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An optical 'zoom' or 'variable focal length' lens is one that has a range of focal lengths at which it can operate. "Digital zoom" is a technology which simulates optical zoom by cropping the image.

learn more… | top users | synonyms

2
votes
1answer
128 views

Does a lens exist that is parfocal, has a linear zoom throw, and is affordable?

I'm working on a project to create, essentially, a servo-powered zoom lens, using a (D)SLR zoom, a zoom ring gear, and a stepper motor. After mounting the zoom ring gear, I'll attach a pinion gear to ...
2
votes
1answer
617 views

What can cause massive overexposure on a Canon IXUS when zooming in?

I have been using Canon IXUS 130 for some years and it has been giving decent good photos and videos. Strangely, few days ago, whenever I use the telephoto zoom and take a picture, the picture is ...
12
votes
3answers
1k views

How do zoom lenses restrict their widest aperture at the telephoto end?

Does the aperture ring lock the apertures beyond, say 5.6 at length lens's telephoto end? Does the lens introduce an obstacle to the aperture ring so the lens can't be opened anymore beyond the ...
34
votes
5answers
7k views

How do constant aperture zoom lenses work?

Cheaper zoom lenses usually are faster at the wide end and slower at the long end (for example, the $150 Canon EF-S 18-55mm f/3.5-5.6). More expensive constant-aperture zoom lenses have the same ...
5
votes
6answers
4k views

Between Nikon 18-55mm II and 50mm f/1.8, which suits my needs better?

I am an absolute beginner in serious photography. I'm a position to get a Nikon D70 body for $100 or so. I've been researching lenses and I'm debating if I should get the one that originally came ...
3
votes
2answers
136 views

Blurry without zoom, sharp with zoom

I have Nikon Coolpix S5100. I've noticed that my photos are blurry when I'm NOT using zoom, while they are pretty sharp WITH zoom. It doesn't matter whether I shoot from the hand or from the solid ...
6
votes
4answers
3k views

Why is my lens only somewhat sharp near the center and very blurry on the edges?

I bought a canon 50-250mm IS lens (for my T1i), maybe two years ago and haven't used it much, but whenever I do, I always regret using it. Pictures are blurry, the depth of field too shallow and so ...
4
votes
4answers
638 views

Why do two zoom lenses set to 200mm on the same camera produce different fields of view?

I've been testing out a Nikon 18-200mm F3.5-5.6 against a Nikon 55-300mm F4.5-5.6 I took two pictures of a door knob from an equal distance of about 3 meters away with the same Nikon d7100 DX camera ...
12
votes
10answers
3k views

Do photographers avoid using zoom?

Because most lenses do no have a fixed aperture, do most photographers avoid using zoom as to avoid messing up their settings and their established exposure?
1
vote
5answers
3k views

Why image at 400mm is LARGER THAN DOUBLE of image at 200mm? (according to lens formula)

Like most of us, I thought it was yes. Until I really look into the Lens Equation: (1/subject distance) + (1/image distance) = (1/focal length) ...
3
votes
4answers
839 views

Should a Nikon 18-55 lens zoom automatically?

I have purchased a Nikon D5000 camera with 18-55 from eBay. The lens focuses automatically, but should the lens also zoom automatically or is this controlled manually by the zoom ring.
14
votes
7answers
41k views

What is the difference between a telephoto lens and a zoom lens?

Looking at the product page for Nikon lenses, I notice a distinction between telephoto lens and zoom lens. What is the difference between the two? Why would I want one over the other? I wiki'd ...
15
votes
4answers
23k views

What's the advantage of buying a fixed 50mm f/1.8 lens when my camera has an 18-55mm zoom lens?

I've got a Nikon D3100 with an 18-55mm zoom lens. I'm keen to experiment with some other lenses and a friend of mine recently reccommended I purchase a fixed 50mm f/1.8 lens as he said it's good for ...
2
votes
1answer
72 views

Possible to lock focal length on zoom lens? (SELP1650)

(This could turn out to be a bone, practical, product-specific query, but this is the internet so the worst that could happen is a 0 rather than a 1.) Anyhoo: is it possible to lock a zoomable lens ...
1
vote
4answers
6k views

24-105 f4 vs 24-70 f2.8

I am looking for a secondary zoom lens for my Fashion Shoots. I'll be using the 50mm 1.4 as my primary go-to lens and the zoom for everything else. I was wondering which of those lenses perform better ...
11
votes
2answers
9k views

What is the meaning of W and T on a camera's zoom buttons?

On every conventional digital camera (excluding the models with detachable lenses), there are buttons to zoom in and out with W side and T side. When you press W, the lens zooms out. The lens zooms ...
9
votes
7answers
672 views

Should I postpone buying a zoom lens until I've learned to zoom with my feet?

After several years of shooting with my point-and-shoot, I upgraded to an NEX-5R, with two prime lenses — a 35mm f/1.8 and a 19mm f/2.8. I don't have a zoom lens, not even the kit lens. I've been ...
0
votes
0answers
39 views

camera and lens for bird photos [duplicate]

I like to go birding. Instead of using binoculars solely and trying to remember the markings to later ID the bird, I would like a camera and lens which would allow me to take crisp photos from quite a ...
0
votes
1answer
196 views

How do the Sigma 35mm and 50mm Art primes compare to the Tamron 24-70 f/2.8? [closed]

I shoot people portraits, couple engagement sessions and children (specially my own 1.5 years old). Locations are 70% outdoor green parks or urban settings, 25% indoor in my home and just 5% scenic ...
0
votes
1answer
144 views

How does a Panasonic Lumix FZ1000 compare with a Canon EOS 1000D? [duplicate]

I have the chance to get a Panasonic Lumix FZ1000 (as a gift from my employer, of my choice), how does this compare with the camera I have, a Canon EOS 1000D ? My Canon works perfectly well, but is ...
2
votes
2answers
235 views

Panasonic Lumix FZ1000 - How does it compare to binocular magnification?

I know almost nothing about photography. But I am interested in learning. My dad just purchased a Panasonic Lumix FZ1000. I own a pair of Leica 10x50 binoculars. I asked him how the maximum zoom or ...
14
votes
5answers
4k views

Why are push/pull zooms relatively rare?

The Canon EF 100-400mm f/4.5-5.6 L IS USM has a push/pull zoom mechanism instead of a zoom ring. Other lenses, like the Nikon 80-200mm f/2.8 AF that was released in 1988, use this type of zoom too, ...
2
votes
3answers
193 views

Is the Canon 70-200mm or 24-70mm better for convention photos? [closed]

I've decided I want to upgrade to a better lens, but I'm really torn between the Canon EF 70-200mm f/2.8L IS II USM and the EF 24-70mm f/2.8L II USM. I like to take convention photos, where space is ...
1
vote
1answer
69 views

What Nikon lenses are recommended for everyday photos and some macro? [closed]

I'm about to buy a Nikon D5300, and I want to buy 2 objectives. My interest are primarily social photo and some macro, not really interested on telephoto at all. The budget is kind of limited. Right ...
1
vote
1answer
6k views

Nikon 55-300 VR lens vs other Nikon zoom lens

I've Nikon D5100 with 18-55mm kit lens. Had the 55-200mm VR lens but sold it last year. I really enjoyed using the 55-200mm and had no complain. Now I am planning to buy another zoom lens and have ...
4
votes
3answers
1k views

Are prime lenses sharper than normal or telephoto zoom lenses?

Example: The prime lens Nikon 1.4F G is said to be very sharp at F3.5. So, if I compare that with the normal or telephoto zoom lens's F3.5, will the level of sharpness be same? If no, then will the ...
3
votes
1answer
358 views

What is the shot called where it goes from telephoto to wide-angle without a zoom? [closed]

I've seen this effect in movies where where the background behind the subject expands. In the movie "Ever After" when the father dies, they do that effect with the the daughter. It thought I saw a ...
1
vote
5answers
3k views

What are the pros and cons of constant-aperture zoom lenses, for a relative beginner?

I use a Sony NEX-5R, and I bought the Sony 18-105 F4 constant-aperture lens. I'm aware that the constant-aperture F4 gathers more light than, say a F3.5 - 5.6, and it gives you more control over the ...
1
vote
3answers
3k views

Why don't the zoom buttons work on my DSLR?

I am a newbie to the new camera I just bought. It is a Nikon D5200 it has the original lens that came on the camera a 18-55 lens on it. My question is when I turn the lens to the 55 and then push the ...
2
votes
2answers
103 views

Difference between using camera's macro mode vs zooming in with a telephoto lens [duplicate]

I'm photography enthusiast, But I'm unaware of the difference between my camera's macro mode vs zooming in with a telephoto zoom lens What difference does it make when I zoom in with a telephoto lens ...
0
votes
2answers
87 views

Can anyone help me identify this lens? Pk 80-200mm autozoom

I have a lens I was going to try to sell on ebay but can't figure out what it is. Doesn't appear to have a manufacturer name. Made in Korea, side has 22 16 11 8 5.6 4.6 PK. Top has 80-200mm cct ...
0
votes
4answers
429 views

What are the differences between the Nikon 55-300mm and Nikon 18-105mm lenses?

I bought a Nikon D5200 and I'm willing to go out of the kit lens. So I stumbled upon two lens that I can afford, but I don't know which one to pick because I'm still a beginner. Can you please tell me ...
4
votes
1answer
230 views

What are the advantages and disadvantages of zoom lenses with a wide range of focal lengths? [duplicate]

Are there some disadvantages of a zoom-lens with wide range focal length compare to a lens with narrow range both having the same max. aperture? For example, if we have two lenses: Sigma 18-55mm f4 ...
1
vote
2answers
1k views

How to fix Canon 17-40mm F4L loose zoom ring?

I bought a used Canon 17-40mm F4L a while ago, and I just noticed it had the Zoom Ring kind of loose and also a lot of my pictures that were taken at the widest were 19mm instead of 17mm
41
votes
7answers
172k views

How do I convert lens focal length (mm) to x-times optical zoom?

What is the rule to convert the 'mm' notation to the 'optical zoom' notation? I searched a bit and found this one: optical zoom = maximum focal length / minimum focal length For example a 18-55mm ...
0
votes
1answer
36 views

Can I mod binoculars to connect a T2 adapter (for EOS)?

I'm afraid of breaking my binoculars if I remove the eyepiece. I'm looking for a cheap way to get some zoom for a lower price than a celestial telescope.
0
votes
0answers
46 views

How can I use sigma zoom 100-300mm on my new Nikon D5100? [duplicate]

Is it possible to use a Sigma zoom 100-300mm lens on my new Nikon D5100? I tried fitting it but couldn't. Can you suggest an adaptor or something that I can fit into to use this lens on my Nikon ...
1
vote
5answers
207 views

Are prime lenses sharp across the whole frame while zoom lenses are soft in the corners?

Somebody told me that there is a difference in sharpness between a zoom lens vs. prime lens. A 58-200mm will give sharp focus in the center of the frame but blurry performance at the corners, while ...
0
votes
5answers
336 views

How to work out the base “zoom magnification” of a lens? [duplicate]

I've come from 3x Zoom magnification land and am having a hard time adapting to all these complex "mm" systems. I'm thinking about buying some lenses to enhance the range of zoom of my Sony A5000 ...
0
votes
1answer
94 views

Upgrading to a better quality camera before a wildlife-focused vacation [duplicate]

I'm sure this has been asked many times before, but anything would be helpful. I'm looking to upgrade from a standard point-and-shoot to a higher quality camera before a safari vacation. I was ...
1
vote
1answer
116 views

Why don't all zoom lenses have variable f-numbers? [duplicate]

As I understand it, the f-number is a ratio between the focal length and the aperture diameter. A zoom lens can change focal length, but shouldn't the maximum aperture be a fixed size? If so, that ...
5
votes
2answers
209 views

Can extension tubes be used to zoom in in pinhole / zone plate photography?

In a recent question it was stated that You cannot change the focal length of the zone, it is fixed and a characteristic of the physical dimensions of the camera As far as I know, focal length ...
0
votes
1answer
89 views

Comparing focal length [duplicate]

Hello I want to move from my compact camera to a dslr. I am fan of landscape photos so I want to buy an ultra-zoom lens. My camera supports 14x optical zoom. I know that for compact cameras it's just ...
2
votes
4answers
909 views

Why is my Canon 55-250 IS lens blurry at focal ranges beyond 100mm?

I recently purchased a used Canon 55-250mm IS lens and it works nicely at 55mm(even with lower shutter speed, and f/4 aperture), but turns out quite blurry at longer focal lengths, even with a shutter ...
1
vote
1answer
103 views

Why doesn't the zoom ring on my Vivitar 75-205mm lens turn?

I bought a Vivitar 75-205mm zoom macro lens for Minolta MD yesterday without paying much attention to the seller's details: I bought it as a gift to someone important for me. She only has a 35mm ...
3
votes
1answer
504 views

What difference is there between the 50mm in a zoom lens, a 50mm prime lens, and a 50mm macro?

I would like to know the differences between: 50mm prime lens 50mm in a zoom lens 50mm macro lens
2
votes
3answers
152 views

If the zoom number doesn't tell me magnification, what does? [duplicate]

I've read How do I convert lens focal length (mm) to x-times optical zoom?, and learned that the times-zoom number doesn't tell you much. So, how do you determine the magnification — the amount a lens ...
2
votes
2answers
86 views

Are compact cameras with a zoom lens safe from dust?

The only relevant "dust" references in my holiday camera manual are: Do not store or use the camera in locations that are: ... very humid or extremely dusty and Build up of dust in your ...
9
votes
4answers
2k views

Is it safe to zoom while taking a photo for the effect?

I have clicked some photos by using the trick of zooming in and zooming out with the lens while the shutter is open. All the photos came pretty cool and crazy. I am very happy with the effect, but I ...
4
votes
4answers
1k views

What are the disadvantages of super-zoom cameras compared to binoculars?

Maybe it is clear from my question that I don't know much about lenses, both on binoculars and super-zoom cameras, for example I don't know how can I compare the light that enters a binocular with a ...