Why no digital ISO50 ?

Started Nov 17, 2012 | Discussions thread
kb2zuz Veteran Member • Posts: 3,202
Re: They do... kind of

Adding an ND filter to an SLR is a bit more complex as there is a mirror and it's motors in the way, and the filter would have to be quite a bit larger than in a compact or video camera with a small sensor, so the mechanism to move it and the filter itself would make the camera quite a bit bigger. The general approach and logic has been it has been easier for them to just make the shutter faster. My Canon FTb from the 70's had a flash sync of 1/60th and a max shutter speed of 1/500th of a second. When X-syncs went to 1/125th and max shutter speeds went to 1/1000th, that's similar to adding a 1 stop ND filter. Now cameras have around a 1/200th x-sync, but also have HSS systems that can sync the flash at maximum shutter... up to 1/8000th of a second it's like having a 4 stop ND filter over where we were at 1/500th in the film days.... if you concider that you needed 1/60th if using fill flash and now we can HSS at 1/8000th it's like a 7 stop filter. Life is great!

If you're using an f/2.8 lens in bright day light, going by the sunny 16 rule you'd need about 1/3200th of a second which most cameras can do easily. You can open up to about f/1.7 and still have a 1/8000th of a second that many people can use. If you go crazy and have an f/1.2 lens then you might have an issue because you'll need closer to a 1/15000th of a second, but it is very rare that people want to use f/1.2 in bright daylight, but screw on ND filters are still an option if that is important to you.

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