f number). The camera will do the rest for you.

, oh, and welcome.
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Old 06-04-2006, 20:27   #20 (permalink)
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Thanks so SammyC!
"AV" it is.
Down to work now.
Best,
Your PBug
Oh, and thanks...again
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Old 06-04-2006, 20:42   #21 (permalink)
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Pbug
Don't worry so much about posting exif data, if your using something like photoshop the exif data can be viewed on screen. copy and paste the details into your post.
If your still in My pics, right click the file, select properties/summary/advanced and you'll see all the info of the shot.

Hope that helps.....and keep on clicking
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Old 07-04-2006, 14:29   #22 (permalink)
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Hello digitalfailure - Right, got it. Way easy. I will post.
Thanks,
Your PBug
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Old 07-04-2006, 22:15   #23 (permalink)
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Welcome!

Hope you get your pics sorted soon.
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