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#1
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28mm or 50mm Fixed focus lens for Canon dRebel
Hi,
The 50mm fixed focus lens is usually highly recommended for 35mm SLRs given its low price and good optical qualities. I was wondering would it be same for digital SLRs with 1.6x crop factor or is a 28mm more suited for dSLRs? Optically, is a Canon 28mm f2.8 as good as the 50mm f1.8 in terms of barrel distortion etc? Thanks, Siddhartha |
#2
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I have the 50mm. It is a sharp lens, but it is too long on the dRebel. The
28mm will give you about the same angle of view as a 45mm lens in 35mm film. I'm not familiar with the Canon 28, but my experience with other 28mm lenses are that they have more barrel distortion and may be softer in the corners at wide apertures. You do loose more than a stop of light going from f/1.8 to f/2.8. The sharpness of the 50/1.8 makes it very useful even wide open. bg "Siddhartha Jain" wrote in message ups.com... Hi, The 50mm fixed focus lens is usually highly recommended for 35mm SLRs given its low price and good optical qualities. I was wondering would it be same for digital SLRs with 1.6x crop factor or is a 28mm more suited for dSLRs? Optically, is a Canon 28mm f2.8 as good as the 50mm f1.8 in terms of barrel distortion etc? Thanks, Siddhartha |
#3
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Siddhartha Jain wrote:
Hi, The 50mm fixed focus lens is usually highly recommended for 35mm SLRs given its low price and good optical qualities. I was wondering would it be same for digital SLRs with 1.6x crop factor or is a 28mm more suited for dSLRs? Optically, is a Canon 28mm f2.8 as good as the 50mm f1.8 in terms of barrel distortion etc? Thanks, Siddhartha For digitals with crop factors those very good and inexpensive ~50mm fairly fast lenses are recommended for portrait work. Keep in mind that any standard 35mm lens you use with a cropping digital will not be able to provide the same total resolution as it can on a standard 35mm since you will be throwing away about 30% of the image the lens could have produced on a full size 35mm. -- Joseph E. Meehan 26 + 6 = 1 It's Irish Math |
#4
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"BG250" wrote in message ... I have the 50mm. It is a sharp lens, but it is too long on the dRebel. The 28mm will give you about the same angle of view as a 45mm lens in 35mm film. I'm not familiar with the Canon 28, but my experience with other 28mm lenses are that they have more barrel distortion and may be softer in the corners at wide apertures. You do loose more than a stop of light going from f/1.8 to f/2.8. The sharpness of the 50/1.8 makes it very useful even wide open. bg I'm not that pessimistic about the 28. Remember, you're not using the corners. Doesn't Canon also make a 28/2? |
#5
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BG250 wrote:
I have the 50mm. It is a sharp lens, but it is too long on the dRebel. The 28mm will give you about the same angle of view as a 45mm lens in 35mm film. I'm not familiar with the Canon 28, but my experience with other 28mm lenses are that they have more barrel distortion and may be softer in the corners at wide apertures. You do loose more than a stop of light Actually, it's about 1/2 stop. ƒ3.5 would be a full stop. |
#6
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Joseph Meehan wrote:
Siddhartha Jain wrote: Hi, The 50mm fixed focus lens is usually highly recommended for 35mm SLRs given its low price and good optical qualities. I was wondering would it be same for digital SLRs with 1.6x crop factor or is a 28mm more suited for dSLRs? Optically, is a Canon 28mm f2.8 as good as the 50mm f1.8 in terms of barrel distortion etc? Thanks, Siddhartha For digitals with crop factors those very good and inexpensive ~50mm fairly fast lenses are recommended for portrait work. Keep in mind that any standard 35mm lens you use with a cropping digital will not be able to provide the same total resolution as it can on a standard 35mm since you will be throwing away about 30% of the image the lens could have produced on a full size 35mm. An advantage of the crop factor is that you're utilizing the central 'sweet spot' of the lens. There won't be very much, if any vignetting, corner softness and barrel distortion. |
#7
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On 8 Nov 2004 02:23:43 -0800, "Siddhartha Jain"
wrote: Hi, The 50mm fixed focus lens is usually highly recommended for 35mm SLRs given its low price and good optical qualities. I was wondering would it be same for digital SLRs with 1.6x crop factor or is a 28mm more suited for dSLRs? Well, what are you using it for? |
#8
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On Mon, 8 Nov 2004 09:56:03 -0500, "Michael A. Covington"
wrote: "BG250" wrote in message ... I have the 50mm. It is a sharp lens, but it is too long on the dRebel. The 28mm will give you about the same angle of view as a 45mm lens in 35mm film. I'm not familiar with the Canon 28, but my experience with other 28mm lenses are that they have more barrel distortion and may be softer in the corners at wide apertures. You do loose more than a stop of light going from f/1.8 to f/2.8. The sharpness of the 50/1.8 makes it very useful even wide open. bg I'm not that pessimistic about the 28. Remember, you're not using the corners. Doesn't Canon also make a 28/2? Canon makes a 28 1.8 USM and a 28 2.8 non-usm |
#9
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YAG-ART wrote:
Canon makes a 28 1.8 USM and a 28 2.8 non-usm The 2.8 is about $165., and the 1.8 $400. |
#10
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"PhotoMan" wrote in message ... BG250 wrote: I have the 50mm. It is a sharp lens, but it is too long on the dRebel. The 28mm will give you about the same angle of view as a 45mm lens in 35mm film. I'm not familiar with the Canon 28, but my experience with other 28mm lenses are that they have more barrel distortion and may be softer in the corners at wide apertures. You do loose more than a stop of light Actually, it's about 1/2 stop. ƒ3.5 would be a full stop. From f/1.8 to f/2.5, or from f/2 to f/2.8, would be a full stop. f/1.8 to f/2.8 is slightly more than a stop. Remember, f-ratio squared is inversely proportional to brightness. Consecutive f-stops (differing by a factor of 2 in brightness) differ by a factor of sqrt(2) = 1.414. |
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