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Depth Of Field Preview Button  
User currently offlineLugonza_2001 From Spain, joined Oct 2001, 315 posts, RR: 1
Posted (12 years 1 month 2 days 16 hours ago) and read 2661 times:


I just got an N80, which features a depth of field preview button

Do you find this feature useful? I just do not know how to process the information i get through the viewfinder when i put the button, the only thing i see is a darker image.

Any help will be very appreciated.

Thank You!

4 replies: All unread, jump to last
User currently offlinePaulinbna From United States of America, joined Feb 2003, 1114 posts, RR: 5
Reply 1, posted (12 years 1 month 2 days 16 hours ago) and read 2631 times:
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You need to actually shot some thing you can see like say a plant (About 3 feet away) in the fore ground and a distance shot like a field.

What you do is set the camera to F-20 then focus like you normally do and press the DOF button. You will see a darker image but the plant and the field will be in focus. You can also see it in some other examples but you will see it more in the above example.

Canon 50D user; 100-400 MM L IS 10-22 MM, 60MM Macro
User currently offlineCraigy From United Kingdom, joined Jun 2001, 1118 posts, RR: 0
Reply 2, posted (12 years 1 month 2 days 5 hours ago) and read 2558 times:


Since the depth of field is proportional to aperture, pressing the DOF preview button closes the aperture to show the real DOF, but it limits the light, do the image is darker.

For example, if you set an f2.8 lens to f8, the lens still stays wide open at f2.8 until you take the shot, when it momentarily closes to f8. This is so that it can do the autofocus with as much light as possible.

That is why most cameras will not autofocus with lens and converter combinations which push the maximum aperture towards f8 - not enough light.

I used the DOF button more when I was starting out with an SLR - now I have a feel for what aperture to use I don't bother much.

If DOF was critical to a shot, I would take test shots and review them on the LCD screen now that I have changed to a DSLR.


User currently offlineLHSebi From Germany, joined Jan 2004, 1049 posts, RR: 7
Reply 3, posted (12 years 1 month 1 day 10 hours ago) and read 2495 times:

Is that what that button on the front of the 300D is for? There is that small button at about 4 o'clock (front view) on the side of the bit where the lens gets screwed into. Is that the same? How exactly is it used? Thanks in advance.


I guess that's what happens in the end, you start thinking about the beginning.
User currently offlineStaffan From , joined Dec 1969, posts, RR:
Reply 4, posted (12 years 1 month 1 day 9 hours ago) and read 2491 times:

As Craigy wrote, it closes down the aperture to the one that is selected to let you preview how much depth of focus you have.


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