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60D = 755g 600D = 560g

Both are built on an aluminium chassis. The only difference I can think of is a pentaprism. Is it really that heavy? Almost + 200g

What are the other heavy parts?

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Unless I'm mistaken, the 600D is a plastic chassis, not aluminium. What's your source for saying it's aluminium? –  Philip Kendall Oct 11 '13 at 7:41
    
Dpreview says the body material is "Stainless steel and polycarbonate resin with glass fiber." –  Esa Paulasto Oct 11 '13 at 15:44
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Should the title really be changed to "why is camera x heavier than camera y?"? I like the idea of a generalized question, but thus far the answers and really the question are specific to these models. –  dpollitt Oct 11 '13 at 17:08
    
@EsaPaulasto Canon's own specs list the 600D as "polycarbonate". Canon lists the 60D as "polycarbonate resin with glass fiber on an aluminum chassis." –  Michael Clark Oct 21 '13 at 13:04
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At any rate, in the context of this discussion, the three largest factors are the difference in battery weight, size difference between the two bodies, and the solid pentaprism (made of fairly dense material) vs. the hollow penta-mirror. –  Michael Clark Oct 21 '13 at 20:40
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2 Answers

up vote 13 down vote accepted

Canon lists the body-only mass of the 60D at 675 grams and the 600D at 515 grams. These numbers are without batteries. Include the batteries and the 60D is the 755g you quote in your question, but the 600D is only 540g.

  • The 60D chassis is polycarbonate resin (plastic) with glass fiber on an aluminum chassis and moderately weather sealed. The 600D chassis is polycarbonate resin with glass fiber. It uses some internal stainless steel, but it is not really a metal chassis.
  • The 60D uses the LP-E6 battery (2.9 oz./82g), the 600D uses the LP-E8 (0.8 oz./23g), so 60 grams of the total difference is the battery weight. That is a little more than 1/4.
  • The volume of the L x W x H measurements of the 60D is about 13% larger than the 600 D. When sitting them side by side, though, the boxy, rectangular 60D appears more than 1/8 larger than the angular 600D. Assuming uniform density, 13% of the 560g mass of the 600D is 72 grams., that is roughly another 1/3 of the difference.
  • The 600D viewfinder uses a pentamirror which is basically a hollow construct with five mirrors for walls. The bottom and rear are 'two-way' mirrors to allow light in from the bottom and out through the back. The 60D uses a pentaprism, which is a similarly shaped but solid piece of fairly dense material.
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Also found this http://www.cameradebate.com/2011/canon-60d-vs-600d-t3i/ Some nice comparison

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It inaccurately reports the 600D has a pentaprism instead of pentamirror. –  Michael Clark Oct 11 '13 at 10:46
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A lot of the other analysis seems to be pretty rubbish as well; for example claiming that the 60D's 1/8000s shutter speed makes it a better sports camera than the 600D's 1/4000s - in my experience, 1/1000s is good enough for almost all sports. (There are reasons the 60D is a better sports camera, but this isn't one of them) and also claiming some image quality differences between the sensors, which we know are de facto identical. Looks to me like another one of those dodgy comparison sites to be avoided. –  Philip Kendall Oct 11 '13 at 12:36
    
The sensors are the same, but the default in-camera processing instructions aren't necessarily identical. If 'image quality' means jpegs produced in-camera, then the difference between the two will be due to the instruction set. For instance, when the 7D first came out a lot of people complained the images were soft. We eventually discovered that a sharpening setting of "1" for a 7D was not the same level of sharpening as a "1" setting on other current Canon bodies. The tradeoff in the in-camera instructions between things like contrast/sharpness/detail and noise varies from model to model. –  Michael Clark Oct 12 '13 at 18:51
    
But in general I agree with you that the review at the link isn't the most accurate and comprehensive comparison I've seen. That's also not to mention that the answer here does nothing besides link to it without giving us any idea of what the link contains, as is the preferred way of answering questions here. –  Michael Clark Oct 12 '13 at 18:53
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