Does super wide = Super slow SLR process speed?

Graeme Edwards

Graeme Edwards

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Graeme
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Hi Guys.

A quick question.....

My super swish girlfriend bought me the Sigma 10-20 wide angle for my birthday last week.
Since having a very quick play, it seems that when I use this lens, process times are really slow. A lot slower than the standard kit lens.

Is this common of all wide angles, or is it just the way it goes for an old Canon 350D.

I cant see how it would make much difference, but it does. Its been very cold here, and im not sure its that, but even in the cold, the 10-20 is making the 350D slow.

Any ideas?

Also, if you have any tips to get the best from the lens, I would be much appreciated.

Many thanks.

Graeme.
 
Shouldn't make a difference at all, the sensor in no way has any more info to process than usual! Unless maybe it's having trouble encoding the lens info into the EXIF... but that seems highly unlikely...
 
Yeah, the camera processing. I take the picture, the CF light flashes for about 3-10 seconds.

I couldn't figure out how it could make any difference, and thought the same as you purple.... The sensor is the same, all the lens is doing , is pulling more onto the view finder thingy.

Doesnt happen all the time thought.
 
Have you got long exposure noise reduction turned on, and shooting at long shutter speeds? That locks up the camera for the same time as the exposure while it works its magic. Nothing to do with the lens though.
 
If you're shooting long shutter times or high ISO it could just be the noise removal at work (which takes time)?
 
Like the others said, the lens shouldn't make a difference to the camera processing.

Are you sure you've not changed any other settings? Shooting in raw rather than a small jpeg?
Long exposure noise reduction might cause this if you've got it available?

Maybe you've used a slower CF card?
 
Ummm, I dont remember selecting that function but its very possible.

The shots where on 30 second shutter speeds, ISO around 100-200.
 
Yep - 30 second shutters will significantly extend the image processing time (generally roughly equal to the shutter time).
 
Graeme Edwards said:
Ummm, I dont remember selecting that function but its very possible.

The shots where on 30 second shutter speeds, ISO around 100-200.
Click to expand...

That's you answer. You might have had it turned on for ages and not noticed it until you used longer speeds. Custom Function 02.
 
Hmm, that sounds about right.

Is this to help make the images sharper?
One thing im never happy with is how sharp my images are.

Is this a spin off for another thread? Probably.

Thanks for the info so far.
 
Graeme Edwards said:
Hmm, that sounds about right.

Is this to help make the images sharper?
One thing im never happy with is how sharp my images are.

Is this a spin off for another thread? Probably.

Thanks for the info so far.
Click to expand...

If anything, some strong noise reduction systems reduce sharpness, but it's really very slight, and well worth it for the usually dramatic reduction in noise.

If you're having problems with sharpness, ten to one it's a technique issue. Camera shake is the commonist culprit, and innacurate focusing.

Rule of thumb for shutter speed is to never let it be longer than the focal length x crop factor, ie with 30mm lens, 1/30sec x 1.6 = 1/48sec. If you find yourself using long shutter speeds a lot, raise the ISO as high as you dare, use a low f/number, and consider upgrading to an Image Stabilised lens.
 
Yeah I have no doubt it could be a technique issue. And im sure I could take a few simple steps to improving, I just need some pointers.

How do I know my crop factor, is this standard for certain types of cameras.

My tripod is rubbish, for sure, new one after crimbo.

I find my tiny LCD screen doesnt help to figure out if ive got it right.
 
For sure the longers exposures with noise reduction turned on will mean your camera locks out for the same length of time as the exposure was - but does it exibit the same behavour with the kit lens under the same conditions?
 
HoppyUK said:
Rule of thumb for shutter speed is to never let it be longer than the focal length x crop factor, ie with 30mm lens, 1/30sec x 1.6 = 1/48sec. If you find yourself using long shutter speeds a lot, raise the ISO as high as you dare, use a low f/number, and consider upgrading to an Image Stabilised lens.
Click to expand...
If he is doing 30 second exposures then we'll clearly be using a tripod to an image stabilised lens will be no good because you'd have to turn it off anyway. Can you even get image stabilised ultra wide angles lenses like the Sigma 10-20mm? :shrug:
 
A 30 second shot will take longer to save than normal but shouldn't take longer than a 30 second shot with another lens at the same zoom length or taking in the same scene.

30 seconds is very long though but I assume that you've picked this length of exposure for a reason.

BTW. Your camera is a x1.6 crop.
 
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