D5100 Manual Control In Liveview

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Re: D5100 Manual Control In Liveview

Postby fever003 » Wed Dec 18, 2013 6:46 pm

Thanks coderat for the reply.

I just want to confirm whether what I am doing is right or not.

I prefer full manual.

THe auto exposure gain is a pain actually.

Which means, now I just need to adjust mostly shutter speed for my videos to perfectly exposure the videos depending on what aperture I use.

I think the rolling shutter speed 1/50(24fps), 1/60(30fps) isn't that much of an importance to me.


Thanks everyone!
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Re: D5100 Manual Control In Liveview

Postby coderat » Wed Dec 18, 2013 7:05 pm

Please reread my message above, I add "EDIT:" section. So generally using F2.8 and 1/4000 shutter you are not in danger of rolling shutter. Rolling shutter comes exactly in another way, when shutter speed is too slow, means close to 1/50s or 1/60s.

Why it is so: usually you need 1/200s or even smaller (=faster) shutter speed to catch people moving like in sports. The problem is during video no way to close or open shutter - it is actually always opened. So there is "electronical shutter", BUT the sensor stays open and exposed all the time in video. Reading sensor is slowly and is done line by line. At this time light is still gathered by pixels so picture is still changes during one frame of video is read. This is in turn, because DSLR sensors have no global shutter, so they can't lock all pixels on sensor at same time. Only camcorder sensors (not all models) can this at the moment. That is one of the differences between DSLR and camcorder.

The second difference is that sensor is bigger in DSLR (allowing high ISO, much better as with camcorder), BUT because of this you have very small DOF and very few things are in focus at same aperture number. So if you need all sharp must go with aperture f/11 or even smaller (=bigger f-stop number). But usually at f/16 it is back unsharp, because of "difraction" effects.

3rd difference is 3CCD camcorder do not have Bayer-pattern, so no approximation of pixels is need. Each pixels has its R, G, B component which are not calculated from neighbour pixels. So picture quality is much better or even natural.

So mention these differences when you film. DSLR is in no way a camcorder and making "movies" with DSLR is something different from "recording with camcorder".

Best regards,
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Re: D5100 Manual Control In Liveview

Postby fever003 » Wed Dec 18, 2013 7:39 pm

Thanks Coderat. Sorry about the misunderstanding!

:) I will play more with the settings to understand what I need. Am still learning!
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Re: D5100 Manual Control In Liveview

Postby AluK » Thu Dec 19, 2013 4:16 am

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Re: D5100 Manual Control In Liveview

Postby coderat » Thu Dec 19, 2013 8:05 am

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Re: D5100 Manual Control In Liveview

Postby AluK » Thu Dec 19, 2013 8:18 am

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Re: D5100 Manual Control In Liveview

Postby coderat » Thu Dec 19, 2013 8:26 am

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Re: D5100 Manual Control In Liveview

Postby Fried Crispy » Thu Dec 19, 2013 2:26 pm

My auto-focus blacks out the screen when in use (D5100). Is anyone else experiencing this?
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Re: D5100 Manual Control In Liveview

Postby coderat » Thu Dec 19, 2013 2:31 pm

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Re: D5100 Manual Control In Liveview

Postby Fried Crispy » Thu Dec 19, 2013 10:56 pm

I found an explanation on this page:
viewtopic.php?f=2&t=1609&start=70

I can see your frustration. The short workaround would seem to be adjusting the shutter speed over 1/40, focusing, and then dropping the shutter down if needed. It's still a great step forward, sorry you guys are getting plagued by the same question again and again.
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