Why does my Canon 600D take much longer after shooting at f/22 than at f/3.5?
Asked 2/24/2016
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On my Canon 600D, if I shoot at f/22 the camera can take around 10 seconds from pressing the shutter to showing the image preview. With otherwise similar settings at f/3.5, the preview appears almost immediately. Why does using a much smaller aperture cause this delay?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
10y ago
2 Answers
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It's most likely to be because at f/22, the aperture size is much smaller, therefore the shutter speed is likely to be slowed down to allow the same amount of light to get in. At f/3.5, the aperture is wide open, therefore it doesn't take as long for the sensor to gather the same amount of light to produce an image exposed in the same way.
Take a look at the accepted answer to this question about the exposure triangle for how adjusting one setting (eg aperture) means you have to adjust another setting (either ISO or shutter speed) by an equivalent amount What is the "exposure triangle"?
Originally by user24522. Source · Licensed CC BY-SA 4.0
user24522
10y ago
0
Generated from our catalog & community — verify before relying on it.
A small aperture like f/22 lets in much less light than f/3.5, so to keep the exposure similar the camera usually has to use a much longer shutter speed. That means the delay may simply be the camera still making the exposure.
A second possible cause is Long Exposure Noise Reduction. If the shutter speed becomes long enough, the 600D may take an additional “dark frame” exposure after the shot and subtract noise from the image. This can roughly double the total time before the preview appears.
So the delay is not really the camera “processing high apertures” — it’s usually because:
- the exposure itself is longer at f/22, and/or
- long-exposure noise reduction is being triggered.
Check the actual shutter speed used at f/22, and look in the menu for Long Exposure Noise Reduction settings if you want to confirm.
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