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.
Michael C's user avatar
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42 votes
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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 ...
NoahL's user avatar
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12 votes
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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 ...
Alan Marcus's user avatar
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12 votes

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 ...
scottbb's user avatar
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9 votes

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 ...
PhotoScientist's user avatar
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 ...
Michael C's user avatar
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5 votes

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 ...
Mike Sowsun's user avatar
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5 votes
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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 ...
Michael C's user avatar
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4 votes

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 ...
WayneF's user avatar
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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 ...
inkista's user avatar
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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 ...
WayneF's user avatar
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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. ...
Steven Kersting's user avatar
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 ...
Itai's user avatar
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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 the ...
calocedrus's user avatar
3 votes

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 ...
Mike Sowsun's user avatar
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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 ...
scottbb's user avatar
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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 ...
Tvrtko Zadro's user avatar
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 ...
Alan Marcus's user avatar
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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 ...
Michael C's user avatar
  • 175k
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. ...
Edgar Bonet's user avatar
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2 votes

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 ...
Matthieu Moy's user avatar
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2 votes
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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 ...
scottbb's user avatar
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2 votes

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 ...
Michael C's user avatar
  • 175k
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 ...
scottbb's user avatar
  • 32.7k
2 votes

Magnification percentage meaning

There's no direct constant relationship between the two things.¹ This is because different cameras have different pixel densities as well as different sensor sizes. It's also because different display ...
Michael C's user avatar
  • 175k
2 votes
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Would an MFT to EF speedbooster on an MFT camera help me photograph and record backyard wildlife?

A speed booster increases aperture at the expense of magnification. “Speed” comes at the expense of magnification. Wider aperture for shorter focal length. 0.64 times the given focal length in this ...
Bob Macaroni McStevens's user avatar
2 votes

Clarifications about the Reproduction Ratio Formula

Your expression is only valid when the object is far enough away that one can regard the distance from lens to image as the focal length. When you get closer the distance from lens to image increases....
Ross Millikan's user avatar
2 votes

Home made lens system for imaging 3mm wide object

I checked your math using a different approach. More years ago, than I care to remember, I needed to calculate the focal length needed to yield a specific magnification with a specific Object to Image ...
Alan Marcus's user avatar
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2 votes

Home made lens system for imaging 3mm wide object

Assuming there is no fixed lens in your camera, then your calculations are correct. Perhaps a bit "too" correct, in the sense that the thin-lens formula assumes a negligibly-thin lens. Your ...
scottbb's user avatar
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