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Old Mar 12, 2010, 1:09 PM   #1
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Default Lens understanding

Somewhat newbe here. I currenty have a T1i with a ef-s 17-85 lens. I am looking to upgrade to a L lens. I rarely have the need for the 17 - 24mm range on this lens. Most shots are in the 30+mm range and it will be my primary walk around lens. I also have a 70-200 for longer range but don't take it with me for everything. If I purchased a 24-105 ef lens will the 24mm mark be the same as it is on my 17-85 ef-s. If it is not could you give me an idea of looking through my 17-85 what I would have to zoom to for it to be the 24mm mark on a 24-105 lens. Thanks in advance..
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Old Mar 12, 2010, 1:23 PM   #2
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yes, the 24 mark on the 24-105 will have the same field of view as the 24 mark on your 17-85. The 24-105 is a great lens and a very nice step up from the 17-85.
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Old Mar 12, 2010, 2:43 PM   #3
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Thanks for the quick respone. I was not understanding what people meant with the full sensor vs crop sensor and if I would lose what I could fit in a picture frame.
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Old Mar 12, 2010, 2:47 PM   #4
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SENSOR is another question entirely. How 24mm looks on your camera and how it looks on a 5dII (full frame) or 1d3 (1.3 crop) is completely different.

So to summarize. On an aps-c camera like yours 24mm ef-s lens looks the same as 24mm ef lens. But a 24mm ef lens does NOT look the same on full frame, aps-h (1.3) and aps-c sensors.
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Old Mar 14, 2010, 7:29 PM   #5
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I have the 24-105mm and on my Canon 7d the crop factor is 1.6 I believe which would translate to 38.4-168mm(full frame equivalent)
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