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DPChallenge Forums >> Tips, Tricks, and Q&A >> Dimage 7i DOF at High Shutter Speeds
Showing posts 1 - 7 of 7, (reverse)
08/16/2004 06:40:27 PM · #1
I have been enjoying the learning curve with photography and have spent several enjoyable hours taking loads of macro pics with the Dimage 7i.
However if I am trying to use the higher shutter speeds (1/750 and above) it seems to limit me to F3.5

This is really limiting as the DOF seems REALLY tight.
QUESTION: Is there any way of expanding this, even slightly?

Below (i hope) is an effort from this weekend which could have looked a lot better if I could even stretch a few mm more into focus:

08/16/2004 06:43:14 PM · #2
This is because the lower f-numbers let more light in to the camera, so to avoid underexposing the shot, the camera needs to lower it to let enough light in at 1/750. I'm not sure if you can on that camera, but try turning the ISO up, or see if there is a full manual mode where you set it all manually. You might get underexposed shots but they can be saved to a certain extent on photoshop, whereas you can't sharped an OOF background :)
08/16/2004 06:53:58 PM · #3
Thanks Konador. The shot of the fly (sorry the thumbnail didn't work...) was with almost all settings at manual (including focus), however the ISO was on auto which set it at 100. I'll be sure to try upping the ISO the moment the rain lets up.... which hopefully will be this year. - Dublin Ireland
08/16/2004 06:56:12 PM · #4
' . substr('//images.dpchallenge.com/images_portfolio/16834/thumb/97824.jpg', strrpos('//images.dpchallenge.com/images_portfolio/16834/thumb/97824.jpg', '/') + 1) . '
Ok, so that's the first time I've got a thumbnail right...
08/16/2004 07:02:46 PM · #5
Some Compact cameras has this issue to protect you from "break the rules". Apperture are a physic relation to the lens in use, in some cameras that have only one lens, to inprove the shutter speed the designers used the electronic shutter mixed up or not with a mechanical one. That is why some cameras has to restrict some appertures at certain speeds. Mine CP5700 do it at 1/4000, limiting me to minumum f3.5 regardless of my focal lenght.

That is why I want a DSLR...
08/16/2004 07:09:26 PM · #6
1/4000 sounds pretty impressive though. So far I have only been able to use 1/2000 in direct sunlight or with reasonable flash.
(so it's not my imagination that the sun doesn't shine as bright in Europe as it does in Africa...) :D

While I was impressed with the narrow DOF when I first starting using the Dimage 7i, it has become a bit limiting as I try to experiment some more. I think I need to start saving for an SLR too. :(

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08/17/2004 12:27:39 PM · #7
A lot of the non-slr cameras only have a single mechanism to do both aperture and shutter. So when you take a picture, the shutter will open up to the f stop you want and then stay open long enough for your exposure and then close back. But as this is a mechnanical device it takes some amount of time to open fully and then to close back. The fastest shutter speeds are faster than the shutter can open fully and close back, so the camera limits you to smaller apertures
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