How do I work out my min shutter speed. I've got a nikon d3100 with a kit lens and a 55-200mm lens. Also is it a definate no no to go below that shutter speed if not when is it acceptable?
It's a guide, not a rule. Some people can shoot at really slow speeds handheld, others can't.
The guide is have your shutter speed faster or equal to your focal length. With your camera you need to add a bit more due to the crop factor. So at 200mm, you want to be shooting at 1/250th.
The shorter the focal length the less important this becomes.
People usually say the min same as the focal length.
So, 1/50 to 1/200 for each end of the zoom range.
Really it depends how steady you can hold the camera so maybe the best thing to do is to shoot some test shots and see if you're happy with the images and the amout of blur at various shutter speeds.
Personally although I have handheld a shot at 2 seconds I could probably try that another 100 times and not do it again and I'm happier with something like 1.5-2x the focal length. So for me that'd be 80/100 at the wide end and 300+ at the long end.
You can also up the ISO if you're struggling to get a quick enough shutter speed, but this will adversly affect the picture quality. It's all a bit of a balancing act really.
With the crop factor taken into account your lens becomes effectively a 300mm, therefore you should be looking to use a shutter speed of around 1/320th of a second at full zoom.
In order to do this you can adjust the aperture and also increase the ISO.
Bear in mind that this is just to counter camera shake when hand holding a shot, if your subject is twitchy or moving fast you may need to use a much higher speed.
With crop bodies you need to factor in the crop factor and then work out the shutter speed from there.
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