amderk wrote in post #17721915
ok so my 50mm lens becomes 85mm with my cropped frame-so I should be good?
Which aperture would you suggest with 4 kids and 2 parents?
With the focal point do you focus on the person in front or the back?
Field of view changes, but the focal length is 50mm no matter what. You should be fine though. As long as their arms or feet are not in the corners of the frame, you will not see any appreciable distortion. So don't worry about it. But do understand, it's 50mm, no matter the sensor size. Regardless, you're fine.
Aperture here depends on several things. Distance of you to them, and distance of them to the background. The closer you are to them, the thinner depth of field will be. The further away you are, the more depth of field there will be. So at 50mm, far enough away to do full body, F1.4 will likely produce enough depth of field (you'll be like 20 feet away to do that). I would probably stop down to F2 just to ensure all bits and pieces of the people are in focus since there are kids involved. Maybe even F2.8, again, just to ensure kids (who move a lot) are all in focus via depth of field. Would be a shame to have a kid with their face out of focus in the group because they leaned backwards or stepped back, etc.
If you're close up, for a not-full-body-shot, I would stop down to F4 or even down to F8, for an up close bust shot of a family of 6 or so with kids, again, to ensure those kids are in focus.
If you're far away, and they're filling the frame full body, you can get away with F1.4 and F2 comfortably at this focal length.
Focus on the closest-to-you person, let depth of field envelope the rest. Place them so they make a plate (flat line) so that your focus gets them all. If you stagger them or do layers with them (people in front of others) then you will want to stop down a bit, like I was saying, to ensure you get depth of field on them all, and you will want to focus on the front-most people still.