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To take better food photos, should I buy another lens for my canon 550D 18-55mm? Or is this camera "too old" already and I should simply get a new camera? OR maybe just a new phone that has good camera...(my friend has the latest iphone, and it takes a sharper picture than my 550d..)

thank you

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    This is just far too broad. What do you consider 'better'? Sharper, higher saturation/contrast, lighting, depth of field, perspective... – Tetsujin May 10 at 9:56
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    If your main issue is the image quality from your equipment, post some images (with shutter speed/aperture/ISO) and we can probably help you; the 18-55 is perfectly capable of sharp images in good light when stopped down a bit. You may want to read Why are my photos not crisp?. – Philip Kendall May 10 at 10:34
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Though I mainly agree with Juhist's answer I feel there is an alternative, with far less outlay.
(Though we would still like to see some specific images with some specific, named issues)

If your issue is lighting, making focus &/or camera shake an issue, then why fix it with faster lenses for several hundred dollars, when you could fix it with… lighting.

If you Google 'beginner's lighting kit' you will find a) tutorials on how to use this stuff & b) very simple lighting kits such as this for about $£€ 70 [no specific maker recommendation, these things come with a dozen different names on the side, all essentially the same thing]

enter image description here

It's cheap, it's cheerful, it's more than enough to get you started.

By the time you know what your next lens is for, then is time to look for it. If you don't know why you need it, you don't need it yet.

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Depends on where you shoot (indoors/dark vs sunlight) and whether your 18-55mm is image stabilized lens

Food is non-moving. You only need one (or at most few) shots. You can usually fill the frame with the subject so 18 Mpix is plenty. Thus, food photography is about the easiest photography to do when considering camera features.

One of the benefits of many 18-55mm lenses and crop cameras is that they achieve quite acceptable macro distances. Not good enough for insects, but definitely good enough for food.

However, if you shoot your food indoors, you will find that the indoor lighting is very dim. It's darker indoors than what you think. Thus, your shots can end up being shaken if shot without image stabilization at the dim apertures of the 18-55mm zoom lens.

Thus, if you find your shots are shaken, and if your 18-55mm is not a stabilized lens, replace the old 18-55mm lens with an image-stabilized 18-55mm lens. I suggest going for either (1, 2) of the STM versions of the lens; it's much better value because it can shoot video without autofocus ruining the audio track. It also doesn't sound like a child's toy when focusing, which is a plus. The older of the STM lenses has better maximum magnification, so for food shots I would prefer the old f/3.5-5.6 STM over the new f/4-5.6 STM.

If you want to achieve shallow depth of field effects for your food shots, add the 50mm f/1.8 STM lens to your kit. Its improved close focusing distance over the old 50mm f/1.8 II lens allows easier food shots.

Your camera is not too old. Its resolution is good enough. Its low-light performance may be slightly dated, but not too much. Buying a better camera can be a step backwards, as e.g. a full-frame camera is worse to take photos of close subjects due to its large sensor, and full-frame camera does not usually accept crop lenses (or if it does, with a reduced resolution) so you need new lenses too -- the best zoom lenses tend to have slightly worse minimum focus distance than the cheap EF-S 18-55mm lenses.

Thus, my suggestion is the "EF-S 18-55mm f/3.5-5.6 IS STM" lens (but only if your current 18-55mm lacks a stabilizer), and the "EF 50mm f/1.8 STM" lens. You should expect to pay $300-$400 for both of them together. Especially the 18-55mm stabilized zooms can be often found very cheap as second-hand items (sub-$100 where I live) so even $200-$300 might buy you a good food photography kit. If buying 18-55mm used, ensure it is an image stabilized version. If buying 50mm used, ensure it is the STM version with improved minimum focus distance.

The easiest way to improve colors and contrast of any photographs taken is to use a lens hood. Fortunately, the EF-S 18-55mm lenses accept an EW-63C petal hood. The 50mm lens accepts a slightly worse ES-68 circular hood. Be sure to buy both of them if you find your colors and contrast lacking.

Once you have the most suitable lenses and hoods for them, if you want to improve your photographs even more than the lenses can help, shoot RAW and download Canon's Digital Photo Professional. Use the Digital Lens Optimizer feature and learn how to correct the exposure and set other settings.

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    Sorry, but "The easiest way to improve colors and contrast of any photographs taken is to..." light it properly. – Michael C May 10 at 17:10
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I'll add a third answer. Two approaches to improve low-light shots were suggested (faster/stabilized lenses and better lighting).

There's a third way, too. Stabilize the camera by using a tripod. Then camera shake can be completely eliminated with no need for image stabilization.

There are tripods of many sizes. Some are large enough so that their legs reach the ground. There are also smaller tripods that are intended for used by placing them on a table. If photographing food not at your home, you might prefer a smaller tripod.

You can even find one-legged "tripods" called monopods (although strictly speaking it's not a tripod because it does not have three legs). They stabilize only some of the camera shake in some directions, so you cannot improve camera stability as much as you can with a three-legged tripod. But it's easier to carry a monopod with you than it is to carry a tripod.

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