Sony A7III + hvl-f45rm problem HSS

[djqixo]

Hello

I have problem with HSS and TTL on my Sony A7III + hvl-f45rm.

If I set speed for example 1/2000 I have lines on my photo.

With 1/250 is all OK.

If is e-Front Curtain Shut. = OFF, then I can use for example 1/8000 without lines on photos.

Is it OK? Can I not use e-Front Curtain Shut. = ON with HSS?

Or where is the problem?

Thank you.

[Marino.Manolo]

What is the function of the electronic front curtain shutter?

https://www.sony.co.uk/electronics/support/articles/00018997

Manolo

[djqixo]

So, if I use:

Sony A7III + Sony FE 85mm F1.8 + Sony hvl-f45rm + 1/8000 + F1.8 + flash ON

I must turn OFF e-Front Curtain Shut. 

Do I understand this correctly?

Thanks

Peter

[Marino.Manolo]

Yes, because otherwise the problem of Rolling Shutter presents itself to you.

Manolo