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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.

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302 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) ...
10
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4answers
7k 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 ...
2
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3answers
170 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?
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1answer
59 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 ?
8
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3answers
5k views

Why prefer the 18-55mm and 55-250mm lenses vs 18-200mm?

There seems to be a preference for to have the 18 mm - 55 mm 55 mm - 250 mm lenses, but no mention of why they're better than a single 18-200mm. Could someone please explain why the two separate ...
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2answers
105 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. ...
8
votes
1answer
530 views

Why is the Canon MP-E 65mm F/2.8 Macro Lens not called a zoom?

The Canon MP-E 65mm works differently than my other macro lenses. Compare: With a standard 35mm macro, I can frame first and then adjust focus which only changes framing very slightly with. With the ...
29
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5answers
72k 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 ...
5
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4answers
258 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 ...
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1answer
53 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 ...
0
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1answer
69 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 ...
6
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3answers
4k views

What is the technical difference between focus and zooming?

This may look like a silly question but I don't know what the difference between zooming and focusing is. Zooming in will usually let me have fewer subjects in the scene while zooming out will allow ...
14
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4answers
2k views

Why push/pull zoom is not widespread?

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 released in 1988 use this type of zoom too, but the ...
2
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4answers
141 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 ...
17
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4answers
2k views

Fast prime vs. expensive zoom for indoor sports photograhy?

I plan to try shooting my kids' indoor activities (Tae Kwon Do and Figure Skating). I can get pretty close to the action for TKD, and I have access to ice/board level positions for shooting at the ...
0
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3answers
57 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.
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5answers
1k views

Why does the quality of my pictures lower the more I zoom in?

I have a Canon 60D with the 18-200mm kit Lens. I was at the beach not too long ago, I took some pics of my son in the sand, from a very close distance and they came out great. Picture quality was top ...
6
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4answers
895 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
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3answers
213 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 ...
24
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3answers
2k views

When you zoom in with a lens on an SLR why does the lens go in then out?

I guess this is more a question of optics than photography but I just got an SLR with a basic 18-55 lens. I noticed that when going from 18 to 55 or 55 to 18 the lens physically comes back in and ...
0
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0answers
140 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 ...
12
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2answers
4k views

What differences between point and shoot zoom versus DSLR zoom cause the price disparity?

I'm just getting into the world of photography, stepping up from a point-and-shoot. I've just purchased a Nikon D3100 and it should be here in a couple of days. I've done lots of research, but ...
2
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2answers
3k views

How close can a Nikon 1 J1 with 30-110mm lens “zoom in” to a shot?

I am trying to decide which camera to buy. Have looked into both the Nikon Coolpix P100 and 1 J1, and feel that the 1J1 is more adaptable, and has many features that I'd like to enjoy. But, I'm ...
11
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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, ...
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1answer
121 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 ...
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1answer
97 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
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4answers
153 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 ...
0
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1answer
462 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 ...
1
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3answers
245 views

How can I take a picture at 50mm with a Finepix s8200?

I have this camera. How do I take a picture at 50mm with zoom lens? Does this camera support zoom lens at 50mm?
6
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6answers
4k views

Would the Tamron 18- 270 mm F/3.5-6.3 Di II VC PZD make a good choice as my second lens?

I have a Canon 50/f1.8. I am looking for a zoom lens. After much research, I have zeroed in two lenses as my second lens: either Tamron 18-270 mm F/3.5-6.3 Di II VC PZD or Canon EF75-300mm f/4-5.6 III ...
5
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1answer
4k views

Why does my aperture setting change as I zoom on my DSLR kit lens?

I am new to the photography field, there are few things which I am not able to understand. I am playing around with my Nikon D90 along with its kit lens (18-105mm). While reading about Depth of ...
1
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2answers
340 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
7
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7answers
2k views

Which lenses are best for macro and for birdwatching (both Canon and Nikon)?

Now I have old Sony A100 DSLR + Minolta AF 24-50/4, Minolta AF 50/1.6, Tokina ATX 80-400/4.5-5.6, ... My camera is old. In near future I am going to buy new DSLR. I think it will be Canon or Nikon. I ...
11
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4answers
766 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
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2answers
88 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
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1answer
346 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
718 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
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2answers
256 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
678 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
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1answer
124 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 ...
0
votes
2answers
190 views

How is zoom measured? [duplicate]

Zoom meaning the ability to make something distant appear closer. Consumer cameras are sold with a maximum zoom which is supposed to define how much closer. For example a camera might be 40x zoom, ...
5
votes
2answers
90 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
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3answers
431 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
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0answers
93 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 ...
2
votes
1answer
194 views

Canon 16-35 f/2.8L II zoom ring noise

I just bought this lens. Out of the box, it makes a little noise while turning the zoom ring left and right (different from the other lenses I have, almost a metallic kind of noise). It looks like ...
7
votes
7answers
339 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 ...
11
votes
5answers
776 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 ...
8
votes
4answers
552 views

What is the technical name for a zoom lens which has a fixed maximum aperture?

What is the technical name for a lens which has the same maximum aperture throughout the entire zoom range?
37
votes
12answers
3k views

Is digital zoom really useful?

I've always wondered what is the use of digital zoom, apart from viewing the subject clearly on the LCD display. We can take a photo with the optical zoom and crop the photo to the desired region of ...
7
votes
6answers
305 views

Digital zoom versus optical zoom for minimising camera shake

Here's the scenario: every so often our garden plays host to some small deer. Naturally, I try to take pictures of them. From inside the house, I can get a decent shot with full zoom on my camera. ...