Linked Questions

3
votes
2answers
136 views

Will a faster lens help getting a better (faster/more accurate) focus? [duplicate]

I read that with some cameras (but which?), using an f/2.8 lens or faster enables a more sensitive phase AF point, so there is quantum jump in AF accuracy. But that's not really my question :) My ...
19
votes
1answer
2k views

Why do even high-end cameras often still include normal (non-cross-type) AF sensors?

Modern cameras often use two kinds of AF sensor: normal, and cross-type. While normal-type AF sensors notably struggle focusing on high-contrast vertical lines, cross-type sensors, though more ...
8
votes
6answers
1k views

Does a lens with a bigger max. aperture focus faster than a lens with a smaller max. aperture?

The assertion by a well known photographer is that the Nikon 400mm f/2.8 set to an aperture of f/5.6 will let in 4 times the light compared to a Nikon 500mm f/5.6 lens set to f/5.6, keeping the ...
7
votes
2answers
5k views

How do I diagnose the source of focus problem in a camera?

Probably a novice question, but how do I correctly diagnose from a photo for what reason that camera wasn't able to focus properly? It can be any 1 of the following Unsteady hand Lens issue Metering ...
8
votes
2answers
6k views

If the focal plane is curved, should the outer AF points work correctly or front-focus?

Many (all?) lenses have a (slightly) curved focal plane. In general it's close enough to flat that you don't really notice it, but under certain conditions it may become apparent. As I understand it ...
9
votes
2answers
2k views

Are cross-type focus points more accurate, or just faster?

Do cross type focus points achieve sharper photos than horizontal points or do they just grab focus faster?
2
votes
4answers
370 views

Need help choosing a telephoto lens

I have a Canon kit, which comprises of 4 lenses: a 17-40 mm f4 a 50mm f1.8 a 100mm 2.8 Macro, and a 70-300mm IS USM (non L) I am looking for a telephoto/supertelephoto to replace #4 above. I am ...
0
votes
2answers
1k views

Why do my studio shoots usually end up fuzzy? [closed]

I have been into photography for about a year now. I am very grateful I can use a studio of the local photographer here. Together we have build a cyclorama wall and the photo shoots are going pretty ...
2
votes
3answers
518 views

Why is my Canon 70D's liveview autofocus much worse than the viewfinder's?

First of all I came across these questions already: My viewfinder won't autofocus but live view focuses well Canon 600D Autofocus not working when using view finder but working in live-view Why is my ...
2
votes
2answers
383 views

How can I effectively use the focus points (of Canon DSLR), to get accurate focus on a small subject?

I'm shooting birds with my Canon 1200D and 55-250mm lens. I know this is not ideal lens and focal length for bird photography. But I am new to this field and before investing on expensive equipment, ...