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The right ND filter

redserv

Well-Known Member
Joined
Oct 22, 2017
Messages
162
Likes
33
Age
46
#1
Hi guys, I have been using the polar pro ND filters (6 pack) with my MPP since I started flying. Because I live in the Caribbean islands and most of the time it's sumny, I use the ND32 almost evertime I fly. However I am beginning to think that the rest the ND filters that came in the set is a waste. Is their some type of calculation I can use to determine what filter I use to bring my EV to almost zero? The set also came with polarized filters which I am not sure when I should use it. I will appreciate
f someone can point me in the right direction.

These are the filters I use:
6-Pack | Cinema Series | Mavic Pro/Platinum

Some of my work so far
Trini Weekes
 

dirkclod

Moderator
Staff member
Joined
Oct 12, 2016
Messages
7,369
Likes
4,167
Age
63
Location
Amory , MS
#2
Seems like I have seen where they have a guide or video on it and will look if no one post it for you.


// I see they have an app that you might look into or look on their site .
PolarPro Mobile App
 

Goof

Well-Known Member
Joined
Sep 8, 2018
Messages
184
Likes
80
Location
Remote Australia
#3
You can often go for a test flight without the ND to get a feel for the current lighting, see what settings the drone is comfortable at and work from there.

Say you go for a flight and find that even at f/11, you can't get the shutter speed where you want it and it's still too fast at 1/500" or something like that.
To get from f/11 to f/4 (sharpest aperture for many people) we need 3 stops less light (f/11 -> f/8 -> f/5.6 -> f/4).
To get from 1/500" to 1/60" (assuming you want it in the 30fps "180 degree rule"), you need 3 stops less light again (1/500" -> 1/250" -> 1/120" -> 1/60").
In total we need to block 6 stops of light. Raise 2 to the 6th power to get 64, in this case we need an ND64 filter.

Note that clouds, heavy glare, whether or not you're sitting on a 1/3rd EV instead of neatly on the boundaries etc will skew results a bit. This technique plus a bit of practice / experience with the conditions usually gets you in the ballpark though.