Paul C. Buff, Inc. Technical Forum

Technical Discussion Forum for all Paul C. Buff, Inc. Products

Login

Post a reply
 [ 2 posts ] 

Fri May 19, 2017 3:52 am

Joined: Fri May 19, 2017 3:17 am
Posts: 1

Is there a formula for figuring out the coverage of the various reflectors? For example, the 11" reflectors coverage at 65 ft would be...?




Top Top
Profile
 

#

Fri May 19, 2017 9:15 am

Site Admin
Joined: Tue Dec 08, 2009 10:43 am
Posts: 5266

If you need the actual formula, I can get that for you. If you need a close ball park, you can visit this link: http://www.paulcbuff.com/popups/grids/7_grid_chart.php

This graph shows the beam spread of various grids when installed on a 7" reflector. The 11LTR is 28 degrees, so I would use the 30 degree zone for reference. As the distance doubles, so does the diameter.

Yes, an 11" reflector would have a slightly larger area than the 7", but at 65 feet it is irrelevant (it would be a 4" difference at any distance).

So at 65 feet, you are looking at a 40' spread.

incidentally, at ISO100 and 640Ws, you are looking at f/5.6.




Top Top
Profile
 
Display posts from previous:  Sort by  
Post a reply
 [ 2 posts ] 

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 87 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum