hey phelan. yep, i understood that part and nick's explanation. what didnt' come to me was that up to about 20mm length the rear DOF is infinite vs using a longer lens based on the DofF calculator. which means i shouldn't need to use a large f/stop number to get the tail of my car in focus.
here's wat the calc says based on me standing 3meters from the car using f/5.6
18mm near focus limit 1.17m DOF: infinite /far focus limit is infinity
20mm near focus limit 1.33m DOF: intinite /far focus limit is infinity
23mm near focus limit 1.53m DOF: 65.18m /far focus limit is 66.72m
that's a lot of dept of field i can use at f/5.6 with a short lens.
on the contrary if i use a 55mm setting...
55mm near focus limit 2.56m DOF: 1.02m /far focus limit is 3.594m
yah, so you're saying that the camera's center is focus based on apeture and DOF and you can selectively focus using the REDDOT but the apeture setting will mandate how well the camera can focus within that DOF. i think i understand how this thing works now.
forgot to reply on your question about flash. i dont have external flash, just the one that pops up on my D3100.
i dont intend to go deep into photograpy. i already have another expensive hobby (music) besides my car which not only eats at my wallet but my time and determination as well.
photography is more like just a icing on the cake for my car hobby.
