Linked Questions

4
votes
3answers
365 views

Are points off-center from the lens axis out of focus? [duplicate]

If I take a picture of a flat surface perpendicular to the direction of the lens (i.e. the surface is facing directly at the camera), and I focus on the center, are the points off center in perfect ...
2
votes
2answers
249 views

Why “plane of focus”? [duplicate]

The spatial locus on which a lens/camera focuses (and so appears sharpest in the resulting image) is always referred to as the "plane of focus". My question is why does it have to be a plane? As I ...
0
votes
3answers
100 views

Focus of lens dropoff from center to ends [duplicate]

I have come across a couple lens manufacturers that mention that when a lens is focused such that the center of the FOV is well focused, the extreme ends of the FOV will be slightly defocused. What ...
17
votes
9answers
48k views

Should I use a 100mm Macro lens as a portrait lens?

I am specifically considering using the Canon 100mm Macro as a portrait lens. If I want to have a macro in my bag, but not carry around a 70-200 2.8 due to weight, size, white color, or price if it ...
14
votes
3answers
6k views

What is the reference point that the focal length of a lens is calculated from?

I understand the idea of a focal length for a single lens, i e the distance from the lens to the point at which parallel rays of light converge. However, in the case of a photographic lens with ...
3
votes
4answers
2k views

How can I focus on only part of the scene when there are multiple objects at the same distance?

I just wanted to have the red leaf focus only, and not have the nearby twigs in focus too. How can I achieve that? I locked the focus on the read leaf then move the camera to reposition the scene. ...
6
votes
6answers
4k views

Why is the Tamron 90mm 2.8 marketed as Macro and not as a “portrait” lens?

My question is if a lens like a Tamron 90mm 2.8 could be used also for portrait. If not, why ? What are the difference between a specific portrait lens (like any 85mm 1.4) and a 90mm 2.8 ? Only the ...
6
votes
2answers
2k views

What is the reference plane used when the minimum focus distance is measured?

Once you know the MFD (minimum focus distance) for a particular lens, is that the distance from the subject to the front of the lens or to the camera sensor?
9
votes
4answers
2k views

What is the advantage of a lens with a curved focal plane?

In this answer it is noted that: many lenses intended specifically for portraits or fisheye lenses, are designed to have a spherical field of focus What advantages does having a spherical (or ...
1
vote
6answers
2k views

How to ensure sharp focus when shooting with an open aperture?

I've bought a Canon EF 50mm f/1.8 to use with my EOS 200D and while I love the wide aperture, it appears to be quite difficult to achieve sharp focus on people's faces when shooting at f/1.8. I've ...
4
votes
2answers
2k views

Is AF-S DX Micro NIKKOR 85mm f/3.5G lens good for both macro and portrait photography?

I'm thinking of buying a macro lens am considering the Nikon AF-S DX Micro NIKKOR 85mm f/3.5G ED VR. Is this lens really good for portraits? Where can I find sample pictures taken with this lens? Is ...
4
votes
4answers
316 views

Does a macro lens have a smaller DOF in 'real-world' distances at the same focal length and aperture as other primes, why?

This question IS about: Does a macro lens have a shallower DOF at the same settings and focal length as another prime? If so, what in the optics is responsible for this? Using a Macro lens as a ...
3
votes
2answers
1k views

How does photography (as opposed to physics) define “focal-plane”?

This wikipedia article concerning focal-plane shutters opens with the following statement (bold emphasis added by myself): In camera design, a focal-plane shutter (FPS) is a type of photographic ...
1
vote
2answers
850 views

What are some tips for using a macro lens for non-macro photography?

I've seen this: Is a macro lens suitable for distant subjects - wildlife, sports, portraiture?, which says that macro lenses can be used for photography other than macro photography. But what are ...
1
vote
3answers
232 views

Does image quality of the lens affect “focus and recompose” technique?

As I understand it, 'focus and recompose' is often used to ensure the subject is in focus and at the same time composition is right. It has been estimated that some lenses are best in terms of image ...

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