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[Pursuit photography] Camera focal length (and frame format)
Posted: 28 Jun 2017, 10:42
by Lim
Hey
Just wanted to ask if I can improve my ufotest pictures with a new camera lense. The "problem" I have (especially with TN panels) with my 12mm samyang t2.2 lense on a micro four third sensor, is that I have to go pretty close to the monitor and viewing angles "destroys" my taken picture a bit. My thoughts: with a ~30mm lense I can make 1-2 steps back from the monitor where the pictures will not suffer (maybe?) that much within viewing angles. I also tried already with filming in 4k, slow down in premiere and pick the frame where the pursuit camera line is perfectly straight. The problem here also was within viewing angles and my picture was not that sharp and chiefs example on a perfect picture
Thanks a lot
Re: Camera focal length (and frame format)
Posted: 28 Jun 2017, 15:03
by Chief Blur Buster
Lim wrote:Hey
Just wanted to ask if I can improve my ufotest pictures with a new camera lense. The "problem" I have (especially with TN panels) with my 12mm samyang t2.2 lense on a micro four third sensor, is that I have to go pretty close to the monitor and viewing angles "destroys" my taken picture a bit. My thoughts: with a ~30mm lense I can make 1-2 steps back from the monitor where the pictures will not suffer (maybe?) that much within viewing angles. I also tried already with filming in 4k, slow down in premiere and pick the frame where the pursuit camera line is perfectly straight. The problem here also was within viewing angles and my picture was not that sharp and chiefs example on a perfect picture
Thanks a lot
Hey,
Are you
Lim's Cave? I haven't yet added you to
http://www.blurbusters.com/motion-tests ... uit-camera
Yes, the solution is to add distance between the monitor and the lens -- use a narrow-angle lens for pursuit camera photographs in TestUFO. You can also use zoom as a way to compensate for distance, too.
The ideal distance is not too much closer than regular human view distance (~1:1 screen width) but some testers do it really close (inches away) and some from very far away (over a meter away). Either way works but for most accurate
pursuit camera photography is from human viewing distance.
Re: Camera focal length (and frame format)
Posted: 28 Jun 2017, 15:15
by Lim
Hey again,
thanks for your response. Yes I'm from the YouTube channel Lim's Cave
Good to know that a longer focal lenght can help. I think I'll try to get a cheap ~24-35mm lense from E-Bay then, because like mentioned, on TN panels with my wide angle lense it's pretty exhausting to get a "perfect" result.
No rush
Since I'm working at this "project" I really know how much work this is to keep everything up to date
Edit: I also will add some Blur-Busters Links onto my page as soon as possible
Re: Camera focal length (and frame format)
Posted: 30 Jun 2017, 13:30
by Chief Blur Buster
Yes,
Even 8 inches or 12 inches -- if you're just capturing one UFO in
www.testufo.com/ghosting -- is often far away enough to eliminate gamma nonuniformities in pursuit camera photography. Zoom or crop will also do the job. Back away a bit, and use zoom or cropping.
[Pursuit photography] Camera focal length (and frame format)
Posted: 17 Jul 2017, 09:08
by Chief Blur Buster
Ghosting now supports vertical repositioning via dragging in Full Screen Mode. There's a new Full Screen button at
http://www.testufo.com/ghosting
This is good since ideal position for pursuit photography is exact screen center.
But sometimes not all pursuit rails can easily be raised to be exactly screen center.
So you can adjust Ghosting up/down by a few centimeters to match your camera's vertical position. Just don't get too close to top edge or bottom edge, since there is often major stobe crosstalk differences (in ULMB) at top/bottom edges versus screen center.