Tagged Questions
3
votes
2answers
199 views
How can lenses with different focal lengths have the same angle of view?
I always assumed that there was a fixed relation between focal length and angle of view. But compare the technical data for the following lenses, all from the same manufacturer:
Canon EF-S 15-85mm ...
4
votes
1answer
115 views
What factor determines the largest usable sensor size with a certain lens?
Reading this excellent answer about field of view, focal length and sensor size a new question came to mind.
From the drawn diagrams it is clearly visible that for the same focal length an increase ...
7
votes
4answers
1k views
What lens focal length most closely resembles the human eye perspective?
For example, if I have a lens that is 16mm-50mm, which focal length would be the closest to the human eye view? (I don't have a camera yet, so I'm just curious).
Would 50mm be more zoomed in than ...
2
votes
2answers
180 views
Is lens focal length specified considering the effect of barrel distortion on field of view?
Given a NIKON 14mm f/2.8D ED AF Ultra Wide-Angle Nikkor Lens on a full-frame sensor, in theory the field of view is HFOV: 104° x VFOV: 81°. However this lens exhibits noticeable barrel distortion ...
14
votes
11answers
2k views
Will a 50mm f/1.8 work for general outdoor photography?
I want to know if it's advisable to use 50mm lens for general outdoor photography. I'm torn between 35mm and 50mm primes, and have read all the pros and cons. I understand that 50mm could be tight in ...
0
votes
1answer
78 views
How to calculate the new field of view from an existent one?
I have a photo having H x W (height x weight) pixels and I know, based on the EXIF, that it was shot at F1 focal length.
How many pixels I must crop (or add) in order to see how it would be the photo ...
5
votes
3answers
797 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 ...
1
vote
2answers
598 views
How far away can I be and still get a sharp subject with a 100mm lens?
If I have a 100mm lens, how far away can I shoot the subject? If I am shooting basketball, how far can I shoot the subject and still get a sharp picture?
4
votes
2answers
232 views
How rapidly does the focal length-equivalent image change by physically moving the camera?
I have recently begun moving from a Nikon APS-C DSLR to the Micro Four Thirds camera while also transitioning from using a viewfinder to using the LCD screen for framing my shots. Because of the size ...
4
votes
4answers
1k views
When would one choose a 50mm f/1.4 over 85mm f/1.8 (or vice versa) for portraits?
Say you are using a crop body, and you have both 50mm/1.4 USM and 85mm/1.8 USM lens in your bag. Now, you want to take a portrait where there is adequate light and space, and you have decided to take ...
4
votes
2answers
2k views
Does using a lens adapter change focal length?
Does using a lens adapter change the field of view?
I recently bought a Sony NEX-5, an extra Minolta MD 50mm 1.7/f lens and a MD to E-mount adapter and I was wondering, as the adapter increases the ...
5
votes
3answers
593 views
What is the formula for percent of frame filled at a specific distance and focal length?
I am thinking about buying a new lens specifically to take photos of distant targets (birds, bears, etc). I currently own the Canon 70-300 IS USM, which is a nice lens, but I find that if I want to ...
28
votes
4answers
5k views
What is “angle of view” in photography?
I read on the Lens Buying Guide @ neocamera:
Focal-length determines the angle-of-view seen through a lens for a
given sensor-size. With a full-frame sensor a lens gives the same
angle-of-view ...
12
votes
5answers
779 views
Why do we talk about focal-length when frame sizes are different?
I keep seeing people talking about focal-length of lenses without saying how large the frame is. Is there a more sensible way to talk about how much a lens “zooms”?
(I have seen so many adverts ...
14
votes
5answers
2k views
What focal length gives a “normal” field-of-view on APS-C cameras?
I wish to purchase a "standard angle-of-view" prime lens for my Canon Rebel, which has an APS-C sized sensor. Various articles note that the popular "nifty 50mm" lenses are a little too much of a ...
31
votes
10answers
2k views
What is the relationship between focal length and crop factor?
I'm reading that a 50mm lens is recommended as a first prime lens for DSLR owners as it's supposed to give a 'natural' perspective, but when used on (most) DSLRs, the view is cropped, as if you were ...
