Anamorphic Day-to-Day Specials

Anamorphic Cookbook – hFOV Calculator v2.8

December 4, 2016

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Tito Ferradans here to tell you that I’ve updated the anamorphic calculator (or the HFOV Calculator if you wanna be precise).

What is this calculator again? This is a webapp that allows you to input various settings from your camera setup in order to figure out if you’ll get vignetting when using an anamorphic adapter.

You can pick your focal length, camera crop, focal reducer, anamorphic adapter, single focus solution and sensor aspect ratio. These are all the values that I need to tell if you’ll experience vignetting.

This time I coded it all from scratch and the new version is much more like what I originally envisioned for it. It works more fluidly and it’s much easier to update. I did some fixes to the overall math and added many features.

I added a checkbox for pancake lenses, which are more tolerant with vignetting, added another checkbox for Baby Anamorphics and custom rules for their behavior. I also added single focus solutions which influence vignetting and – in some cases – can change your field of view according to the focused distance. Lastly, I included a field that allows you to check if you’re limiting your maximum aperture based on your anamorphic’s rear element size.

The calculator only has two functions. HFOV will tell you what’s the Resulting Field of View and Resulting Aspect Ratio based on your setup. I WANT A TAKING LENS will also take into account your setup but do the math in reverse, using the Resulting Field of View and Resulting Aspect Ratio to tell you which taking Lens will give you that result, and what sensor crop is required. Both buttons will always tell you if you’ll get vignetting or not.

In the last minute I added a second calculator for diopters. You can input your maximum focus and that will give you a diopter strength, or you can input a diopter strength, and that will work out the focus math. If you put your lens’ minimum focus value in, it’ll give you the new minimum focus as well. For expert diopter hunters, this will help you figuring out diopters that aren’t so clear from manufacturers (like the ones that give you what’s the new minimum focus of a given lens, instead of the optical power).

In terms of functionality, every time you input something wrong (mostly characters that aren’t numbers), that field will be red and you can’t do the math until all red fields have been fixed. I also included a donate button at the bottom, because getting the data to build this took me months, and coding it wasn’t easy task either. So, if the calculators are useful for you, you can show it by sending me a little something. Now go break it, and I’ll see you next week.

If you want to include this tool on your website, just copy the code below into your HTML!

To report a bug, miscalculation or send suggestions, please use the form below!