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Old May 11, 2010, 2:45 PM   #1
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Default Anything to gain with 50mm f1.8?

I'm considering the 50mm f1.8 lens for some museum shots, but I wonder if I really gain anything over the kit lens, considering it runs at f5.6 at 55mm, but with IS?
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Old May 11, 2010, 2:49 PM   #2
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The 1.8 will let you shoot in the museum at higher shutter speeds if you can not set up for a long exposure. And since most museum will not allow you to use a flash, the 1.8 will be very helpful.
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Old May 11, 2010, 4:13 PM   #3
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This would be one of the reason I'd like to get this lens to - shooting in museums, zoos (indoor),... I guess the nifty-fifty would be great for stuff like that!
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Old May 11, 2010, 4:31 PM   #4
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for medium low light, the 1.8 does a good job. When you bring down the light allot, that is when the AF have issues with this lens, and the hunting occurs. Thou I got the 50 1.4, I still keep the 1.8 as a back up on my display eos 630.
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Old May 11, 2010, 6:56 PM   #5
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I'm still thinking that the IS closes the gap, unless I'm missing something, hence the question. I could shoot at f2 at 1/60s with the prime lens, or I could shoot at f5.6 at 1/5s with the kit lens to achieve the same exposure for a given ISO setting. Give or take a half-stop.

So if the subject is moving in low light, 1/60 may be the slowest shutter speed I can tolerate and the bigger aperature wins. For a static object, it seems like both lenses offer the same capability as illustrated above. Of course, I'm asking because there tends to be aspects to this photography thing I haven't thought about just yet.
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Old May 11, 2010, 6:59 PM   #6
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IS will not close the gap that much, i shoot in the dark allot, if you get 1/8 with a lens, the IS will get you to 1/20 or 1/25 only in ability.
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Old May 11, 2010, 7:16 PM   #7
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If I read that correctly as 1/80 to 1/20 with IS, I gain two stops from the IS. So if I can shoot at 1/15s with IS, at f5.6, I have the equivalent exposure of f2.4 at 1/60s on the prime lens. If this is the case I gain one stop by going with the 50mm f1.8 lens. If I can get three stops out of the IS then it's a wash.
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Old May 11, 2010, 7:23 PM   #8
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It not that much, shooting at F2 will yield better results then 5.6 with IS at 55mm. 5.6 with IS will be closer to 4 with the 18-55. The IS get better in the higher grade lenses.
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Old May 11, 2010, 7:28 PM   #9
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there is a lot more math here than i can wrap my head around atm, but i can tell you that in the Shedd Aquarium in Chicago, i tried using the kit lens and it was so-so (no flash), but the 50 1.8 was the one i kept on most of the time. just anecdotal evidence from me, but the prime was far more useful than a kit lens for me
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Old May 11, 2010, 7:40 PM   #10
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Anecdotal as it is, that supports Shoturtle's claims for IS effectiveness on the kit lens and ergo the benefits of the 50mm f1.8 lens.
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