DOF question +1

[OceanRider]

Hi all just a quick question on DOF

What is a the general f stop to use to insure sharpness on a small group of people (2-4 ish) in a portrait? I have hit the web and can't seem to get clear cut answer on this. I wonder if my A-DEP button works well for this(?) +

One more quick quetion... I am very puzzled about. I have 75-300mm Canon zoom, f 4-5.6 ultrasonic...cheap lens I know... but all I can afford right now.... sometimes I can access the f4 and sometimes it will only go as low as the f5.6 What gives? I would think that I could access the f4 all the time. Any ideas?

Thanks for your time guys and gals

Joel:D

[snibbetsj]

The 75-300 f4-5.6 has the maximum aperture of f4 at 75mm and f5.6 at 300mm. Between 75 and 300 it will vary between f4 and f5.6. I think it decreases geometrically but I'm not really sure. It should say in the manual.

Have fun.

[snibbetsj]

BTW, the depth of field button will show you what is in focus. If you press this, the red squares will indicate what is in focus. I usually use f5.6-f8 for 4 or less people, depending on the focal length of the lens and how the people are arranged.

[snibbetsj]

I'm trying to get my post count up :rolleyes:

[OceanRider]

thanks guys, great as usual. Thats interesting, I never knew that. >>>Between 75 and 300 it will vary between f4 and f5.6<<<

>>>>the red squares will indicate what is in focus,<<<< Really eh. I have never noticed this...I don't use the DOF preview botton because all it seemed to do was darken the viewfinder (depending on how much I stopped down) which didnt really help me asertain the DOF. I will look for these red squares. Thanks

[DocFrankenstein]

>>>>the red squares will indicate what is in focus,<<<< Really eh
Even if they do, I wouldn't suggest using it as an indicator... cause "in focus" is subjective.