Alley in Pisa, Italy

by Lars Kotthoff

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3
votes
1answer
343 views

Why does my camera make a whirring noise during a long exposure?

I have a Sony Alpha a55. When I take a long exposure photo, while the shutter is open, the camera makes a whirring sound. What causes this noise and why is it necessary to the camera's operation? ...
3
votes
2answers
1k views

Does the Sony A77 have a shutter?

I bought the new Sony A77 last month and I am interested to learn about how its translucent mirror technology works but couldn't find enough information on it. My question is: does it have a shutter? ...