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Questions tagged [wide-aperture]

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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 ...
6
votes
5answers
5k views

What reduces blur from camera movement more: large aperture or image stabilisation?

In the reviews of lenses with image stabilisation systems there are quite often written the quality of its performance represented by the number of f-stops (2-4 f-stops). As far as I understand, it ...
17
votes
8answers
8k views

Will using a lens at max aperture (“wide open”) result in poor images?

I’m looking to add a second lens to my kit lens I got with my Nikon d7000. I have read several reviews on both the 35 and 50 mm lenses made by Nikon in particular that said using either lens at the ...
9
votes
5answers
3k views

What is the benefit of a wide-aperture lens if you stop it down?

As an example, say you have two lenses: 300mm f/2.8 being used at f/8 300mm f/4 being used at f/8 My understanding is that by definition the amount of light coming through the aperture means that ...
9
votes
5answers
1k views

How to precisely focus in self-portraiture with very wide aperture?

I've been trying to take some self-portraits, but I often have to struggle with the auto/manual focus. I don't miss by a lot, but I really want sharp focus in the eyes. I'm using a 50mm/1.8 around 2/...
10
votes
5answers
7k views

Which lens is sharper? The Sigma 18-50mm f2.8 or the Tamron 17-50mm f2.8?

Specifically: Sigma 18-50mm f/2.8 EX DC Macro (not the previous non-macro version. HSM is only on Nikon fit) Versus: Tamron 17-50mm f2.8 SP XR Di II LD VC Lens (not the cheaper one without ...
2
votes
1answer
293 views

Which characteristics should a wide-angle lens have for astrophotography?

I'm looking to buy a wide-angle lens for astrophotography, specifically on a Canon 450D (Rebel XSi). Which characteristics should I be looking for in a lens?
23
votes
7answers
10k views

For sports photography, should I use image stabilization or a faster lens?

For sports, I know that a faster lens would usually be considered more important than image stabilization, but what if, after selecting your shutter speed, your camera is picking apertures that don't ...
11
votes
3answers
508 views

Are fast lenses only fast when shot wide open?

Given two lenses with different max apertures but the same size image circle (say, full frame on a Nikon FX DLSR camera) and taking shots at the exact shutter speed and focal length under the same ...
0
votes
3answers
689 views

How can I make it easier to focus with my manual f/1.4 lens without making it worse for slower lenses?

I have a Canon 17-40mm f/4 and a Samyang 35mm f/1.4 lens, and a Canon 6D. The problem is that when I'm trying to focus at f/1.4, the DOF in viewfinder is much wider than on the photo so it's much ...
6
votes
1answer
2k views

Why does wide angle lens adapter + large aperture make images blurry?

I have a kit 18-55mm lens on my Canon. I also have a .45 wide-angle lens that I use on the kit lens. The results are fairly sharp. When I try to use the .45 wide-angle lens on the 50mm @ f/1.4, it ...
5
votes
2answers
1k views

What is a good rule of thumb to use large aperture for portraits vs showing more background?

I recently got a Canon 50mm and have found myself probably over-using the large apertures for portraits. I'm curious if anyone has a good rule of thumb for when to avoid it. My sense is that its ...
1
vote
0answers
49 views

Will 1 Inch sensor give same exposure at same aperture and ISO settings compared to APS-C sensor? [duplicate]

I know that APS-C is many times bigger than 1 inch and it dramatically effects shallow depth of field. But I was wondering if I'll shoot night city for example with same aperture and ISO setting on ...