Which flash to use?

Started 3 months ago | Discussions thread
NickZ2016 Senior Member • Posts: 2,308
Re: Which flash to use?
1

brandon77 wrote:

brandon77 wrote:

NickZ2016 wrote:

brandon77 wrote:

I have just bought myself a pretty cheap Vivitar283 flash which is very good, However with the settings it also takes me 9-12 metres away from my subject, shooting at 5.6-8 at a rating of 320 on portra 400.

A

GN is 20 metres. 10 metres away means F/2 at 100. Or F/4 at 400 but you're at 320.

That's straight on. No bounce. No diffuser or filter over the flash.

Unless I got the math wrong . But even if I did the 283 is not a hugely powerful flash that you'd expect F/8. Maybe if you had a Metz 45

I have seen the Metz 45. Do you own or have you used this flash?

I've had a couple of Metz 45 over the years. Mostly used in TTL mode. The Metz 45 is a couple of levels above the Vivitar (at least) but if you aren't using TTL or auto mode figuring out exposure is just math. GN divided by distance equal F/stop.

https://en.wikipedia.org/wiki/Guide_number

"Guide number = f-number × distance"

Just use the GN in metres if you think in metres . The higher feet number is only if you're measuring in feet.

You need to think about bounce. Bouncing off a high ceiling lowers output a lot.  The diffuser you're using. A wide angle diffuser lowers the GN.

 NickZ2016's gear list:NickZ2016's gear list
Nikon D800 Nikon AF-S Nikkor 50mm F1.4G Nikon AF Nikkor 35mm f/2D Nikon AF-S Nikkor 50mm F1.8G Nikon 85mm F1.8G +4 more
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow