For owners of TM700, I would like to conduct some low light test tonight. Based from your experience, what setting produced the best image quality? Can you please share your settings?
It is different. In that "Color Night Rec" will use a noise removal algorithm in real time, and will also drop the frame rate to really low numbers (about 4 fps) when needed.
As for the "Low Light" scene mode (the one with the candle icon) on the first page of the record menu, it will drop the frame rate too, but not lower than 30 fps. And will not perform any noise removal so the result will be a picture as bright in both cases, with one having jerky motion but really low noise, and the other having lots of noise but smoother motion.
BTW, both the TM700 and SD600 are essentially the same camcorder with minimal differences.
Can anyone explain to me the effect on exposure and motion when it comes to having both frame-rate AND shutter to play with?
I cam from dSLR, here I know that lower shutter in low light give better exposure but also blurs any motion - but what is the effect of framerate on exposure and motion???
Originally Posted by toni1
this is a good technical quastion I was asking myself
Rationally how can you do 1/25 above 25 frames per second (pana 700 can do 50 frames with 1/25) it means that 2 frames will proceed before the shutter closes for 50p (Even so 50 is a multiple of 25 not 60 : it means that in 60p countries the lower shutter speed should be 30 is it so ? this is not dslr specification ?)
Do not confuse shutter speed with frame rate. They are separate things, but related. You can have a sensor that will scan an entire image in only 1/60 of a second, 60 times per second. That scanning shutter speed can be faster, for example only 1/120 of a second but still at 60 frames per second. In that case the sensors will wait 1/60 more between each frame before starting a new scan of the image.
Obviously the shutter speed cannot be lower than the frame rate because of time constraints. That's why a shutter speed of only 1/25 of a second will require the frame rate to drop to only 25 frames per second. The camcorder could still display 50 frames per second however, by showing the same frame twice before moving to the next new one scanned. That's what is called a 2:1 pulldown. And yes in NTSC countries these numbers are indeed 1/30 and 60p. But there are also other types of pulldowns.
In NTSC countries "Digital Cinema" mode, or 24p, the frame rate is 24 fps scanned at 1/24 of a second shutter speed (or 1/48 for sharper motion), but is beeing displayed at 60 frames per second using a 3:2 pulldown method. (see Wikipedia for 3:2 pulldown more detailed explanation)
In PAL countries those numbers are 25p, at 25 fps in 1/25 or 1/50 shutter speeds.
I hope it's not too confusing? Just look up video frames rates in Wikipedia for lots of info on it.
Thanks for help alain
What is disturbing me is this
If 2 frames have to share 1/25 s then each frame will get half of 1/25 duration the result is 1/50 for each frame.
Or maybe frames will just go on independently of shutter speed (like a continius frame) with shutter speed like the main factor of exposition togather with aperture (and gain)
I am realy confused.
Thanks again if you can help me resolve my rational turmoil
I think its better to adjust manual mode to need
I filmed a friends party in a discotec conditions and had more than acceptable results :
In shooting mode I sift to manual mode and go to menue there I select allow low shutter speed and close menue (of course I keep 1080p)
Second I press F (down left of the screen) and I get FOCUS WB SHTR and IRIS
This way I can get the shutter (SHTR) speed down to 1/25 (means more light comming in).
Then I select IRIS ( steps from full open with maximum gain to full open with zero gain to smallest aperture F16)
You have to adjust IRIS using either your vision or included histogramme
Why 1/25 because it will minimise gain ( video noise ) Usualy I had full open with 9 db
In these conditions moving subjects (dancing ) was not a big problem.
I have seen night shots in similar conditions on vimeo and I can tell the result is quiet astonishing even if it it is far from the quality you get in day time ( you cant extract for example one sharp individual frame in 1/25 conditions of moving subjects)
I tried thesesame parameters in a concert in a church , fast panning was a big problem here (in zoom condtions far away from orchestra)
Hope it can help