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06/13/2007 12:00:24 PM · #1 |
Hello,
How can a 50mm fixed focal lenghth lens like the canon 50mm f/1.4 USm be a telephoto lens ?
Then what is the difference between this lens' telephoto capability and the 200mm or 300mm lenses'
Thanks
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06/13/2007 12:05:31 PM · #2 |
urm - i think you might be confusing whst telephoto means - that or not understand what focal length is. Have a look at this to see what happens when you change focal length:
Focal Length Comparison
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06/13/2007 12:10:02 PM · #3 |
A 50mm lens is normally though of as a "Standard" focal length lens. have a look at Canon USA; notice that they are grouped together with medium telephoto lenses, but referred to in the title as "standard."
When we consider APS-C format (1.6-crop) cameras, the 50mm lenses actually have a field of view of an 80mm lens, and thus actually do act something like a moderate telephoto lens. |
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06/13/2007 12:15:31 PM · #4 |
Originally posted by kirbic:
When we consider APS-C format (1.6-crop) cameras, the 50mm lenses actually have a field of view of an 80mm lens, and thus actually do act something like a moderate telephoto lens. |
That's it. And if a 50mm lens were on a medium format camera it would be considered a wide angle lens.
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06/13/2007 12:40:59 PM · #5 |
A "normal" lens for a given film/sensor format is a lens with a focal length roughly equal to the diagonal of the sensor/film.
For an APS-C camera, it's something like 32mm. For 35mm film it's about 44mm. For 6x6 it's 84mm. For 6x7, it's 92mm, and for 4x5 it's about 170mm and so on. |
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06/13/2007 12:56:11 PM · #6 |
50mm is a \'Normal\' lens on a film camera.
However, with the crop factor on a lot of DSLRs this lens becomes a telephoto lens of ~85mm.
Telephoto is a term for focal lengths greater than 50mm. |
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06/13/2007 01:00:03 PM · #7 |
Originally posted by cpanaioti:
Telephoto is a term for focal lengths greater than 50mm. |
No, telephoto is a term for lenses with focal lengths greater than what's "normal" for a given format.
e.g. A 90mm lens is a wide angle lens on a 4x5 camera. |
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06/13/2007 01:11:20 PM · #8 |
Originally posted by Spazmo99:
Originally posted by cpanaioti:
Telephoto is a term for focal lengths greater than 50mm. |
No, telephoto is a term for lenses with focal lengths greater than what's "normal" for a given format.
e.g. A 90mm lens is a wide angle lens on a 4x5 camera. |
You are correct. I was using 35mm film as the reference.
Message edited by author 2007-06-13 13:13:07. |
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06/13/2007 01:12:22 PM · #9 |
If the OP was sort of confused when they came in here. They are going to be totally confused now with all this extra info about medium formats etc... lol
I think Kirbic probably answered the question, As I believe the question stems from how they have the lenses listed on a website.
Ok back to you guys.
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