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Old May 9, 2006, 8:27 PM   #1
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I currently own a Kodak DX6490 with a 38-380 (equiv) 10x lens. I am soon going to step up to a EOS 30D but at this point I know nothing yet about the lens I need or what the numbers mean. In other words I see these physically bigger lenses than what I have and for instance one that may say 35 - 200mm. I don't know how to compare that to what I already have. I want a long range lens for bird photography but as yet as I have said I don't understand. Once I know how to compare then I can start to search for a lens. Now I can get some decent closeups up to 20 30feet but I want more say up to 150 feet plus.

I tend to ramble so I hope you understand what I just said <g>.

Thanks

Jim
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Old May 9, 2006, 10:42 PM   #2
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Old Jim wrote:
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I currently own a Kodak DX6490 with a 38-380 (equiv) 10x lens...
They already gave you the 35mm equivalent lenses which is 38-380mm for a full-frame 35mm camera

Now the 30D is an APS size camera, which is smaller than a 35mm full-frame, hence you need to multiply the focal lenght by 1.6x (which is also referred as the crop factor)
-> A lens say of 35 - 200mm will actually be equivalent to 56(35x1.6)-320(200x1.6) on the 30D - Slighly longer than 38 but shorter than 380...

The 10x is just the ratio (i.e. 380/38 ), and has nothing to do with the magnification. For example a 50-500mm also has a 10x ratio (i.e. 500/50), but the magnification is higher than a 38-380!
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Old May 10, 2006, 2:25 AM   #3
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And a 600mm prime lens is not a zoom at all - so I suppose you could say it is a 1x.

But 600*1.6 = 960mm equivalent which is fairly handy for birds!

But for small wildlife forget about being 150ft away.
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Old May 10, 2006, 6:01 AM   #4
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Old Jim

Are you particular about any 1 brand?
The crop factor actually favors you in birding... and longer range :idea:
For example an Olympus dSLR goes for 1/2 price of the 30D, but it has a 2x crop instead of 1.6x (both 8Mpixels cameras): http://www.costco.com/Browse/Product...av=&browse

A 120-300 f/2.8 zoom has then the equivalent focal lenght of 240-600 @ f/2.8
-> The difference here is the price and weight in going for a 2x cropped camera (and a 120-300):
a) You just can't shoot handheld with a 600mm since a tripod is always required
b) A 600mm will cost many times more than the camera
... and lastly c) A fast 600mm f/2.8 just doesn't exist on a 30D!

IMO a reasonable 50-500 with an Oly is a birder dream (100-1000 equivalent focal lenght!!!)
... and it can shake the dust off the sensor automatically! :lol: :-) :G
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Old May 10, 2006, 10:18 AM   #5
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Yup I'd agree - better and cheaper than a high-quality digiscope.

The Oly camera body is very cheap in comparison to a 600mm lens for the 30D.




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Old May 10, 2006, 6:49 PM   #6
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Thank you NHL and everyone for your replies. No I wasn't really stuck with a Canon. Everything I read about it seemed to be what I thought I wanted. I had never considered the Oly. Can any of you recommend a 120-300 or 50-500 to go with this cam?

I really appreciate your feedback and time helping me on this.

Jim
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Old May 10, 2006, 9:05 PM   #7
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Old Jim wrote:
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Can any of you recommend a 120-300 or 50-500 to go with this cam?
This thread should have everything you need:
http://www.4-3system.com/modules/new...amp;post_id=38
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Old May 11, 2006, 6:22 PM   #8
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Thanks NHL!
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