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Slog not working on zoom?

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Caprice View Drop Down
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Post Options Post Options   Quote Caprice Quote  Post ReplyReply Direct Link To This Post Topic: Slog not working on zoom?
    Posted: 15 April 2019 at 08:44
Hi,

When filming, I like to shoot Slog and have done for a while now.

recently, I thought I'd film with my my 70-200 A mount zoom on my a7Rii with a converter and found, while the live view was showing Slog, as soon as I hit record, the footage darkened like it couldn't film Slog with that configuration.
Does anyone know why this is?
Cheers!
 



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addy landzaat View Drop Down
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 15 April 2019 at 09:43
What do you mean by converter? Like a 1.4 or 2.0 converter? Or do you mean an adapter?

What adapter did you use?

What was the F-stop?

A mount lenses are wide open for focusing, so, maybe, what you're seeing is the lens stopping down?
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Caprice View Drop Down
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Post Options Post Options   Quote Caprice Quote  Post ReplyReply Direct Link To This Post Posted: 15 April 2019 at 09:54
Sorry, adapter.
I have a Sony LA-EA4 A-Mount to E-Mount Lens Adapter.

From memory, the F-stop around the open end for narrow DOF. I was shooting at 50fps so I had the shutter set at 1/100th.

The footage I got was the same as what I was seeing. I was hoping it was just the live view but no luck. The footage still came up ok in edit. I just to make different edits compared to the Slog footage from the E mount wide angle that I normally use. I sometimes use an E mount 35 ml and the footage matches the wide angle in brightness.
I haven't come across this problem before.
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Miranda F View Drop Down
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 16 April 2019 at 11:41
Originally posted by Caprice Caprice wrote:

Hi,

When filming, I like to shoot Slog and have done for a while now.


What is slog?
Miranda F & Sensorex, Sony A58, Nex-6, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras . . .
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pegelli View Drop Down
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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 16 April 2019 at 11:50
This is S-log!

Originally posted by Sony Sony wrote:

What is S-Log?

S-Log is a log curve which has been specially optimised for digital motion picture cameras to maximise the performance of the image sensor.

Cinematographers shooting in the current REC.709 standard have to choose whether to sacrifice detail in the highlights or the shadows. S-Log allows you to retain all of this information.

The advantage of S-Log is far greater control over the final image than material shot natively in REC.709. S-Log gives you the freedom to create dazzling pictures which retain as much of the relevant image information as possible, despite the limitations of the display technology.


Mind the bandwidth of others, don't link pictures larger then 1024 wide or 960 pix high, see here
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stiuskr View Drop Down
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Post Options Post Options   Quote stiuskr Quote  Post ReplyReply Direct Link To This Post Posted: 16 April 2019 at 17:33
Originally posted by Caprice Caprice wrote:

Hi,

When filming, I like to shoot Slog and have done for a while now.

recently, I thought I'd film with my my 70-200 A mount zoom on my a7Rii with a converter and found, while the live view was showing Slog, as soon as I hit record, the footage darkened like it couldn't film Slog with that configuration.
Does anyone know why this is?
Cheers!


Gary Friedman does and covers it very well in his e-book for the camera. I had a quick browse through his a7RIII book and couldn't come up with anything for your issue but it was a quick browse using the keyword search and might have missed it in the notes.

https://www.friedmanarchives.com/sony-alpha-a7r-ii/
Rob Suits Jr.
a99M2 a99 a77 a700 KM7D|Min24/2.8 Min35/2 So50/1.4 So50/2.8 Min85/1.4G Tam90/2.8 Tam180/3.5|Tam17-50 CZ24-70G2 KM28-75D So70-200G1 So70-300G So70-400G1| SonyF60 AD200R2
 



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Caprice View Drop Down
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Post Options Post Options   Quote Caprice Quote  Post ReplyReply Direct Link To This Post Posted: 20 April 2019 at 08:21
Thanks for the information, I'll check out Gary's info.
I might have another play with the set up too, to see if there was something else going on that I wasn't aware of.
Cheers!
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