Trivia - Using a fixed ND filter like a variable ND filter

check the profoto fundamental of lighting series: How to mix flash with ambient light

https://p-v.club/threads/profoto-academy-fundamentals-of-lighting-series.1769/#post-36425

 

If you wanted to shoot at f/2.8 with a three stop ND filter, you'd end up with the following:
1/60s, f/2.8, full power flash.

as your flash is at 1/4 to begin with it'll be under exposed by 1 stop. If you flash has HSS, then that might be the best way forward instead of an ND, although you'll still be missing a top of light.

 

Haha your given scenarios are improving, nd filters and lenses, whats next I wonder

Current Settings: 1/250s @ f/5.6 @ ISO 100 Flash Power 1/4

Scenario: Ideal ambient and flash exposure but want to shoot @ F2.8

Option(s): Attach 3 stopper ND filter the lens/sensor clip
1/250 f2.8 ISO 200 FP 1/4
1/125 f2.8 ISO 100 FP 1/2

Please note the above assumes that the 3 ND filter is actually a 3 stop ND filter, its common to find ND filters to be slightly off their rated stopping power.

I decided to avoid HSS options as I am not sure their power coefficients at different shutter speeds above flash sync speed. I am sure this will change with flash to flash models and manufactures. Also I don't know if the flash power required with HSS as shutter speed increases is linear or non linear. Perhaps someone with more experience can comment on this.

 

Add a 3 stop nd filter bringing the exposure from f5.6 to f2....leaving it a stop under.....so set iso to 50

 

The lens is a Tamron 28-75mm F2.8

 

Maybe I should open up a youtube channel myself Would you like to be my cohost? haha

 

Yep, adding 3 stop of nd filter leads to both ambient and flash exposure being under exposed by 3 stops.
Changing aperture from f5.6 to f2.8 leads to 2 stops increase in flash and ambient exposure, both are still 1 stop underexposed.

To fix this, increase iso by 100 but if you want a cleaner and more dynamic range slow shuttter down by 1 stop and add 1 stop to flash power ofcourse if 1/2 gives you fast enough recycle times and fast enough flash durations.

 

Silly mistake....too many beers.

 

hehe starting the weekend off early there. What are you drinking?

 

a few buds

 

I learnt most of my lighting knowledge from pye jirsa, zack arias, felix kunze, tony corbell, mark wallace.

It was a good exercise. Please post more if anything else comes to mind

 

Stronger than beer

 

I haven't used nd filters with my flash outdoors yet but I recently purchased a pretty inexpensive variable nd and I will give it a go in the near future.

 

Inexpensive variable NDs are usually a bad idea for photographs, good variable nd's are can be viable for videos but tend not to be great for photographs due to 2 layers of glass. This usually reduces image quality significantly, especially for photography since more detailed resolution is needed for photographs compared to videos.