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That sounds right, there wouldn't be any visual indication of vignetting, but I thought there might be some loss of brightness on some objects due to less light falling on the corrector?
On the the plus side, unwanted stray light falling on the corrector is reduced or removed completely.
I have no choice but to use a heated dew shield in winter as we get heavy dews, but I am also wondering if using a heater strap has any advantages?
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