53
votes
How to zoom with Canon 77D with Canon 50mm 1.4 lens?
How to zoom with Canon 77D with Canon 50mm 1.4 lens
To zoom in, step forward.
To zoom out, step back.
It's often called zooming with your feet.
- 172k
42
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Accepted
How to zoom with Canon 77D with Canon 50mm 1.4 lens?
You can’t. The 50mm f/1.4 is a prime lens, which means it has a fixed focal length, or fixed field of view. This is what some people call a “sneaker zoom” lens, where you as the photographer have to ...
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12
votes
Accepted
Why doesn't the focus distance at which my lens has magnification 1 match the formula?
The equation assumes a simple single element lens that is bilaterally symmetrical. The camera lens, to mitigate the 7 major aberrations (shortcomings that degrade) is constructed using several ...
- 37.7k
12
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How to estimate pixels per degree for an image from a camera phone using EXIF data?
I assume this is a still frame from a video, because 16:9 is a common video ratio. In order to maintain constant frame size, "digital zooming" needs to be reinterpolated. Thus, yes, you need to ...
- 31.6k
9
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Why doesn't the focus distance at which my lens has magnification 1 match the formula?
first of all, kudos on your effort to break a photography problem down to first principles.
The discrepancy you've observed stems from a common oversimplification. Your 100mm Lens is actually what ...
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6
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If the zoom number doesn't tell me magnification, what does?
I think the answer you seek is in terms of "angular magnification" as it is used with binoculars.
In the world of binoculars there is a number that is referred to as "magnification". For example a 10&...
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6
votes
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How does a teleconvertor affect magnification ratio?
From Nasim Mansurov, the author and founder of Photography Life.
Teleconverters do not affect optical characteristics of lenses – they only magnify the center portion of the frame. This means that ...
- 172k
5
votes
Accepted
Macro with crop body
The maximum magnification is an expression of the size as it is projected onto the recording medium. That is, it is a reference to the size of the projection on the surface of the sensor or film.
If ...
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5
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Panasonic Lumix FZ1000 - How does it compare to binocular magnification?
Leica 10X binoculars show a field-of-view of 6.7°. This is slightly wider than a 400mm lens on a full-frame camera.
The Panasonic FZ1000 has an equivalent 25-400mm zoom, so at its maximum it will ...
- 102k
5
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Does changing the focal length change the depth of field for the same magnification?
Depth of field is only effected by aperture and magnification. (magnification is the result of focal length and distance)
Changing the focal length while keeping the same aperture and magnification ...
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4
votes
If the zoom number doesn't tell me magnification, what does?
Zoom is zoom and magnification is magnification.
Apples and oranges.
Optical Magnification is the ratio between the apparent size of an object (or its size in an image) and its true size.
It is ...
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4
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50mm and 100mm macro lenses difference at the minimum focus distance?
When a macro lens has a reproduction ratio of 1:1 an object with a given size will be reproduced at the image plane at the same size. This is irrespective of the focal length. The only difference is ...
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4
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Macro with crop body
The magnification will be 1:1, unchanged with that lens at 1:1 on any body.
The only difference is that the cropped body will crop the image.
Say you photograph some 15 mm object at 1:1 with both ...
- 12.8k
4
votes
Can viewfinder type make an appreciable difference in manual focus?
Absolutely, yes. But possibly not in the way you're thinking.
The obvious disadvantage is the challenge of getting sharply focuses images while focusing manually. I have great vision, but I still ...
- 50.5k
4
votes
Does higher MP magnify the subject?
No, more megapixels does not magnify the image (meaning the subject image). Focal length (zoom) magnifies the subject size in the image. Magnify is a word referencing the subject size within the ...
- 12.8k
4
votes
Does higher MP magnify the subject?
The standard meaning of optical magnification/magnification ratio has to do with the physical size of the object and the physical area of the image plane (film/sensor) that it occupies when recorded.
...
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4
votes
Magnification percentage meaning
The percentage is the scaling applied to render the image onto the display. The size of the image on screen will therefore depend on your screen size. Conceptually this can be thought of:
100% means ...
- 102k
3
votes
Can viewfinder type make an appreciable difference in manual focus?
A larger viewfinder might help slightly, but probably not as much as you hope. You probably won't notice any difference in focusing ability between a pentamirror and pentaprism.
The best way to ...
- 31.6k
3
votes
Accepted
Proper method to measure the magnification of a reversed lens
Photograph a normal ruler, mm scale preferred. Then if your sensor is 24 mm wide (camera specs should say), and if the image shows say 20mm of that ruler, then the magnification is 24/20 or 1.2x (...
- 12.8k
3
votes
How can I calculate what the effect of an extension tube will be?
Cambridge in colour has an online magnification ratio calculator.
And to quote the web site:
An extension tube increases lens magnification by an amount equal to the extension distance divided by ...
- 514
3
votes
Can we combine extension tubes and diopters for greater macro magnification?
Yes, macro photography can be done by using and combining multiple cheap methods (diopter rings, extension tubes and reverse mounting lenses) and here is an amazing example of what Alexey Kljatov ...
- 341
3
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What kind of bellows should I use for 5x magnification with a 100mm lens?
Using this Extension Calculator it looks like it may be difficult to find a bellows with the amount of extension you need.
To achieve 5:1 magnification with a 100mm lens, you need to have a lens ...
- 11.9k
2
votes
Difference between focal point and distance away from object?
Remove the supplemental lens from the phone-camera. On a sunny day, hold the lens between a white sheet of paper and the sun. The lens will project a tiny image of the sun on the paper. You start with ...
- 37.7k
2
votes
Why doesn't the focus distance at which my lens has magnification 1 match the formula?
There are two reasons why the subject-to-image distance is not
40 cm at unit magnification:
the focal length of the lens may not be 100 mm
the distance between the principal planes may not be zero.
...
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2
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Why doesn't the focus distance at which my lens has magnification 1 match the formula?
Most fixed focal length lens focus by changing their focal length in addition to moving the lens's nodal point(s). To focus on an object close to the camera, the lens reduces its focal length. A lens ...
- 1,683
2
votes
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Does changing the focal length change the depth of field for the same magnification?
To get the same framing of your subject using the same camera, you'll have to shoot from further back with,say, an 85mm lens than with a 50mm lens. The decrease in DoF from using an 85mm lens compared ...
- 172k
2
votes
Accepted
MFD equals 4x focal length? But published specs contradict that
The site you reference does not state that the effect of focus breathing is small. It states (emphasis mine),
The nominal focal length applies for the lens focused at infinity, but may be shorter ...
- 31.6k
2
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MFD equals 4x focal length? But published specs contradict that
All of those formulae assume a single thin lens. Most actual lenses are compound lenses with multiple lens elements. When those elements are all moved in unison by the same amount to change the focus ...
- 172k
2
votes
Options to increase magnification when the minimum working distance is fixed
1) Would extension tubes be of any benefit here, since the camera/lens cannot be moved closer to the object? Stated in a general way, if the distance between the lens and object remains fixed and an ...
- 31.6k
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