Thread: Aputure 300d (2K HMI equivalent)

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  1. #11  
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    Aaron, you just took my little toe dip into numbers and crushed my feebleness with a tour de force math smackdown. I bow before you in admiration.

    On a side note- I have the Aputure fresnel attachment and if I recall correctly it gives roughly a 3-4x boost (depending on be angle) to my 120d.
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  2. #12  
    Senior Member LochnessDigital's Avatar
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    Quote Originally Posted by keithlango View Post
    Aaron, you just took my little toe dip into numbers and crushed my feebleness with a tour de force math smackdown. I bow before you in admiration.
    Oh, hush.

    I actually set up a spreadsheet this kind of stuff. Took a little bit of effort to brush back up on trigonometry, but once that all came rushing back, I got it all figured out and it's as easy as plugging in the provided numbers.

    I'm really excited about this Aputure light, actually. I wonder if Aputure could get a Source 4 tube to mount on this thing. I'd love to be able to get those cool theatrical shafts of light, Indiana Jones style.

    There's also one really big caveat to my calculations above. Perhaps when Ted said 82,000 lux, he meant with 60 degree the reflector on which would certainly change things...
    Aaron Lochert
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  3. #13  
    Listen to the beginning of this video: https://m.youtube.com/watch?v=iR2zR1GDjTI

    I know the filter thing seems like a new idea, but gels already exist. I'm trying to figure out how does that improve the "CRI"? It's easy to hit these numbers for good cri, but that doesn't account for spikes. Is it really improving the light or just correcting an already green light? This goes back to my previous post concerning Aputure's rollouts at times. It just doesn't make sense.
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  4. #14  
    Senior Member LochnessDigital's Avatar
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    Anticipating that Ted meant 82K lux with the 60 degree reflector, here's those calculations. I also went back to the Arri photometrics calculator and it's saying the 2K open face is 53 degrees, not 60.

    Aputure 300d (assuming 60 deg angle) :

    Intensity: 7,618 fc, 82,000 lx
    Output: 21,468 lumens
    Beam Angle: 60 deg
    Distance: 1.64', 0.5m
    Beam Diameter: 1.9', 0.58m

    Distance needed to fill a 4x4" frame: 3.46', 1.05m
    Intensity hitting frame at that distance: 1708 fc, 18,388 lx

    Aputure 300d (assuming 120 deg angle) :

    Intensity: 7,618 fc, 82,000 lx
    Output: 193,208 lumens
    Beam Angle: 120 deg
    Distance: 1.64', 0.5m
    Beam Diameter: 5.68', 1.73m

    Distance needed to fill a 4x4" frame: 1.15', 0.35m
    Intensity hitting frame at that distance: 15,375 fc, 165,495 lux

    ARRI Arrilite2000 Plus open face:

    Intensity: 10219 fc, 110000 lx
    Output: 21476 lumens
    Beam Angle: 53 deg
    Distance: 1.64', 0.5m
    Beam Diameter: 1.64', 0.50m

    Distance needed to fill a 4x4" frame: 4.01', 1.22m
    Intensity hitting frame at that distance: 1709 fc, 18396 lx

    K5600 Joker Bug 800 with super wide lens:

    Intensity: 7,300 fc, 78577 lx
    Output: 33024 lumens
    Beam Angle: 43.6 deg
    Distance: 3', 0.9m
    Beam Diameter: 2.4', 0.73m

    Distance needed to fill a 4x4" frame: 5', 1.5m
    Intensity hitting frame at that distance: 2628 fc, 28288 lx

    So if Ted from Aputure meant 82K lux at 60 degrees, then it's almost exactly like a 2K tungsten, check out the "distance needed to fill a 4x4' frame" section. Damn near identical.

    I'm managing my expectations and throwing out the comparison to the Joker 800 comment until proven otherwise.
    Aaron Lochert
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  5. #15  
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    Quote Originally Posted by LochnessDigital View Post
    Anticipating that Ted meant 82K lux with the 60 degree reflector, here's those calculations. I also went back to the Arri photometrics calculator and it's saying the 2K open face is 53 degrees, not 60.

    Aputure 300d (assuming 60 deg angle) :

    Intensity: 7,618 fc, 82,000 lx
    Output: 21,468 lumens
    Beam Angle: 60 deg
    Distance: 1.64', 0.5m
    Beam Diameter: 1.9', 0.58m

    Distance needed to fill a 4x4" frame: 3.46', 1.05m
    Intensity hitting frame at that distance: 1708 fc, 18,388 lx

    Aputure 300d (assuming 120 deg angle) :

    Intensity: 7,618 fc, 82,000 lx
    Output: 193,208 lumens
    Beam Angle: 120 deg
    Distance: 1.64', 0.5m
    Beam Diameter: 5.68', 1.73m

    Distance needed to fill a 4x4" frame: 1.15', 0.35m
    Intensity hitting frame at that distance: 15,375 fc, 165,495 lux

    ARRI Arrilite2000 Plus open face:

    Intensity: 10219 fc, 110000 lx
    Output: 21476 lumens
    Beam Angle: 53 deg
    Distance: 1.64', 0.5m
    Beam Diameter: 1.64', 0.50m

    Distance needed to fill a 4x4" frame: 4.01', 1.22m
    Intensity hitting frame at that distance: 1709 fc, 18396 lx

    K5600 Joker Bug 800 with super wide lens:

    Intensity: 7,300 fc, 78577 lx
    Output: 33024 lumens
    Beam Angle: 43.6 deg
    Distance: 3', 0.9m
    Beam Diameter: 2.4', 0.73m

    Distance needed to fill a 4x4" frame: 5', 1.5m
    Intensity hitting frame at that distance: 2628 fc, 28288 lx

    So if Ted from Aputure meant 82K lux at 60 degrees, then it's almost exactly like a 2K tungsten, check out the "distance needed to fill a 4x4' frame" section. Damn near identical.

    I'm managing my expectations and throwing out the comparison to the Joker 800 comment until proven otherwise.
    This is interesting! hmmm
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  6. #16  
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    Okidoke, I dug my 120d out and set up some quick measurements with my light meter.

    At 100% and at a distance of 0.5 meters (or 19.7 inches- which is a ridiculous measuring distance, really)...
    • 120 degreees, no reflector-- 1800 fc / 19375 lx
    • with included 60 degree reflector -- 2700 fc / 29062 lx
    • with Aputure Fresnel attachment at 42 degrees -- 3800 fc / 40902 lx
    • with Aputure Fresnel attachment at 12 degrees -- 9000 fc / 96875 lx



    At 100% and at more realistic "real world" distance of 3 meters (9 feet, 10 inches):
    • 120 degreees, no reflector-- 42 fc / 452 lx
    • with included 60 degree reflector -- 52 fc / 560 lx
    • with Aputure Fresnel attachment at 42 degrees -- 170 fc / 1830 lx
    • with Aputure Fresnel attchment at 12 degrees -- 320 fc / 3444 lx


    To get an exposure of f4 at ISO 400 and a 180 degree shutter you need 50 foot candles or 538 lux. If you shoot ISO 800 then you need 25 fc or 269 lx. Adjust for diffusion accordingly (I usually cut the light output in half when I throw my Strobe Pro 3x4 softbox on these).

    The reflector helps boost the foot candle readings a bit, which is kinda nice. But, man- that little fresnel unit they have is mighty handy for pumping up the oomph. Assuming the 300d will be affected roughly the same we can expect to see that 300d yield a 3.27x boost over the reflector using the fresnel at 42 degrees, and a tasty 6x boost over the reflector when in full 12 degree spot. My (admittedly rusty) inverse square math tells me that theoretically you could spot in a 300d with the fresnel from 40+ feet away and still get an f4 exposure at ISO 400. But I'd need Aaron to check my homework.

    It's not as beefy as a Joker or even a 575w HMI, but it's not hot garbage, either.
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  7. #17  
    Senior Member LochnessDigital's Avatar
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    Quote Originally Posted by keithlango View Post
    120 degreees, no reflector-- 1800 fc / 19375 lx
    Wait, really? You're getting 19K lux with no reflector?

    Check this out: http://www.aputure.com/en/fresnel.html They say 14K at the 42 degree spread and 67K at 18 degrees.

    Not only are you getting more than that on the wide end with no reflector or fresnel attachment, you are absolutely kicking the crap out of that spec when you have the fresnel on.
    Aaron Lochert
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  8. #18  
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    Quote Originally Posted by LochnessDigital View Post
    Wait, really? You're getting 19K lux with no reflector?

    Check this out: http://www.aputure.com/en/fresnel.html They say 14K at the 42 degree spread and 67K at 18 degrees.

    Not only are you getting more than that on the wide end with no reflector or fresnel attachment, you are absolutely kicking the crap out of that spec when you have the fresnel on.
    Well, last night when I checked my Sekonic said 1800 fc. I didn't check the Sekonic's lux reading, I just used an online fc/lx converter to get the 19k. (I usually use foot candles for my work- easier for my brain to wrap around for some reason- I think it's the simplicity of getting f4 with 100/50/25/12 for ISO 200/400/800/1600).

    Anyhow, based on your level of surprise, I just decided to double check and today the Sekonic said 1400 fc from 19.6 inches away. For funzees I checked it in lux as well and the Sekonic said 17,000 lux. This is all 100%, no reflector, 0.5m distance from the chip. I guess my light meter was just trolling me with that 1800 fc read last night.
    I didn't bother re-checking the fresnel, but I can if folks find it interesting.

    20170426_121718.jpg

    20170426_121723.jpg

    20170426_121835.jpg
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  9. #19  
    Senior Member LochnessDigital's Avatar
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    Well either way, that's good news. 17K at 120 degrees is still substantially more light than their advertised 14K at 42 degrees.

    Edit:

    And now Ted is saying "about a 2K with the fresnel on it," as well as "82,000 lux at 1.5m away" but also has the fresnel attachment on at that moment he's saying it, so I don't know what to assume anymore. Maybe I'll hold off on all this math until it gets figured out.


    https://vimeo.com/214711826

    Edit 2:

    And now 31,000 lux at 1m, which calculates to 124,000 lux at 0.5 meter... This is getting ridiculous.
    https://www.cinema5d.com/aputure-lig...d-compete-sun/
    Last edited by LochnessDigital; 04-27-2017 at 08:11 PM.
    Aaron Lochert
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  10. #20  
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    LOL... specs on this thing are a "number salad" right now. You want numbers? We got numbers. All the best numbers. Here, we even have these other numbers. Oh look, I just found a box full of more numbers. ha

    If the price is below $1k I'll hop on one and test it with my meter. Only then will I know what it does. heh
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