For the exposure control function DSLRs there are specific shutter speeds available. For example there are 1/4, 1/100, 1/500. Why, even in high end DSLRs, is there no option to use a custom shutter speed (such as 1/19)?
If the camera can do 1/4000, why can't it do 1/33?
Similarly, why are the aperture choices limited?
Why is it a technical challenge to add extra shutter speeds or aperture settings?
Answer
Most DSLRs let you choose shutter speed and aperture at 1/3 of a stop difference (3 clicks of the dial to double or halve the amount of light), I'm not a camera designer but I would guess that since 1/3 of a stop is a small difference being able to set exact shutter speed isn't worth the extra electronics and software to support it.
For aperture also add to that the limitations of the camera-lens connection.
So, in other words:
1/19 and 1/33 are nearly identical to 1/20 and 1/30 that are supported.
This feature will be slower to operate than just turning the wheel so pro won't use it
This feature will be complicated so amateurs won't use it
You can use the time it would take to develop this feature to work on features people are actually willing to pay for.
If you were a camera designer what would you have done?
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