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165-foot Throw w/DVX100
Published : 10th June 2005
Greetings all,
I'm wondering how tight I will end up being able to shoot a subject that will be 165 feet away with the 45mm maxed out on my DVX100. its a speech and I don't have access to the site ahead of time and I’m guessing the subject will be pretty darn tiny - right?
Is there a formula for figuring this sort of thing out? (I’m sure there is and I’m sure you guys will point me to it!)
Thanks,
Brian Young
Flaca Productions
Miami Beach, FL
>is there a formula for figuring this sort of thing out? (I’m sure there is >and I'm sure you guys will point me to it!)
There are some programs to solve this problem at
http://www.cinematography.net/CINEFILE.HTM
If you have a PC or Palm Pilot you're in luck. The Palm programs are the best bet.
Or pick up a copy of Samuelson's "Hands-On Manual for Cinematographers." Page 15-45 would help you out nicely as it contains the following formula :
Object size Distance
------------- = -------------
Image size Lens focal length
Art Adams, DP [film|hdtv|sdtv]
San Francisco Bay Area - "Silicon Valley"
http://www.artadams.net/
Local resources : http://www.artadams.net/localcrew
Brian Young wrote:
>I'm wondering how tight I will end up being able to shoot a subject that >will be 165 feet away with the 45mm mixed out on my DVX100.
Just a guess, but experience tells me you'll need something on the order of 120mm or better.
Wade K. Ramsey, DP
Dept. of Cinema & Video Production
Bob Jones University
Greenville, SC 29614
Brain,
I can't find the exact dimensions of the 1/3" CCD or I could give you an exact answer to your question. But with approximate CCD dimensions of 6.5mm x 4.9mm your image size at 165' with a 45mm lens will be somewhere around 24' x 18'.
Bear in mind this is an approximate figure. If I can find or someone has the exact dimensions for 1/3" CCD’s then I'll refigure and give you an exact answer.
Randy "math is our friend" Miller, DP in LA
>But with approximate CCD dimensions of 6.5mm x 4.9mm your image >size at 165' with a 45mm lens will be somewhere around 24' x 18'.
Randy,
Wow - thanks so much for confirming things.
165 ft. is a pretty good throw for an ENG event - especially with the DVX. but...I bought this camera FOR its short lens and knowing the shortcomings (no pun intended) can't be all things to all people!
Thanks again…
>The Palm programs are the best bet.
According to pCam 17'7" x 13'2" would be the FOV with the 45mm with 1/3" chip maxed out. not ideal to say the least (thanks for the suggestion Art - I actually had this on my palm a while back and ditched it. good to have it back)
Brian Young
Flaca Productions
Miami Beach, FL
So much for approximations.
Glad you got a firm answer.
Randy Miller
>So much for approximations.
That was a darn good guess! They didn't hire me for my math skills!!!
Brian Young
Flaca Productions
Miami Beach, FL
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