joe1946

"The capacity for shooting 4K differs slightly on each of the two cameras, as the more professionally styled RX10 II can shoot 4K video at extended lengths (up to 29 minutes in the US), while the more casual, pocket-friendly RX100 IV can shoot 4K clips at up to about 5 minutes in length. Additional professional caliber video features on both of the new cameras include Picture Profile, S-Log2/S-Gamut, and more. " http://www.sony.com/en_us/SCA/company-news/press-releases/sony-electronics/2015/sonys-rx100-iv-and-rx10-ii-cameras-bring-professio.html Sony USA 29 minutes for the RX10 II in 4K.

After using the GH4 and NX1 I have no desire for a DSLR with OVF for shooting 4K video.

I boot Yosemite off an internal 1TB SSD in a Sonnet Tempo 6Gb/s SATA PCI Express 2.5" Solid State Drive Card in my old 2008 Mac Pro. I also have the new 6 core Mac Pro with LaCie 1TB Little Big Disk Thunderbolt-2 Solid State Drive .

Is that with the old 3840x2160 UHD sensor from the BMC 4K Production camera ? You would think it had DCI cinema 4K (4096x2160) like other 4K cinema cameras and the 4K GH4.

Will the 4K A7s cost $2K or $4K ? The 4K AX100 cost $2K.

AX1 bit-rate specs :

Philip Bloom on Twitter :

I would be satisfied with XAVC-S 4K at 60fps and 150Mbps bit-rate like the AX1. The new Sandisk UHS-II cards would handle that without a problem.

The Sony FDR-AX1 does 4K @ 60fps using XAVC-S at 150Mbps and the AX100 4K at 30fps at 60Mbps.

I bet it will have the same 4K specs as the Sony 4K AX100 with 60MB/s XAVC S 4K @ 24 and 30 fps on SD cards with exFAT file system.

Low light performance with a 12mp full frame sensor should be off the charts IMHO !

Compare it to the full frame Canon EOS 1D C that has a 1.3x crop in 4K.

The Sandisk Extreme Pro 95MB/s card is a class 10 card meaning minimum 10MB/s compared to 30MB/s minimum for the speed class 3 cards. https://www.sdcard.org/consumers/speed/speed_class/ http://www.sandisk.com/products/memory-cards/sd/

I pre-ordered from B&H. BTW the GH4 supports UHS-1 Class 3 SD cards and the best deal I have seen is for the Kingston Digital Kingston Digital 64GB SDHC UHS-I Speed Class 3 Flash Card (SDA3/64GB ) at Amazon for $109.70. http://www.amazon.com/gp/product/B00I3BQJNA/ref=s9_simh_gw_p421_d0_i2?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=center-2&pf_rd_r=0NT042C2FTD7Q2D5208F&pf_rd_t=101&pf_rd_p=1688200382&pf_rd_i=507846

That should be effectively a 20-200mm f4.8 .