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Old Jul 13, 2014, 12:39 PM   #1
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Default 50mm 1.8 or 40mm 2.8

Got the chance of either an 50mm 1.8 or a 40mm 2.8 Canon lens to use with my 550D.

Which and why people?

I like a prime so that is one box ticked.

Any help would be much appreciated. Going to Rome in 5 weeks so be good to take the 'right' lens! Ta
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Old Jul 13, 2014, 2:51 PM   #2
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What other lenses do you have?
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Old Jul 14, 2014, 3:32 PM   #3
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Old Jul 15, 2014, 7:38 AM   #4
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If you think you'll be taking a lot of indoor shots, I think the 50/1.8 would be a better choice, but if you'll be taking a lot of outdoor shots, I think the 40/2.8 would be a better choice.

I think you might be better served by the 50/1.8 for the indoor shots and an 18-55 zoom for the outdoor shots.
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Old Jul 15, 2014, 11:32 AM   #5
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I have had both, and just sold my 50mm f/1.8. I find the 40 mm better build, and focus....It is very sharp at f/2.8. My 50mm I had to stop down, and still was not as sharp as the 40mm. Also, I would bring a wide lens on your trip, canon kit 18-55, or 17-55, or pick up a Tamron 17-50.....just my thoughts
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Old Jul 15, 2014, 12:51 PM   #6
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Well, cant afford 2 lenses and i prefer a prime. Might go with the 50mm as i will be taking quite a lot of indoor shots in Rome. 40mm would not be as good indoors?
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Old Jul 15, 2014, 3:18 PM   #7
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Quote:
Originally Posted by Koolpc View Post
40mm would not be as good indoors?
The 50/1.8 lets in more than twice as much light wide open than the 40/2.8, so you can use faster shutter speeds and/or lower ISOs.

And while the 40 wide open is sharper corner-to-corner than the 50 wide open, "wide open" means different things to these different lenses. At f/2.8, the difference between the 50 and 40 is miniscule with regard to sharpness.

Plus the 50 has less chromatic aberration
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Last edited by TCav; Jul 17, 2014 at 2:18 PM.
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Old Jul 17, 2014, 12:45 PM   #8
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Thanks Tcav.
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