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Ian
My experience with a manual filter wheel has been that ambient light inevitably gets into the housing through the slot where one touches the knurled edge of the internal carousel in order to be able to rotate it. This light pollution adversely affects the quality of your images. An electronic filter wheel is a virtually sealed unit and so prevents the ingress of unwanted ambient light.
One can take steps to mitigate the problem with a manual wheel by providing some form of light shroud around the wheel but if you can afford it I strongly suggest that you get an electronic wheel.
David
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