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    Should on-lens stabilization be on or off when filming video?

    Greetings, I use a sigma lens with OIS and should I have it off or on when filming video? Because I know that the D7500 has electronic stabilization for video, so does that mean I should have OIS off, or can they both be on? Or would it be better to turn off electronic stabilization, and use...
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    Turning off OS on Sigma lens, but still see hand symbol on the LCD. Is this normal?

    Greetings, Turning off OS on Sigma F2.8 ex dc os lens, but still see hand symbol on the LCD display. Is this normal? Is there something a 2nd step that I need to do to ensure OS or VR is turned off? Thanks!
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    Using external flash without TTL, can I still leave camera flash control in TTL mode?

    Greetings, For D7500, when using an external flash that does NOT support a TTL mode, do I need to set flash control on the camera to manual, or can I still leave flash control on TTL mode regardless? Thanks for any advice.
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    If strobe is 1/2000 and sync speed is 1/250, how it works with longer shutter speed?

    Greetings, This is a rookie question. Given when using the non-high speed external strobe flash units, why are we not getting underexposed photography given the shutter speed is opened much longer than the length of time the flash is actually on (leaving most of remaining length of the shutter...
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    Using Sigma F2.8 EX DC OS lens in manual, need to set camera body to manual as well?

    Greetings, I know that we don't need to set camera's body to manual focus if using AF-S lenses. But what about in the case of this Sigma lens? Thanks for any advice. :)
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