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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 16 Nov 2007 (Friday) 03:27
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canon 400 d problems

 
tonylong
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Nov 16, 2007 13:53 |  #16

bisisica,

If you follow my suggestion above, you can be in P, Av, Tv or M and use exposure compensation. P&S cameras would be challenged by that scene as well. If you pointed the camera into dark shadows it would make the shadow areas look great but the wall would look too blown out. Try my suggestion and see how it works!


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number ­ six
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Nov 16, 2007 14:08 |  #17

form wrote in post #4327894 (external link)
Sunny f16 shouldn't be used for 35mm-format Digital SLRs. Use sunny f/10 or f/8 and set to ISO100.

Eh? I've found the "sunny 16" rule works perfectly on my DSLR. Recently I took a shot of a sunny landscape with lots of variation (sky, clouds, ocean, mountains, trees) in the picture and the camera's meter chose 1/400 at f/16 - my ISO was 400.

The exposure was perfect.

Just like the rule says.

-js


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bisisica
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Nov 17, 2007 05:27 as a reply to  @ number six's post |  #18

i have a canon 70-200 f4 L lens but can't get very sharp results. when i use manual focus( but this is time consuming) i end up with sharper pictures. is this normal?




  
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bisisica
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Nov 17, 2007 05:38 |  #19

bisisica wrote in post #4331645 (external link)
i have a canon 70-200 f4 L lens but can't get very sharp results. when i use manual focus( but this is time consuming) i end up with sharper pictures. is this normal?

here is an example taken using a tripod. the first shutter 1/25, aperture f4, iso 100,focal lenght 185mm, program mode aperture priority, metering mode average. i had better results using my PS......i'm sorry for the bad sample:(((


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bisisica
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Nov 17, 2007 05:40 as a reply to  @ bisisica's post |  #20

...




  
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gofer
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Nov 17, 2007 06:13 as a reply to  @ bisisica's post |  #21

That image does indeed look poor. You should be able to get much better results than that with a 400D plus 70-200 F4. What file size are you using? Have you tried shooting in RAW format.


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bisisica
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Nov 17, 2007 07:34 as a reply to  @ gofer's post |  #22

the image above was resized. i don't know how to maintain the image quality...yet:)




  
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PhotosGuy
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Nov 17, 2007 07:52 |  #23

here is an example taken using a tripod. the first shutter 1/25, aperture f4, iso 100,focal lenght 185mm, program mode aperture priority,

That's fine if you want the effect that you got. But if you wanted something else, like more of the leaves in focus, then you have to take control & put in the settings you need to get it.

Again, "First set the f-stop & shutter speed you need. Then adjust the ISO. Need an exposure crutch?"
And these:

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http://www.photonhead.​com/simcam/ (external link)

Shooting by selecting settings yourself (external link)
Notice the background change when you use his "Shutter and Aperture" settings!


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gofer
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Nov 17, 2007 07:53 as a reply to  @ bisisica's post |  #24

I wasn't refering to the size you re-sized your picture to in order to post on the forum, I was refering to the file size you have the camera set at ie. 'L', 'M', 'S', 'RAW' etc.


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Overkill
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Nov 17, 2007 08:00 |  #25

bisisica wrote in post #4331660 (external link)
here is an example taken using a tripod. the first shutter 1/25, aperture f4, iso 100,focal lenght 185mm, program mode aperture priority, metering mode average. i had better results using my PS......i'm sorry for the bad sample:(((

Was their a wind blowing! (movement of the leaves at 1/25 is a problem!


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gofer
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Nov 17, 2007 08:06 as a reply to  @ Overkill's post |  #26

bisisica, these were taken with my 400D fitted with a 70-200 f4:

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Not the most technically correct images it's true but they do show what is easily possible with your gear.

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bisisica
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Nov 17, 2007 08:31 as a reply to  @ gofer's post |  #27

i have the lens for 3 days. i see your pictures are taken in bright light. i am still waiting for the sun to come out:) does she sharpness of a picture have anything to do with the light?...sunny day....sharp picture?( i am not reffering to a faster shutter speed....and no movement...)




  
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gofer
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Nov 17, 2007 09:01 as a reply to  @ bisisica's post |  #28

Obviously bright light allows for faster shutter speeds and therefore less chance of the dreaded 'shakes', but providing the image is properly exposed and the camera properly supported light shouldn't effect the sharpness of an image - although sharpness may be perceived as being better in brightly lit images due to the increase in contrast.


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rkkwan
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Nov 17, 2007 10:27 |  #29

When I had my 400D/XTi, I found myself spending too much time second-guessing what the Canon evaluative metering mode is "thinking". Finally, I decide it's not worth my trouble and just use center-weight most of the time. Partial during some situation, and also adjust compensation when required. I learned photography using center-weight, so that's intuitive to me.

That's why there are all these metering modes. Different users, different scenarios.

Another thing is that the 400D's evaluative metering really wants to protect highlights. My theory is that they assume most users will shoot in JPEG and if they blow the highlights, they're gone. That's a valid point, but 1) straight out of the camera, many shots are underexposed; and 2) if you shoot RAW, you can pull back some of the blown highlights anyways.

Those are additional reasons why I didn't use evaluative metering with my 400D/XTi, and still don't with my 40D.

---

As for the Sunny 16 rule. Metering is valid, but most lenses are most sharp with least aberration at f8-11. f16 doesn't give one the best IQ.

---

As for that 185mm picture at 1/25, I hope there's no air movement at all and your tripod is sturdy enough for the 40D + 70-200/f4 combo. It's a dark scene and that shutter speed is very slow. You already maxed out the aperture, so you need to bump up your ISO. Moving from 100 to 400 will mean upping the shutter speed to 1/100.

You also mentioned you get better results with manual focus. That means autofocus is not doing its job. What mode are you in and which focus point? For a picture like that, you should be using one-shot mode and use only center point focus. Sometimes refocus will also help.


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canon 400 d problems
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