Linked Questions

14
votes
5answers
33k views

What does the f-stop printed on the lens refer to?

I have read this,so I know what an f-stop is, but what does the number on printed the lens signify? Is this is the maximum f-stop, the ideal, or something else?
15
votes
7answers
837 views

Does lens speed still increase meaningfully when the physical aperture is larger than the sensor size?

This question came to me this morning, thinking about 50mm lenses. I have the Pentax 50mm f/1.7 (manual) and it's a very nice lens, but would be considered (relatively) slow on 35mm film, and many ...
21
votes
4answers
6k views

Do the same camera settings lead to the same exposure across different sensor sizes?

Let's say I have a micro-4/3rd camera and a full frame camera, both set to 1/60 at f/2.8, taking a picture of the same scene in the same lighting. Will the exposure be the same across both cameras ...
15
votes
5answers
5k views

Will a dSLR and compact camera produce the same bokeh output at f/2.0?

Will a Nikon D80 + 50mm f/1.8D and a Lumix LX5 set both at an aperture of f/2.0 (50mm @ f/2.0 for D80 and 24mm @ f/2.0 for LX5) have the same bokeh ouput? I plan to get the LX5 as a second camera, and ...
14
votes
6answers
11k views

How do I find a point-and-shoot camera specifically for bokeh / a very shallow depth of field?

I will be getting a point-and-shoot camera for taking portraits and only portraits. Specifically portraits with a shallow depth of field. Groups portraits sometimes. It's just too much work to add ...
12
votes
3answers
8k views

Why don't comparisons of aperture take sensor size into account?

When one compares focal length, many times we use the 35mm equivalent length. A 50mm lens on an APS-C sensor camera(1.6x) would be a 80mm equiv. length on a full frame camera. But when we state the ...
17
votes
3answers
3k views

What is the “Circle of Confusion?”

I know that when I want to calculate Depth of Field by hand one of the variable elements in that equation is the Circle of Confusion. In layman's terms, what is the "Circle of Confusion," how do I ...
2
votes
7answers
16k views

Do I use the crop factor in calculating aperture size and area?

How do I calculate the aperture size and area, considering an 35mm equivalent focal length value and non-equivalent aperture f-number (in terms of exposure, no multiplication of the crop factor of the ...
3
votes
3answers
1k views

Confused about T-stop number. Does it account for crop factor?

I understand that a T/stop number deals with how much light is let in, instead of the sensor size vs. aperture like the f/stop number. However, what I haven't found is whether or not that T/stop ...
9
votes
5answers
980 views

Would a 50mm lens on a Canon APS-C crop produce the exact same image as an 80mm lens on a full frame camera?

Scenario: I put a 80mm lens on a FF camera and take a picture I put a 50mm lens on a Canon APS-C crop camera (1.6x crop) and take a picture Going by the 1.6x crop, I understand the fields of view of ...
7
votes
3answers
1k views

Why do depth of field calculators show *more* DOF for larger formats with the same lens parameters?

I thought I had a pretty good seat of the pants understand of DOF. But I've been playing with DOF calculators and it's giving me results that don't line up with my practical experience, so I'm ...
9
votes
3answers
6k views

Does a 35mm prime lens show the same bokeh as a 50mm prime lens on a cropped sensor?

I came to know that a 50mm prime lens on a cropped sensor behaves like an 75mm prime lens. So, does the 35mm prime lens behave like a 50mm prime lens on a cropped sensor? If yes, then will it show ...
1
vote
10answers
10k views

Is an aperture range of 3.5-5.6 shallow enough to provide great bokeh on a cropped sensor?

I have been primarily shooting with a Canon 18-135 f/3.5-5.6 for several years now, and I am not completely satisfied with it. The problems I have are: A bit too wide on the low end A bit too short ...
5
votes
3answers
1k views

How does using a lens with some focal length on a full frame camera differ from using a lens with “equivalent” focal lens on a crop camera?

As an example, a 35mm lens on a crop body (such as Nikon DX) is said to be "equivalent" to a 50mm lens on a full frame body. Equivalent here means that they will have the same field of view, but what ...
7
votes
3answers
2k views

What's the formula for f-stop equivalence between different sensor sizes?

The famous Group f/64, to which Ansel Adams and several other prominent photographers of that day belonged, were named that because of the f-stop: The term f/64 refers to a small aperture setting ...

15 30 50 per page