The 50mm f1.8 is great for low light - but the lens is a bit slow in reaction time when your subject is moving.


Below is one taken with the 50mm f1.8; taken at f1.8, 1/50 second exposure, 800 ISO - manually focused as due to the low light conditions auto focus would not work. BTW: Taken at a zoo enclosure than forbid flash photography. The only source of light was a very dim blue light bulb about 3 feet way (maybe the same brightness as a candle). I could hardly see this little guy with the naked eye.


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So the 50mm f1.8 is great for the price and works great in low light if you can minimize your subject's movement. You will never get a good shot of 2 year old kids high on sugar running around a church using this lens, but for the couple posing it will work great. So at the Museum if you are taking pictures of things in the museum then it should work great - even better if you can carry some small tripod.


Also the 50mm F1.8 generates very little distortions of the subject. If you take your pictures in RAW format then you can use the Canon tools and apply a lens correction. The 50mm is very close to the perception of the human eye so for museum type things you will get great visual results.