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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Hyperfocal Distance chart for Dragon sensor.

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Ted Parkes

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Has anyone worked out the Hyperfocal distances for the Dragon sensor, 6K. Since the other resolutions are cropped from the 6K full frame then the same calculations should apply. The number I am missing to do it myself is the circle of confusion value.
 
To me hyperfocal distances are quite difficult to define in this digital age. Screen size mastering resolutions lenses and everything else makes it a difficult thing to make a precise and valid chart for. But if you really want one then I would follow the super 35mm chart for theatrical release.

Any app like this one works if you choose a sensor size close to dragon.

https://itunes.apple.com/us/app/dofmaster/id300820570?mt=8
 
Ted Parkes said:
Thanks Bjorn .. That is what I have been doing in any situation that I felt call for it but was curious to know if anyone had managed to work out the numbers closer to reality for the full 6K dragon sensor. I did find these carts for APS-C and Full Frame Sensors . Dragon falls somewhere in-between these.

http://media.digitalcameraworld.com...3/2013/02/Hyperfocal_distance_cheat_sheet.jpg
Click to expand...

True but Hyperfocal distance is also related to the mastering format. So if you got lets say APS-C chart then thats... most possibly good for theater and Full frame charts might fit TV screen viewings... Then you can add resolution into the mix and say that a 4k screen needs a narrower chart and a standard Def screen can use a really wide chart. So it's a difficult thing to put a stamp on. I guess an app where you plot in all the parameters could help.
 
Ted Parkes said:
Thanks Bjorn .. That is what I have been doing in any situation that I felt call for it but was curious to know if anyone had managed to work out the numbers closer to reality for the full 6K dragon sensor. I did find these carts for APS-C and Full Frame Sensors . Dragon falls somewhere in-between these.

http://media.digitalcameraworld.com...3/2013/02/Hyperfocal_distance_cheat_sheet.jpg
Click to expand...

True but Hyperfocal distance is also related to the mastering format. So if you got lets say APS-C chart then thats... most possibly good for theater and Full frame charts might fit TV screen viewings... Then you can add resolution into the mix and say that a 4k screen needs a narrower chart and a standard Def screen can use a really wide chart. So it's a difficult thing to put a stamp on. I guess an app where you plot in all the parameters would help but if you only want to derevate from dragon, lens,fstop focus distance you get focus depth and hyper focus out of the pCam app it has dragon 6k as a template see screen dump.
 

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At the risk of sounding ignorant, may I ask what the advantage is to calculating hyperfocal distances prior to the shoot? What's the disadvantage to doing it on the day, with the specific lens and sensor crop you've decided to use? Like even if you calculated it out for 6k, wouldn't it change if, for example, you ended up having to crop to 5.5k (6KHD) for specific lens coverage? Or are you using it to get a ballpark so that you're not going completely from scratch on set?

Regardless, I should probably invest in pCam.
 
Mike P. said:
At the risk of sounding ignorant, may I ask what the advantage is to calculating hyperfocal distances prior to the shoot? What's the disadvantage to doing it on the day, with the specific lens and sensor crop you've decided to use? Like even if you calculated it out for 6k, wouldn't it change if, for example, you ended up having to crop to 5.5k (6KHD) for specific lens coverage? Or are you using it to get a ballpark so that you're not going completely from scratch on set?

Regardless, I should probably invest in pCam.
Click to expand...

No, the sensor size is not that important but its allways nice to know what the lowest focus distance you can have and from there be sharp to infininity on a given lens and Fstop. But the 6k to 5.5k difference will not make much of a difference to it... even though a 5.5k image is aways less sharp and more grainy than FF but the difference is pretty slim, to a level that it can be ignored for most cases.
 
With digital is a bit of a moving target, I agree. But I wouldn't factor in finished resolution. Its either sharp at capture or its not.
Mike .. Its just one of those things thats nice to have on a card in your lens case. No need to drag out the calculator on set. If it wasn't so darn cold out I would do some tests.
 
Ted Parkes said:
With digital is a bit of a moving target, I agree. But I wouldn't factor in finished resolution. Its either sharp at capture or its not.
Mike .. Its just one of those things thats nice to have on a card in your lens case. No need to drag out the calculator on set. If it wasn't so darn cold out I would do some tests.
Click to expand...

Hhaha Touche... After shooting last winter, I completely agree...

The awesomeness of 6k is that you could throw on a super wide lens to get everything in focus from ~3ft-to-inf, and then crop-in "digi-zoom" style to get different FOVs... I know it's cheating and not ideal, but still fun to take advantage of so many pixels!
 
If you are running around with a Movi or doing a walk about handheld or on a drone the Hyperfocal distance is a great way to go. It would be nice to have a dragon chart.
 
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