who said f2.8 for the zoom lens

Muttondraw said:
Would there be much of an issue upon the use of a B4 lens for 1080p, assuming the lens is only going to be able to use 1080 x 1920 pixels, or are the effects of the mosaic going to be swamped by the anti alias filter again. Would there be a significant resolution advantage in using S16 lenses at 2K instead and then downrezzing to 1920?

Martin
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Technically there is no significant difference in resolution between 2K and 1080P. What you do gain by shooting 2K is 4:4:4 RGB colorspace which will make a difference in CC, Compositing & filmouts.

I don't know if a possible workaround is shooting windowed 2K with a B4 lens and cropping to 1080P while maintaining full color space. RED's chart says no to B4 lenses at 2K but I'm not sure why it wouldn't be possible to crop that to 1080P to maintain 4:4:4 RGB.

You can argue that you have faster, sharper, cheaper cine lenses available for s16 (unless you consider the likes of digiprimes but they're very expensive). Either way, a great new zoom is going to be equally expensive for both formats. On the other hand, you can get older B4 lenses really cheap but they were designed for SD video and might not be optimal. I think it's a draw and depends wether you want ENG/EFP or primes and cine style lenses.
 
advantage of shooting 2k for 1080 is minor.. but a few things help, like having that extra little boom crop area etc.
 
when it shoots 720P, does it use the whole sensor then downres? like using the entire S35mm sized imaging area?
 
Jarred Land said:
advantage of shooting 2k for 1080 is minor.. but a few things help, like having that extra little boom crop area etc.
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Is the aspect ratio for 2K different than 1080? If they're both 16:9, then you don't gain any extra space for boom shots, etc.; you just have a little extra resolution that is helpful when shrinking the footage to 1080 size. Of course, you could probably "window" a 1080 portion from the 2K frame instead - which would end up giving you extra space on both the top/bottom and the sides - but then you'd have to constantly be framing for an image that doesn't take up the entire space of your viewfinder, and that makes precise operation rather difficult.
 
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Graeme_Nattress said:
With RED, 720, 1080p and 2k are all 4:4:4 RGB.
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Oh, great! Are you aware that the format option chart on your website leads one to think otherwise? Lists everything under 2K at 4:2:2.
 
Holga lenses!

haha.


But about the 720P center crop. does that mean a 1280 pixel by 720 pixel, patch inthe middle with the multiplying effect like the Xl1 with 35mm lenses?
 
Yes, the 720p crop is for high speed shooting and does indeed just use the middle of the sensor, giving a focal length magnifying effect, but not of the same order of magnitude as as the x7 that the XL1 gives!

Graeme
 
Graeme_Nattress said:
Yes, the 720p crop is for high speed shooting and does indeed just use the middle of the sensor, giving a focal length magnifying effect, but not of the same order of magnitude as as the x7 that the XL1 gives!

Graeme
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Geez, is the XL1 sensor size really that tiny? i heard it was 0.2 megapixel, but didnt think it would turn a 50mm lens into a 350mm one!
 
Sarmoti said:
Technically there is no significant difference in resolution between 2K and 1080P.
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Especially if you are ultimately going to end up at 1080P anyway. Interesting to note though that the highest resolution you are actually going to be able to "see" through the lens will be less than the pixel number might lead you to expect. The effect being that shooting 2K with an S16 lens and scaling down to 1080P could give you approx 7% greater resolution than shooting 1080P directly with B4. Not a huge amount but I am sure you would be able to see the difference. Of course this does assume you are using good lenses.

Martin
 
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