Linked Questions

3 votes
2 answers
239 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 ...
xenoid's user avatar
  • 21.5k
11 votes
2 answers
8k views

How do I diagnose the source of blurry photos?

Probably a novice question, but how do I correctly diagnose from a photo for what reason that camera wasn't able to focus properly? Or tell if the image was blurry for some reason other than incorrect ...
MnZ's user avatar
  • 422
19 votes
1 answer
3k 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 ...
Jules's user avatar
  • 658
8 votes
6 answers
2k 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 ...
Michael Davis's user avatar
9 votes
2 answers
7k 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 ...
drfrogsplat's user avatar
  • 5,714
9 votes
2 answers
5k 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?
gordon's user avatar
  • 93
2 votes
4 answers
401 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 ...
Suri's user avatar
  • 23
0 votes
3 answers
2k views

Camera auto-focus issues with Tamron 150-600mm

I rented a Tamron 150-600mm f/5-6.3 G1 to test it before buying. I want it for bird and wildlife photography. My camera is Nikon D5600. While testing today on few birds sitting on a distant branch, I ...
RKh's user avatar
  • 309
2 votes
3 answers
2k 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 ...
confetti's user avatar
  • 881
2 votes
2 answers
584 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, ...
ecthiender's user avatar