[Original post: 27may21. 28may21 edits highlighted in
blue]
Ciao,
last week I grabbed a 5D3 (so now flanking my old 70D) from eBay and started playing with Danne's beautiful presets (using 1apr21 build).
I'm reporting my findings and understandings in the table below, and I would be glad to know if there is something wrong / misreported or if someone is having a different experience.
Please note that
- I'm not considering 3x3 modes as I'm personally not interested in using them.
- FOV values are reported for 16mm and 35mm glass, just because these are two of the lenses I think I will use most. However, they may even be used as a reference here.
- I did not include FULLRES_LV mode (Full-res LiveView) as it simply won't work for me. It gave me 1 single frame once, then now keeps issuing a 'Raw detect error' [turns out that it works only with audio off and Global Draw off, h/t Bender@arsch].
- Results refer to 'out of the box' presets, namely with untouched aspect ratio and 14-bit recording. See last column for remarks on obtaining continuous recording @lower bit depth, where necessary.
So here we go:
| ID | Description | Horizontal resolution* | H/V ratio | Binning | FOV@16mm | FOV@35mm | APS-C safe** | Frame rate | Data rate | Cont.Rec. | Preview | Other notes |
| 3X | 1920 1:1 | 1.9K (HD) | 2.39 | 1x1 | 41° | 19° | Yes | 25 | 48 MB/s | Yes | colors, slightly low h/v ratio?, hi fps | Perfectly centered? |
| anamorph_ fullres | anamorphic fullres | 1.9K stretched to 5.6K | 2.39 | 1x3 | 97° | 54° | No | 15 | 69 MB/s | Yes | colors, correct framing, low fps | Covers 100% of sensor width. Centering not investigated. |
| 4K_HFPS | 4K 1:1 half-fps | 4K | 2.39 | 1x1 | 77° | 40° | Almost | 12.5 | 72 MB/s | Yes | colors, correct framing, low fps | A bit below center. Unusable: produces pink / magenta / corrupted frames. |
| 1x3 | anamorphic | 1.8K stretched to 5.3K | 2.39 | 1x3 | 93° | 52° | No | 24/1.001 | 120 MB/s | Yes | grey scale, correct framing, low fps | Covers 94% of sensor width. Just slightly below center? |
| 3K | 3K 1:1 | 3K | 2.39 | 1x1 | 62° | 31° | Yes | 25 | 125 MB/s | Yes | colors, correct framing, low fps. | A bit above center and slightly on the left? |
| 33K | 3.3K 1:1 x5 | 3.2K | 2.39 | 1x1 | 65° | 33° | Yes | 24/1.001 | 129 MB/s | Yes | colors, correct framing, low fps | A bit below center and slightly on the right? |
| CENTER_Z | 3.5K 1:1 centered x5 | 3.5K | 2.39 | 1x1 | 70° | 35° | Yes | 25 | 179 MB/s | No | colors, correct framing, low fps | Slightly above center? Continuous recording @10 bit (in some circumstances even 12) or disabling Global Draw + 12 bit (in this case preview will be standard x5, so cropped). |
| UHD | UHD 1:1 | 3.8K | 2.61 | 1x1 | 74° | 38° | Almost | 25 | 183 MB/s | No | colors, correct framing, low fps | Perfectly centered? Continuous recording @10 bit (apart from extreme circumstances maybe?), or in some circumstances 12 bit but disabling Global Draw (no preview at all!) |
* 1K = 1.024 px
** meaning that you can shoot with an APS-C lens without suffering vignetting
For my tests I have been using
- SD: SanDisk Extreme PRO 95 MB/s 128GB
- CF: Lexar 1066x 160 MB/s 64GB
with both SD overclock (@160 MHz) and card spanning enabled.
Card benchmarks (in video mode) give me
- 57 MB/s write speed for SD alone
- 42 (SD) + 53 (CF) MB/s with simultaneous write test
but while the former test is in line with what I obtain on my 70D with 160 MHz overclock, I think that the latter is not reliable as it would not explain how ever I was able to shoot continuously in
3K mode at 129 MB/s (measured ex post)
[Bender@arsch confirms that the latter is not reliable].
Final remark: on my 70D, thanks to the work of ArcziPL (and others), and using his 1mar21 build, I am able to push SD overclock also to 192 and 240 MHz. With 240 MHz, benchmarks display an improvement from 57 to 76 MB/s for SD write speed. Not that much, but I'm wondering if that could help in achieving continuous shooting with
CENTER_Z or
UHD.
Oh, and why
4K_HFPS mode seems to require only 72 MB/s @12.5 fps? If I double that, I get only 144 MB/s, which is way lower than what I measure (179 MB/s) with an even lower resolution (3.5K with
CENTER_Z) @25 fps... mmh.
Thank you!
Sergio
