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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

1
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1answer
526 views

How to fix a zoom lens that is sticky at a particular focal length?

I have the Canon 18-55mm lens. When I zoom out from 55mm to 18mm, the lens works fine until 22mm, where it seems to be stuck and you must then use a bit more force. I saw in many sites that this is ...
6
votes
5answers
3k views

Why is my Nikon 18-200 lens not focusing at higher focal lengths?

My Nikon 18-200 lens on a D300 camera will not focus when it is zoomed between 135mm and 200mm. Is there any tips on how to solve this besides handing it in to a photo store?
6
votes
1answer
430 views

When focusing at max zoom, focus is lost after zooming out. Is that normal?

On my Canon kit lens, I could completely zoom in, focus on the object and then zoom out to take the picture with the object still in focus. Now I have a Sigma 18-200mm (with a Canon 600D) and that ...
5
votes
1answer
778 views

Do all telephoto zoom lenses backfocus on the wide angle end?

I’ve just gone through a round of testing with two telephoto zooms, on two different cameras, and both appear to have significant back focus issues at the 70mm end. I just had the Nikon 70-200 f/2.8 ...
0
votes
2answers
820 views

How does the Tamron AF 28-75mm f2.8 compare to Canon EF-S 15-85mm f/3.5-5.6 IS USM?

I am looking to buy a good walk around lens for t3i to finally upgrade from my kit lens. My current preference is Canon 15-85. however I am wondering if I should get Tamron AF 28-75mm f2.8. I am ...
2
votes
2answers
2k views

What is the best Canon Telephoto Zoom Lens for $600-650?

I intend to expand my lens arsenal for my Canon 650D. Already have the kit lens 18-55mm and the UWA Tokina 11-16mm 2.8. My next objective is to get a telephoto zoom lens in the range $600-650. ...
4
votes
3answers
474 views

Are modern telephoto zooms so improved that they're not a big tradeoff vs primes? [duplicate]

I am looking for a good amateur telephoto lens for Nikon DSLR. It's main purpose will be sport shots. Back when I learned photography with film SLR, a fixed focal lens was significantly better than a ...
9
votes
4answers
494 views

Why are some zoom lenses “soft” at either end of the focal length range?

As one reads about zoom lenses, a relatively common comment that comes up in reviews of some lenses (especially lower-priced lenses) is that the lens is not as sharp ("soft") at one or both ends of ...
4
votes
1answer
193 views

Is it normal for the zoom to be loose on a Sony 18-250 lens?

I have the Sony 18-250mm lens. The lens is so loose that it doesn't keep a focal length, but slides down to the fullest extension with minimal downward slope. Is this standard or should I see a ...
5
votes
3answers
570 views

What differentiates a Canon standard zoom from an ultra-wide angle zoom?

I was checking the Canon website and found that the EF-S 15-85mm f/3.5-5.6 IS USM lens is a "standard" zoom lens, whereas the EF 17-40mm f/4L USM is described as an "ultra-wide" Zoom. Is there ...
3
votes
1answer
300 views

Can anyone show me an example of Zoom Creep on Nikkor lenses?

Looking for some pictures which certainly demonstrating this problem on Nikkor lenses. I am about to purchase the lens and want to be able to distinguish.
5
votes
2answers
1k views

Can't auto-focus at full zoom

I have a Canon 1000d, and the standard lens EF-S 18-55mm. Recently I was out taking photos and I've noticed that if I zoom in fully, the lens can't auto focus. I can still take shots using manual ...
0
votes
4answers
4k views

Nikon DSLR and optical Zooming [duplicate]

I want to buy a professional camera like Nikon D300. I googled a lot but did not overcome the following dubs. 1) I want a high optical zooming camera. In DSRL specification no zooming is specified. ...
-1
votes
2answers
267 views

slr 100mm to 300mm vs 10x 20x [duplicate]

SLR zoom capacity is described in term of mm instead of x like 4x, 8x etc. What is the difference? How can we convert mm into x.
2
votes
2answers
391 views

Why is depth of field minimised at the max focal length of a zoom lens?

I am using Nikon D7000 with 18-105. I have read people saying to get images with the minimum depth of field, the lens should be at its maximumum focal length, in this case at 105mm. However at 105mm ...
3
votes
2answers
414 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.
3
votes
4answers
2k views

Canon 24-105 vs 70-200 within the same range

I'm interested about shooting within the ~70-100mm range. I found out on google shop that these two lenses are priced $750[24-105mm, new] and $550 [70-200mm, new], respectively. Which one do you ...
2
votes
2answers
200 views

What is zoom multiplication based on?

When a camera says that it has, for example, a 10x optical zoom, what exactly is that 10x based on? Is it the angle of view of the human eye, the focal length of the camera, or what?
1
vote
3answers
407 views

How to get focal length from a camera specification which gives a value like “4.5-22.5”?

I am using a Sony W520 camera. The specifications mention Focal Length (f= mm) 4.5-22.5. What number should I take? The lower value or the higher? And if not both of them, then how to calculate actual ...
9
votes
2answers
4k 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 ...
2
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1answer
243 views

Is the zoom (18-55mm) of my Nikon D3000 broken?

I've been having troubles with the zoom of the camera. I can only set the level from 18 to 24 when I used to be able to choose what ever value I wanted (between 18 and 55mm of course!!). The 'zoom ...
6
votes
1answer
279 views

How many moving elements in a Canon A490?

I got mugged a few days ago, but got my camera back in the end. Bonus: I got some sand too. I now have the camera in pieces, cleaning them as I go along, and the lens barrel extends and retracts ...
4
votes
2answers
883 views

Why does calculated distance of an object in an image vary when zooming?

I would like to calculate the distance of an object from my camera, so i used the formula given in this question and I got a very good answer, but I've found that when I zoom and take the picture and ...
2
votes
1answer
284 views

Is it normal for the Fujifilm HS25 to have high resistance to zoom?

I bought the 35mm "dslr emulator" on a trial basis. Attracted to hand-zoom lens as motorized zoom is the "weak link" (in terms of camera mean time between failure) on motorized non-dslrs (where entire ...
1
vote
1answer
130 views

Macro mode: Should I make sure the lens is all zoomed out?

It appears that on most compact digital cameras, the macro mode (flower symbol) works best (or only) when the zoom lens is at the widest setting (comparable to e.g. 35 mm). What is the reason? ...
3
votes
2answers
4k views

What is the conversion between focal length and times zoom? [duplicate]

Possible Duplicate: How do I convert lens mm to optical zoom times? What is the conversion between focal length in mm (e.g. 50mm) and x zoom (e.g. 20x) commonly used in compact cameras? Is ...
5
votes
1answer
2k views

Should my flash zoom match my lens focal length or its 35mm equivalent?

I have a camera with an APS-C sized sensor. Should my flash zoom match my lens's actual focal length or its 35mm equivalent? I am hoping that someone can shed some scientific light to this matter.
10
votes
5answers
1k views

What are the pros and cons of non-extending zoom lenses?

Apart from the obvious benefit of not changing the center of gravity, what are the technical pros and cons of zoom lenses that do not change "physical length" when changing the focal length? For ...
4
votes
1answer
877 views

24mm f2.8 vs 24-85 f3.5-f4.5 (Nikon)

I have a 17-50 f2.8 zoom (Tamron) and while it performs admirably, it is heavy. So I was thinking of a 24mm f2.8 prime, when I also read up on the 24-85 f3.5-4.5 (non-VR) AFS lens. Here's the ...
3
votes
1answer
334 views

What do I need in order to mount my zoom lens onto a tripod?

I just purchased a cheap Opteka zoom lens and it is super long -- over two feet when fully elongated. It has built-in a tripod mount and I have no idea how to use it. I currently own a Vanguard ...
1
vote
1answer
545 views

What is cheapest way to get a 10-20× zoom range on a Nikon D5100? [duplicate]

Possible Duplicate: How do I decide on a camera/lens with high zoom range? There are a lot of relatively cheap ~ 300$ (with body) consumer cameras with mega-zoom features — i.e. lenses with ...
10
votes
2answers
433 views

Max aperture on zoom lenses - stepwise or linear?

When zooming with lenses without a fixed max aperture, the change in aperture* that the camera displays is stepwise, usually in steps of thirds. But, is the max aperture really the same all the way as ...
20
votes
4answers
3k views

What is focal length and how does it affect my photos?

What is focal-length? Are focal-length and zoom synonymous? How does the focal length of a photo affect it?
2
votes
2answers
3k views

What are the differences between the Canon EF 70-200mm f/2.8L IS II USM lens and the one that isn't IS II?

On Amazon, the Canon EF 70-200mm f/2.8L IS II USM Telephoto Zoom Lens for Canon SLR Cameras is $2500 whereas the Canon EF 70-200mm f/2.8L USM Telephoto Zoom Lens for Canon SLR Cameras is a mere $1400. ...
5
votes
5answers
4k views

Canon EF-S 15-85mm IS USM or Canon EF-S 18-135mm IS to replace a broken kit lens?

I'm looking to upgrade the 18-55 kit lens I got with my 450D. I finally settled choosing between these two. Which one would you get and why? I do mostly amateur photography on my spare time, trips ...
3
votes
4answers
3k views

Why am I getting soft images with my Sigma 24-70 f2.8?

I recently purchased a Sigma 24-70mm f2.8 lens which I am using on a Canon 40D body. Around 8 of 10 shots were soft, regardless of subject matter. Exposure, white balance etc. all looks fine. I only ...
7
votes
4answers
1k views

How to take sharp photos while using maximum optical zoom?

When I shoot with high zoom (above 3X on my point-and-shoot camera), the sharpness of the picture seems to come down. Is it a feature of all cameras or is it due to higher sensitivity to camera shakes ...
1
vote
2answers
344 views

Does image quality on compact cameras degrade when zooming in?

I have a Panasonic Lumix LX5 which I find generally produces good photos. However I have noticed on numerous occasions that the image quality when at the limit of the optical zoom (not using the ...
0
votes
1answer
306 views

How does the Tamron 55-200mm LD macro lens compare to the Canon 55-250mm IS?

I have a Canon 1100d, the standard 18-55mm lens kit, and the 50mm f1.8 lens. I want to buy a zoom lens as I would like to be able to get closer to far away subjects. I have been looking at both the ...
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 ...
7
votes
5answers
2k views

How much different are the Tamron 17-50mm f/2.8 stabilized (VC) and non-stabilized versions?

I have seen these 2 lenses being suggested by many people across the site as general purpose zooms and an upgrade to the typical 18-55mm kit lenses. The price difference seems to be around $200 (~INR ...
2
votes
1answer
527 views

How much difference is there between the Pentax DA 55-300 and FA 80-320?

I currently have a Pentax FA 80-320, and it's very nice to have a long zoom available. Lately, I've been considering "updating" to the DA 55-300. I also have the DA 50-200, so the lower end of the ...
3
votes
3answers
1k views

How important is optical zoom in snapshot cameras?

I want to buy a new snapshot camera. Because i want a new one with geo-tagging, I haven't such a great choice. So the following three cameras are my favorites: ...
1
vote
2answers
368 views

Is the used Nikon Nikkor 18-200mm lens I bought broken?

I bought the 18-200mm Nikon lens used through a reputable vendor through the mail. I purchased insurance just in case the lens did not work or was damaged in shipping. I'm not a professional but I ...
3
votes
2answers
2k views

Will a prime lens help me get better portraits at a wedding?

I have a Canon 600D with the EF-S 18-55mm f/3.5-5.6 IS lens. I have a friend's wedding coming soon, and I'm not sure if my zoom lens will do a good job or not. I was thinking of buying a prime lens so ...
15
votes
2answers
2k views

Why do zoom lenses and compact cameras have varied maximum aperture across the zoom range?

Why does a camera's maximum (allowed) aperture get smaller when you increase its zoom?
4
votes
4answers
3k views

Best all-around ~$600 standard zoom lens for Canon? [closed]

I have a Rebel T2i, I was wondering what standard zoom lens is the best around $600. I'm mainly shooting landscapes / cities / peoples. I've done some research and came up with 17-50, 18-55 from ...
1
vote
3answers
271 views

What are particular potential problems to watch for when using a telephoto zoom?

I recently got the Canon EF-S 55-250mm IS II lens as a complement to my 18-55mm kit lens for my 550D. I was looking for some advice\best practices for using a telephoto zoom, any associated ...
8
votes
3answers
467 views

Would a fixed or zoom telephoto lens be better for learning?

My daughter has a Nikon D-90 camera body and two prime f1.4 lenses 50mm and 35mm. She is interested in learning more, and I am curious which of a zoom or fixed telephoto lens would help her best? Is ...
12
votes
4answers
4k views

How can a lens like a 18-55mm have more than one focal length?

How can a lens have a range of focal lengths? Shouldn't it be a single number? Isn't focal length supposed to be fixed for a lens of a particular shape and geometry? What am I missing? How many ...