Question about Sigma AF 28-200 Lens

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Zoom lens My zoom lens on my digital camera suddenly quit moving it's full travel distance and when that happened it corrupted the flash card.  With a new flash card the lens works but still doesn't travel it's full distance. The lens is 28 - 200 but now it only moves from about 55 - 100.

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What camera are you using is the lens making a noise when it stops focusing  call sigma imaging uk 01707 329999

Posted on Dec 13, 2008

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Posted on Jan 02, 2017

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Canon EOS Rebel T2i Digital SLR Camera + 28-80mm Zoom Lens + 70-300mm Zoom


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on Jul 13, 2010 | Cameras

1 Answer

Batteries Dead and lens wont retract.. I just got


There are some cameras who give problem when they are new. Give it some time i am sure it when the battery is on the move it automatically repaired.

Aug 19, 2013 | Olympus SP-820UZ iHS Digital Camera, 14MP,...

1 Answer

Fuji Finepix F30 Suddenly takes only all pink screens (no image)


This sounds like one of two problems -
Either an LCD screen problem or a bad CCD sensor.
A LCD screen problem would indicate one of two of the following - it was cracked, or the cable inside is either damaged or moved out of the plug and need to be reseated.

A bad CCD sensor would show a pink screen on cameras, but would also show menus on the screen as well, do you see those? The CCD basically captures the image the lens is seeing and translates it to an image the camera can save. Generally the CCD can not be replaced separately from the lens and will require an entire lens assembly for repair.

Mar 16, 2010 | Fuji FinePix F30 Digital Camera

1 Answer

How to shoot night scene with people dancing?


You could use flash. Depending on distance, you might want to go with one of Nikon's add on flash units. SB-600 is very cost effective.

You could also buy the excellent f1.8 50mm lens that Nikon makes. It's about $120 new. It's a prime lens (no zoom/telephoto) but it is one of the best lenses Nikon makes. It works very well in low light. There are also some other large aperature lenses, but cost goes up as f goes down!

May 03, 2009 | Nikon D70s Digital Camera

5 Answers

I want a nature camera


First, to answer your lens question, 400mm is unlikely to be adequate. On a digital camera this is going to give only 6x magnification. Some nature subjects will require much more than that.

Also, do not need a fully featured 'pro' camera. These have features which you may not want. Look at lenses first, and let that dictate the camera.

It rather depends on your intended subject matter, but in general for nature photography (I presume you are thinking of vertebrate animals, rather than plants or insects.) you require very long focal length lenses. This is because wild animals are very difficult to approach, and many are comparatively small as well. As an example, you may only be able to get within 30ft of a heron however well you are hidden, and for a bird that size at that distance a 400mm lens will just be big enough. Just.

As a rule you want to fill the frame. So to work out what focal length you need you need to work out the size of the image in the camera. This is not difficult to work out, as the magnification is only the ratio of the subject to lens distance to the (Thoeretical) film/sensor to lens distance. (Most long lenses are physically shorter than their theoretical focal length. That's the true origin of the word 'telephoto', the lens is optically 'telescoped' into a shorter package.)

In reality this varies a little as the lens moves in and out to focus it, but in practice you just use the focal length of the lens. So for out Heron which is about 10,000mm away with a 400mm lens the magnification is 400/10,000 = 4/100 =.04. A heron is about .5m tall (18inches roughly), and 500mm x 0.05 = 20mm. The hieght of a digital sensor is about 16mm, so that's full height, but a heron is a tall bird, so portrait mode might be better, and that will be closer to 24mm.

So in our example, a 400mm lens will do but only for an animal half a meter in size, if you can get thirty feet away. And that's pushing your luck. (The nearest I ever got to a heron without sitting all day in a hide hoping for it to show was twice that distance!)

Most subjects will be smaller, or further away. Getting within 150ft of a deer in clear view is quite a challenge even for an expert stalker. At 1.5m tall with a 400mm lens, the image will be 12mm high. If the subject is a grizzly bear, then I doubt you would want to be that close.

Of course if you are wanting to photograph smaller animals, then the problem is compounded. Especially if they are easily spooked.

In essence you want as long a lens as you can manage, so you can photograph from a comfortable (for the amimal) and safe (grizzly bear) distance. However, as in many instances you won't be able to control that, and the range of animals you want to photograph will vary in size, you really want either more than one lens, or a really good zoom.

Really good zooms of long focal length are very expensive, so two lenses might be a better option, or a long lens with a factory matched multiplier would be almost as good. (Zoom lenses cannot perform at optimum over all the focal lengths available, so really good ones are difficult to design and make.)

So you first need to decide what focal lengths you need.

Then you have to consider camera shake. As a rule of thumb you need an absolute minumum shutter speed of 1/(focal length in mm) for hand-held shots. As you will be using long lenses, with small apertures, you won't be able to take shots hand held.

One (partial) solution is to use an image stabilized or shake reduced system.

Image stabilization is built into the lens, and works by moving optical elements to compensate for vibrations. This makes the lenses much more expensive, and will eat batteries. This has the advantage that it is always optimal for the lens.

Shake reduction moves the sensor in the camera, to achieve the same effect. It makes the camera a little more expensive, but the lenses are a lot cheaper, and that's where most of your money will go!

(Note, that digital image shake compensation is not the same thing, and reduces the image sharpness.)

Of course the traditional solution is a really sturdy tripod. Most tripods are simply not up to the job, so you need to check out as many reviews as you can. But be aware a really good tripod will not be cheap.

The camera mount must be really rigid if the camera is not to move during exposure (A camera with a mirror-up function can help. The mirror is the Major source of vibration in a camera, this allows the mirror to flip well before the shutter fires allowing time for vibration to die away.) and the tripod itself must not flex or twist.

A tripod with the means of suspending a weight underneath is useful, extra weight will make sure the tripod feet are firmly placed and help pre-stress the tripod so any residual 'slack' is taken up. (A simple hook that you can hang a kit-bag on will suffice!)

A good tripod and head could cost £200 or more alone!

As for selecting the lenses....

Canon do some very long focal length lenses but they are also very expensive (£2000+) These include a zoom with image stabilization, and a dedicated multiplier to double the range. A good used example will cost over £1000.

However, you should be aware that Canon are generally quite expensive, and other manufacturers produce similar systems, at various prices. I would look at Nikon, and Pentax, these brands are still well regarded.

Jan 23, 2009 | Canon EF 70-200mm f/2.8L IS USM Autofocus...

1 Answer

Distance scale does not move on canon efs 17-85mm lens


Yes, this is normal. Some zoom-lenses adjust the focus when zooming, to always keep the subject in focus. Those tends to be the more expensive lenses.
So you don't have to worry, nothing is wrong with your lens.
/Chris

Jan 10, 2009 | Canon EF-S 17-85MM F/4-5.6 IS USM Lens

1 Answer

My Nikon D50 camera says


It thinks that the SD card is full - try re-formatting if you have no photos there. The SD functions the same as a PC hard drive, and if the directory 'tracks' are corrupt, anything could happen. Else try a new SD card.

Jul 04, 2008 | Nikon D50 Digital Camera with Nikkor AF-S...

1 Answer

Camera really messed up!


Have you tried taking out the batteries and leaving it alone for a bit, then loading new batteries? I would try this first before anything. Good Luck.

Apr 09, 2008 | Casio Exilim EXZ75 Digital Camera

1 Answer

Zoom


have you tried to check the mode or settings? Digital zoom is different from manual or analog zoom, when we say digital zoom the camera expand the picture digitally, the zoom lens is not moving when it reach its maximum length but the picture keeps on zooming in.

Sep 29, 2007 | Canon PowerShot A95 Digital Camera

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