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stacker:docs:tables:landscapes [2013/06/05 06:40] rjlittlefield |
stacker:docs:tables:landscapes [2021/10/27 00:47] (current) rjlittlefield |
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| ====== Focus Tables for Landscapes and Other Large Scenes ====== | ====== Focus Tables for Landscapes and Other Large Scenes ====== | ||
| - | First, do you have an iPhone or iPad? In that case, consider getting a copy of the **FocusStacker** app, by [[http://www.georgedouvos.com/douvos/OptimumCS-Pro%3B_TrueDoF-Pro%3B_FocusStacker.html|georgedouvos.com]]. It does pretty much the same thing these tables do, and it's a lot more fun to use and carry around. Otherwise, keep reading. | + | First, do you have an iPhone or iPad? In that case, consider getting a copy of the **FocusStacker** app, by [[http://www.georgedouvos.com/douvos/OptimumCS-Pro%3B_TrueDoF-Pro%3B_Focus_Stacker.html|georgedouvos.com]]. It does pretty much the same thing these tables do, and it's a lot more fun to use and carry around. Otherwise, keep reading. |
| When shooting landscapes and other large scenes, you can use the following tables to estimate required number of frames and optimum focus distances measured as meters or feet in front of the camera. | When shooting landscapes and other large scenes, you can use the following tables to estimate required number of frames and optimum focus distances measured as meters or feet in front of the camera. | ||
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| - | // (Tech note: The math underlying these tables is based on wave optics and guarantees no more than 1/4-lambda wavefront error for green light at the worst focus distances. Roughly speaking, this corresponds to no loss of fine detail and no more than 25% reduction of MTF at any spatial frequency. Send email if you want more information.) // | + | // (Tech note: The math underlying these tables is based on wave optics and guarantees no more than 1/4-lambda wavefront error for green light at the worst focus distances. Roughly speaking, this corresponds to no loss of fine detail and no more than 25% reduction of MTF at any spatial frequency. The numbers in the table can be closely reproduced by this formula: // |
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| + | * // Focus distance in meters = 1 / (1/FL - 1/(FL+ (FrameNumber-1)*(0.00055*(2*FNumber)^2) )) / 1000 // | ||
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| + | // Send email if you want more information.) // | ||
| ^Aperture setting: 5.6 ||||||||| | ^Aperture setting: 5.6 ||||||||| | ||