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PostPosted: Fri Nov 30, 2007 8:40 am 
Alright, this may be a foolish question, but I cannot find any information on what exactly constitutes a wide angle lens. Do all lenses have wide angle capabilities, or are you looking for certain models? Any help would be much appreciated.


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PostPosted: Fri Nov 30, 2007 10:43 am 
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Hi SoccerandDMB,

Not foolish at all! May I start by describing a "normal angle" lens?

On a cropped sensor camera like the 400D/XTi a lens with a 30mm focal length gives a roughly natural perspective. It's difficult to explain well but when you eyeball a scene you see a reasonable degree of detail in an area around the point you are looking at and far less detail in the periphery. The 30mm lens captures that central area that the eye is sharper at and so when you look at the picture it produces then that picture looks normal. Does that make sense?

So, again restricting this to cropped sensors, a lens with a focal length quite a bit shorter than 30mm is "wide angle". Zoom lenses which start at around 18mm would certainly qualify when used at that focal length.

Bob.

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Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


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PostPosted: Fri Nov 30, 2007 4:39 pm 
That makes a decent amount of sense.

So what about just the kit lens on that Xti. I believe it starts at 18mm. That would work for wide angle purposes?

Are there any lenses that there sole purpose would be wide angle shots?


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PostPosted: Fri Nov 30, 2007 4:52 pm 
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Yes, the 18-55 covers from wide angle through to short telephoto (see Gordon's XTi kit lens upgrade group test. For an ultra-wide angle possibility have a look at his EF-S 10-22mm f/3.5-4.5 USM lens review.

Bob.

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Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


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