Tuesday, August 25, 2020

DOFIS Tweaked

Just a short post to say I've tweaked the beta release of DOFIS to make it more user friendly. All the basic functionality remains as before, ie to give you infinity blur information and aid your focus bracketing.

The first change is that you can register lenses and select Auto to have the script automatically load the right lens model for you. I recommend this as the default, as if DOFIS doesn't find a lens model, it will default to a simple thin lens model.

You can tell what model is being used by looking at the DOFIS (blurs) feedback window (in the top right of the ML bars). If you see a T, this means a thin lens model is in use. If you see an S, then a split lens model is being used. If you see a ?, this means you need to go to the DOFIS menu and select the right option. 


In the above screen capture we see DOFIS being used with a Sigma 12-24mm at 12mm and at f/8. ML tells us we are focused at 2.19m and DOFIS tells us we are using a split lens model, that we are beyond the (overlap) hyperfocal, that the infinity defocus blur is 9 microns, that the diffraction blur is 11 microns and that the total blur at infinity is 14 microns.

You can explicitly enter a lens in the DOFIS menu, but I recommend adding your lenses to the DOFIS script and selecting the Auto option. DOFIS comes with two lenses loaded: a Sigma 12-24 and a Canon 24-105.

The format for the lens data is:

mylens[1] = {}
mylens[1][1] = "12-24mm" -- lens name
mylens[1][2] = 0.17 -- MaxMag
mylens[1][3] = 280 -- MFD
mylens[1][4] = 24 -- FL at MaxMag

In addition to needing to know your lens' minimum focus distance, maximum magnification and the focal length at the maximum magnification, you also need to know the lens name by simply going to the DOFIS menu and toggling through the Additional Info menu.

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