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01/26/2004 07:19:58 PM · #1 |
I just got my 10D today and I love it. But I am having problems getting a sharp focused image. Pictures that I just took with my E10 of the same objects came out sharp and clear, but the 10D seems to blur the images quite a bit. Is this the result of the metering? or type of focus?
I am using a Sigma 28-300 mm lense f4.0. Could it be that I am focusing too closely to the object with my zoom lense? I can't test out an outdoor picture since it is night time so I am in my room focusing on images about 1 Meter away from me. If someone has any hints as to what may be causing the blurring, please let me know.
Oh yeah, I am using the flash too.
One more thing, my E10 used to focus on the center parts when i press the shutter, but my 10D seem to focus at all parts except the center point. Can someone explain to me how to get that focus again? I am pretty frustrated with it right now.
Thanks, and this is my first posting, hopefully after getting this camera, I'll start taking pictures for the challenge. :)
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01/26/2004 07:24:00 PM · #2 |
What aperture are you using ?
You'll find that with a larger sensor camera, the aperture really makes a difference.
Are all of your shots blurry, or just part of the scene ?
There should be a button that looks like [ . . . ] that lets you change the focal point - this should be explained in the manual (which is well worth reading...)
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01/26/2004 07:32:29 PM · #3 |
| Okay, i'll check my aperture. I was playing around with f4.0 and then around f8.0, with the flash set on. I am getting better images now. Thanks for the tip. |
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01/26/2004 08:03:17 PM · #4 |
What speed ? Using a tripod ?
If you are at 200mm, it's like a 320mm on the 10D, meaning that your speed needs to be, globally, faster than 1/320s (general rule only) and that probably 1/500 s or faster will guarantee you a sharpshot.
If you are using your flash, what were your settings on the 10D ?
Lionel |
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01/26/2004 08:15:04 PM · #5 |
I think I figured out something here. My E10 was taking pictures at 1/100 with f2.4. My 10D was taking it at 1/20ish at f3.5 which certainly makes a difference. I don't think i can hold my camera steady by hand like this, esp when zooming in to about 200mm, which like Lionelm said is around 320 on the 10D.
I'm still very new to all these functions, but is there a site of some sort that I can read up about the equivalences of shutter speed, aperture and zoom and how they all interrelate? I read somewhere that if you are zooming to like 200mm, you need at least 1/this amount to make it stable. Does anyone know where I can read more tips like these?
Thanks a lot. |
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01/26/2004 08:23:40 PM · #6 |
I think what you're referring to is an accepted guideline that most people have heard that says you can handhold a shot up to the inverse of the focal length. Thus, if you're shooting a shot at 200mm then you would need at least 1/200th of a second or faster given a certain amount of light. Likewise, a 50-85mm shot might be OK if you were as slow as 1/60th of a second. I'm not terribly familiar with any grand name for this but you might want to lookup Sunny 16 as a rule/guideline.
Message edited by author 2004-01-26 20:24:10.
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01/26/2004 09:04:24 PM · #7 |
Sunny 16 doesn't really take in to account the lens you are using.
It just says, that the base exposure for a shot, on a sunny day,
is 1/ISO at F16
So ISO 100 would be 1/125 at F16
ISO 200 would be 1/250 at F16 and so on....
You can then use the reciprocity law to adjust for the particular aperture/ shutter speed you want.
The general rule of thumb for handholding is that you can only hand hold a lens of focal length x at 1/focal length or faster a shutter speed.
Due to the magnifying effects of the digital SLR crop, this actually
means 1/effective focal length rather than the 35mm focal length too.
This is just a general rule of thumb and is obviously very dependant on your own personal idea of what sharp actually is and how good your lenses. Personally I found doing some tripod tests and large prints, that I want to go to at least twice the focal length to get acceptably sharp prints (which means I use a tripod a whole lot more)
YMMV, and for small prints it is a lot lower tolerance. |
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01/27/2004 11:25:44 AM · #8 |
Thanks everyone for the help. I finally got my camera to focus correctly. Thought I was going blind for a while there. There's just so many functions to this baby... drooool
Unfortunately I'm going to get another week of snow/rain. I want to test it out!
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