Verifocal zoom powers

[Rakin]

When adjusting a verifocal for a location how do I tell what power or lens size I have adjusted to? For instance my 5231 goes from 0 to 2390 and I’m trying to figure out what fixed lens I need for that location


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[Walrus]

By scaling the number. I'm assuming IPC-HDW5231R-ZE with 2.7mm-13.5mm zoom. 0 = 2.7mm. 2390 = 13.5mm. That gives 10.8mm adjustment. 10.8mm/2390 = 0.0045mm per point.
If you have it at say, 1350, that would be (10.8/2390)*1350+2.7mm = 8.8mm

 

[Rakin]

By scaling the number. I'm assuming IPC-HDW5231R-ZE with 2.7mm-13.5mm zoom. 0 = 2.7mm. 2390 = 13.5mm. That gives 10.8mm adjustment. 10.8mm/2390 = 0.0045mm per point.
If you have it at say, 1350, that would be (10.8/2390)*1350+2.7mm = 8.8mm

Ok makes sense. So 200 is going to be 3.6. I appreciate it


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[Walrus]

You got it. It might possibly be not quite so linear, but close enough.