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Old Dec 1, 2003, 10:34 AM   #1
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Default Rebel Lens Help?

I recently purchased the Canon Digital Rebel Kit with the 18mm-55mm canon lens. I would like to purchase a better zoom lens to go with the camera possibly the EF 55-200mm. Can anyone tell me how to figure the magnification value on a lens. I would like to get something that is about 5x or 6x and I am not sure what this canon lens would equate to. Also is there any other lens that would be recommended.

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Old Dec 1, 2003, 10:50 AM   #2
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FYI

http://www.stevesforums.com/phpBB2/v...290&highlight=
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Old Dec 1, 2003, 10:51 AM   #3
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Dude

The magnification you're talking about is what you usually see on point-and-shoot type models. All the Nx figures tell you is the focal range (i.e the shortest and longest focal points). Typically, a 28-70mm lens has a magnification of 2.5X (70/28), and a 100-400mm lens has a 4X magnification.

Hope this helps
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Old Dec 1, 2003, 12:58 PM   #4
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What type of photography do you want to do? Describe in some detail, please. How much light will there be? Will the subjects be moving (kids playing soccer? Dog running around a field?) How much money do you have to spend? Will you use a tripod or a flash?

As to the "x" factor, read the link that NHL listed. It basically explains how the "X" factor isn't really the right way to think about 35mm lenses. For example:

100-400 = 4x
30-120 = 4x

But you would use those lenses for completely different things. So "x" isn't the right way to think about it.

Eric
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Old Dec 1, 2003, 3:10 PM   #5
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I'm told by the sales rep that you need to multiply by 1.6 to get the true zoom on the Digital Rebel 300D. If this is true then the 55-200mm is actually 88-320mm which is 3.6X.
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Old Dec 1, 2003, 4:08 PM   #6
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Quote:
I'm told by the sales rep that you need to multiply by 1.6 to get the true zoom on the Digital Rebel 300D. If this is true then the 55-200mm is actually 88-320mm which is 3.6X.
Actually it's the same number regardless of the 1.6x crop factor: -> 200/55 = 320/88 = 3.6x

What you're getting is instead of a 200mm at the long you now have 320mm, which is 6.4x(320/50) time the magnification of a normal lens instead of just 4x(200/50)!

So what are you losing? The wide angle... Instead of a 55 which is a normal lens, you now have a short 88mm tele, and what used to be a good 28mm wide angle is just a ~45(28 x 1.6)mm normal lens... That's why everyone need that EF-S 18mm-55mm(29-88mm) zoom. :twisted:
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Old Dec 1, 2003, 5:49 PM   #7
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The 55-200 is a nice match for the 18-55 because one takes over from where the other leaves off (55mm).

I had the 55-200 for two weeks and then gave it to my father. it's a relatively slow lens and you're likely to get blur when hand-holding at 200mm in low light. I've since upgraded to the 75-300 IS which adds image stabilization. It costs twice what the 55-200 does, but I think it's worth it.

All I want now is a 50mm f/1.4 or 1.8 and I'll be done.

FWIW...
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Old Dec 2, 2003, 4:13 AM   #8
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What I have come up with to cover a reasonable range of focal length for my 300D is a Sigma 17-35 f/2.8-5.4 (the new one due 12-12-2003), and the Canon 28-135 IS USM f/3.5-5.6. I do have the 18-55 ef-s, but I would prefer better optics, and the above lenses are within a working mans budget.

This would give me (and pls correct me if I'm wrong here guys!) the following range:

17-35 *1.6 = 27-56 = 1X (Covers the wide)
28-135 * 1.6 = 44-216 = 4X. Then you can go with a 1.4X teleconverter and get 300mm = 6X.

There,s no gap here in focal range between the lenses.

If you then want a serious amount of zoom, you can always add a Canon 100-400, a Sigma 50-500 ... and put teleconverters on top too. (Big tripod territory here folks)

I hope the balance between the 17-35 and the 28-135 doesnt mean consistently having to swap lenses for general snapshot type photography, so I imagine the 28-135 will be the primary lens that lives on my camera.
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Old Dec 2, 2003, 5:18 AM   #9
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Quote:
If you then want a serious amount of zoom, you can always add a Canon 100-400, a Sigma 50-500 ... and put teleconverters on top too. (Big tripod territory here folks)
One needs to be careful with AF camera especially with a 2x teleconverter on small aperture lenses such as the ones above. The autofocus is usually lost as the lenses get darker... and also the shutter speed will become so slow with the combo that's unless it's bright sunshine their use is rather limited (a 1.4x with the corresponding lessening lost in f-stop may be more practical since one already has the 1.6x from the camera).

IMO a 70-200 f/2.8 is much more useful... Think about how much an equivalent 300mm f/2.8 would have costed with a regular full-frame film camera (after the crop factor). This will give you the best defocus DOF that 'cheap' money can buy to 'pop' your subjects from their blurry background, and still be useful in low-light (or with a teleconverter)!

BTW... there's always the 120-300mm F2.8... :lol: :lol: :lol:
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