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Interceptor121

Member Since 25 Jun 2011
Offline Last Active Today, 01:30 PM
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Posts I've Made

In Topic: ISO, Native ISO, and exposure range in the highlights & shadows

Today, 01:19 AM

This is a good video to explain how the dual ISO sensors work. This is what is used by the GH5s and the BMPCC.
As far as the GH5 is concerned you have a standard system for MFT with single circuit
I think people are still confused on why on log iso starts at 400 and normally is 200 and this is due to the compression of the gamma curve

In Topic: Nauticam CMC-2 Any real life experience?

Today, 01:08 AM

Haven't tried it, but I was under the impression that the CMC-2 provides greater magnification (and thus less working distance) than the CMC-1?
 
I personally also use the UCL-165. Partially because I bought it ages ago, and partially because any higher magnification is useless when hand-holding with the 14-42mm lens. At least for video. Maybe a different story when shooting from a tripod, but I also have the Panasonic 45mm macro and Olympus 60mm macro lenses, which I feel are a much better solution for real macro (and super-macro) work than the 14-42 + diopeter route. So why bother with the CMC-2? What hole does it fill? 


I am looking for an alternative to the UCL-165 possibly with better optical quality. I entirely agree with your point that stronger diopter are useless moreover once you activate ex tele you have additional 1.4x crop.
I personally do not like underwater videos shot at fixed focal length with a sequence of small critters so although I have the oly 60mm I never use it for video.
I would like to have something that works within 15-20 cm working distance that doesnt have the fringing of the Inon lens

In Topic: Panasonic GH5 Dual IS and Leica 12-60mm test

Yesterday, 03:40 AM

I ve watched it on macbook pro i ll watch it again on tv and let you know

If you use Safari it will limit to HD so the bitrate will be low. On chrome or firefox it will use the full vp9 codec however I can tell you it has banding in that sequence no matter what as there is a lot of water and the encoding crushes it

 

I have uploaded at 40 mbps you can push it to 45 before it goes beyond recommendation but frankly I do not think that is the issue the problem is H264 the file I have created for my personal use on HEVC is 18 mbps and it looks much better

 

H264 for 4K is not good period and the one youtube uses VP9 is crap too


In Topic: Panasonic GH5 Dual IS and Leica 12-60mm test

Yesterday, 02:45 AM

I have checked the files. The source files do not have it the ones I use at home do not have it either (HEVC)

For youtube I have used YouTube recommended upload settings 

 

Video

ID                                       : 1

Format                                   : AVC

Format/Info                              : Advanced Video Codec

Format profile                           : High@L5.2

Format settings                          : CABAC / 2 Ref Frames

Format settings, CABAC                   : Yes

Format settings, ReFrames                : 2 frames

Codec ID                                 : avc1

Codec ID/Info                            : Advanced Video Coding

Duration                                 : 4 min 11 s

Bit rate                                 : 40.0 Mb/s

Width                                    : 3 840 pixels

Height                                   : 2 160 pixels

Display aspect ratio                     : 16:9

Frame rate mode                          : Variable

Frame rate                               : 23.976 (24000/1001) FPS

Minimum frame rate                       : 23.974 FPS

Maximum frame rate                       : 23.981 FPS

Color space                              : YUV

Chroma subsampling                       : 4:2:0

Bit depth                                : 8 bits

Scan type                                : Progressive

Bits/(Pixel*Frame)                       : 0.201

Stream size                              : 1.17 GiB (99%)

Writing library                          : x264 core 155 r2901 7d0ff22

Encoding settings                        : cabac=1 / ref=1 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=18 / lookahead_threads=3 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=2 / b_pyramid=0 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=30 / keyint_min=15 / scenecut=40 / intra_refresh=0 / rc_lookahead=30 / rc=2pass / mbtree=1 / bitrate=40000 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / vbv_maxrate=300000 / vbv_bufsize=300000 / nal_hrd=none / filler=0 / ip_ratio=1.40 / aq=1:1.00

Encoded date                             : UTC 2018-11-11 09:48:15

Tagged date                              : UTC 2018-11-11 09:48:15

Color range                              : Limited

Color primaries                          : BT.709

Transfer characteristics                 : BT.709

Matrix coefficients                      : BT.709

And those produce tiny banding in the video for few seconds around 55" elapsed however in youtube almost the whole part of the turtle going up has got banding introduce by their compression

 

If I try to upload the prores version that is 12 GB and it will take a long time...youtube tells me the video is not optimised for upload and that it will take forever...!

 

I believe the only possible way to completely eliminate the issue is to make it HDR conformant so that it takes 10 bit colour however I have decided to work in Cinelike D as I am not able to grade properly HDR

 

This kind of clip probably would have been a good candidate for HDR considering the dynamic range and colour however in practical terms when I watch this in 8 bits HEVC it looks already great


In Topic: Panasonic GH5 Dual IS and Leica 12-60mm test

Yesterday, 12:37 AM

@dave the focal lengths over 35 are extremely useful I believe the 12-35 is too short
@lion2fish I shot in all intra 400 mbps 10bits and I have no banding of any sort in any of the clips however youtube converts what you upload and also renders in variable manner
Where do you see it most? I noticed the part where the turtle swims up which in my original files is fine...