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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

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2answers
116 views

Can a lens be a zoom lens and a macro lens at the same time?

I am planning to buy an entry level SLR camera, mainly for use capturing macro and portrait photos. However, I'm a bit confused by this lens which is described as "Tamron AF 70 - 300 mm F/4-5.6 Di LD ...
8
votes
3answers
669 views

What is a pump zoom lens?

While browsing for cheap second hand lenses I found the Cosina 70-210mm f4.5-5.6. The seller notes that it's a pump zoom. Googling the term does yield some results, but these simply state that a ...
7
votes
4answers
1k views

Do I need other camera lenses if I have an 18-200mm or other super-zoom?

I wanted to ask that once you have purchased a lens of say 18-200mm, then is it required to purchase other lenses — say 24-70mm, 24-105mm, 18-105mm, 28-135mm,etc. Does 18-200mm lens satisfy all the ...
5
votes
6answers
391 views

What's the difference between zooming in on a subject vs moving closer? [duplicate]

If I stand 10 feet away from a subject and I want a close up shot, I can either zoom in or I can physically move the camera as close as possible to the subject. Which one is a better practice, or is ...
0
votes
2answers
151 views

Why does this lens lose focus when you zoom in but not when you zoom out?

This is regarding the Sony 18-105 E-mount constant-aperture zoom. I took at photo at 18mm, focusing manually: I then zoomed to 105mm, and took another photo, keeping the same focus: Notice that ...
0
votes
3answers
155 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 ...
4
votes
2answers
181 views

How do zoom, magnification, and focal length relate?

Zoom lenses and cameras with superzooms are often sold with a times ("×") zoom number — like a 12x zoom or 30x zoom. The question How do I convert lens focal length (mm) to x-times optical zoom? ...
2
votes
2answers
168 views

Difference between zoom and focal length? [duplicate]

Until now I thought that focal length is just another way of measuring how much a lens zooms: The higher the number the more it magnifies, the smaller the number the wider the angle and thus the less ...
2
votes
2answers
117 views

How effective are the rear weather sealing rings on lenses?

I am kinda torn between buying a Sigma 18-35mm f1.8, Nikkor 17-55 f2.8 and Sigma 17-50 f2.8 for my D3100 and D7100 cameras. The reason for confusion is that the Nikkor one has a weather sealing ring ...
0
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0answers
38 views

Shoot stars or planets with zoomlens.. How to compensate motion? [duplicate]

I know I have to use a wide angle lens for astrophotography, but lets assume i really want to focus on a small spot and capture very faint stars... I'd have 2 requirements that dont cope very well: ...
0
votes
0answers
19 views

How do I measure the distance between two object in a photo? [duplicate]

If I have a set distance from the camera to an object and a known zoom factor, can I calculate the distance between two objects in the photo by measuring the pixel distance? Thanks a lot! Ed
0
votes
1answer
167 views

Sony 3.5-5.6/18-55 SAM (SAL1855) lens broken

I have a Sony 3.5-5.6/18-55 SAM (part no. SAL1855) lens that has taken a knock and the zoom ring is now stuck fast at 55mm and the focus ring doesn't want to pull all the way in. Are there any guides ...
0
votes
4answers
107 views

What is the limiting factor of picture resolution?

What is the limiting factor? E.g (thought experiment) If we are 200m away from a tree (let's pretend it's perfectly stationary) and we take an exposure for a week, shouldn't we collect enough photons ...
-1
votes
1answer
91 views

Fixed lens camera [closed]

I hardly ever use the zoom on my camera, and am considering getting a fixed lens as my next camera. I want to ask does anyone know the release schedule of fixed lens camera's, are there any decent ...
0
votes
1answer
63 views

Why does the angle of view narrow as you zoom in? [duplicate]

Why does a 4mm lens have a wider angle of view than an 8mm lens ?
1
vote
2answers
122 views

How to focus manually with a Nikkor AF-S DX VR 50-200mm f/4-5.6G zoom lens?

I have a Nikon D3100, for which I just bought a Nikkor AF-S DX VR 50-200mm f/4-5.6G zoom lens. This is a CPU lens and works very nicely in auto-mode, i.e. when you let the camera set the focus. ...
3
votes
3answers
245 views

Variable focal length for macro lenses?

True macro lenses come in fixed focal length. Are there any macro lensens which have variable focal lengths? And please explain why yes or why not?
0
votes
1answer
65 views

Why is the external lens for my smartphone blurry when not at full zoom?

I've just bought an optical zoom lens for my Samsung S4 (I'm a web developer and blogger so I thought that it would be a handy tool for taking photo's when out and about without my main camera). The ...
-1
votes
1answer
109 views

Does manual focus carry over to a different aperture, lens or focal length?

This is in the manual focus mode. If I focus my lens so that a certain object is clear and crisp, and then do one of the following, will I have to focus again? Change the aperture Switch to a ...
5
votes
4answers
292 views

Photo : inverse of miniature effect

I am very interested in the miniature effect widely used in photography. Which is to make large scenes such as if they were toys. I wonder if the opposite effect was, of giving a tiny object the ...
1
vote
3answers
632 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) ...
2
votes
4answers
147 views

What justifies the double price of zoom lenses?

When I read the pros and cons of these two type of lenses, the lists looks like this: Pros of prime: Sharper images Lightweight Cheaper Bigger aperture (shallow dof, better in low light) Even ...
0
votes
3answers
77 views

zoom in vs cropping?

I take a photo by zooming in (optical) and cropping a photo without zoom. What would be the difference among the two? I know cropping reduces the photo quality but that's a minor issue for me.
6
votes
4answers
1k 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 ...
2
votes
3answers
299 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 ...
0
votes
0answers
187 views

How is it possible for bridge camera with 50x zoom to cost so little? [duplicate]

i state that i'm a completely beginner in the wonderful world of photography. Last year i bought a Fujifilm FinePix S2980 ...
0
votes
1answer
234 views

What's the practical difference in an image taken at focal length of 200mm vs 300mm? [duplicate]

I'm confused about the 200mm and the 300mm zoom ranges. I am looking for some examples of the same subject, in order to visualize the difference between 200mm and 300mm focal lengths. I want to ...
11
votes
2answers
1k views

Does a greater optical zoom range on a lens mean less image quality?

I have read that big optical zooms of let's say 10X do not produce excellent image quality. Is this true even nowadays, as there have been many technological improvements in this area? For example, ...
1
vote
1answer
103 views

Can a lightweight telephoto zoom lens fulfill my expectations of excellent image quality? [closed]

I am interested in purchasing a Canon, light, in terms of weight, telephoto zoom lens. I would like excellent image quality though. Are my expectations far from real? My future lens is purposed for a ...
0
votes
4answers
290 views

Looking for a telephoto zoom lens - Tamron, Canon or Sigma?

Are Tamron and Sigma trustworthy as compared to Canon? I am a beginner, so please help me. I have my kit lens Canon 18-55 mm. However I am looking for a telephoto zoom lens. For this reason a Canon ...
1
vote
1answer
1k 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 ...
11
votes
4answers
795 views

Other than speed and weight, what advantages might a prime lens have over a zoom at the same focal length?

At the same focal length, apart from speed and maybe weight, what other advantages does a prime lens like the 50mm have over a zoom lens like the 24 - 70mm? To put it better, If I set my 24-70mm lens ...
0
votes
2answers
107 views

Is a Sigma AF 28-80 an useful addition to a Nikkor 35-105 macro?

I'm experimenting with photography and I'm on a budget: I'm using a Nikon D70 and I already have a Nikkor AF 35-105 f/3.5-4.5 macro and a 50 mm f/1.8 E (manual focus). Now I found a cheap Sigma AF ...
1
vote
1answer
657 views

Effective zoom of Sony 55-210 lens (e-mount for NEX series camera) [duplicate]

According to Sony's website this lens has a zoom factor of 3.8. I currently have an 18-55 lens that came with my NEX-3F that has a zoom factor of ~3.1. Since the 55-210 pics up where the 18-55 leaves ...
3
votes
4answers
1k views

How do I choose a zoom lens for Canon APS-C?

I know nothing about any of this. From my research, Canon's 70D looks like a good camera body for a retired (31 years) professional photographer (my dad) to "pick the camera back up" in the digital ...
1
vote
2answers
283 views

Why don't DSLR camera specifications include a zoom ratio (e.g. 3x zoom) like compact cameras?

For example, there is no mention of the zoom here. I'm guessing that it's specified in some other specification. If so, what do I look at and how do I compute the zoom from it? I've looked at a few ...
2
votes
1answer
788 views

Why is the Tamron 150-600mm lens so cheap? [closed]

The newly released Tamron 150-600mm f/5-6.3 SP Di VC USD seems to have garnered very positive reviews at a killer price ($1069). Tamron seems to have not compromised on optics (comparable image ...
1
vote
1answer
164 views

Am I correct that photos from the 16-50 lens won't be much better than cropping photos from the 35mm prime?

I own a Sony NEX-5R, with the Sony 35mm F1.8 prime and the Sigma 19mm F2.8 prime. I'm deciding whether to buy the Sony 16-50 power zoom. To make that decision, I need to decide whether cropping the ...
5
votes
2answers
106 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 ...
2
votes
3answers
774 views

Why is zoom avoided in large sensor compacts?

Why don't large sensor compacts (for low light shooting in moderate distances) with, let's say, 10x zoom exist? I'm primarily thinking about models such as Sony RX100 or Canon G1X that come in a ...
0
votes
0answers
99 views

Is it convenient to build a collection of prime lenses and forgo a zoom entirely? [duplicate]

I use a Sony NEX-5R, with a couple of prime lenses (19mm F2.8 Sigma and 28mm F1.8 Sony). I am trying to decide whether I should buy a longer prime lens, like the 60mm Sigma, or buy a zoom lens ...
9
votes
7answers
424 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 ...
2
votes
1answer
735 views

What is equivalent focal lenght to Canon Sx50s at 50x zoom for a dslr lens?

I'm new at photography, and have a sony slt a37 camera. I was looking for telephoto lenses and got a Minolta 75-300mm f/4.5-5.6. Then I wondered what focal lenght the Canon sx50 has on its lens. I saw ...
1
vote
3answers
2k 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 ...
4
votes
3answers
583 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 ...
0
votes
2answers
949 views

How does focal length relate to macro magnification? [duplicate]

I'm new to photography and would like to know a little more about zoom lens, The main thing I wonder about is this, I have a Fujifilm S4000 camera that claims to have 30x magnification. The new ...
1
vote
2answers
1k views

Canon Sharp Zoom Lens for Fashion Photography

I am looking to buy a Canon L lens, preferably a zoom to cover various ranges and focal points. I had a look on the new Canon 24-70f4L and it looks fantastically sharp. However, someone mentioned on ...
1
vote
2answers
540 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
11
votes
5answers
795 views

Why are 50mm no longer the default kit lens for prosumer SLRs?

Every time someone asks me for a kit recommendation I point them towards some sort of prime lens with a standard focal length. Similarly, almost anyone I talk to about the ideal budget kit swears that ...
5
votes
3answers
2k views

Best lens for taking pictures of surfers

I'm just trying to decide which new lens to get. I need to take surf and windsurf photos from onshore. Sometimes 300 mm is enough but there are many times they are too far away. I have a sigma 70-300 ...