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Super 35 Conversion Help

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I swear I did something wrong when I cross check. From what I gathered, it seems to be around 1.6x crop from Super 35 to FF. People said 1.34x crop on 1DX ii 4k, but I tested it and found it to be 1.29-1.30x. I converted the Super 35 focal's to FF at 1.6x, then I converted S35 to 4K crop (x)(1.3). When I cross check the 2 charts (28.8/23.4) I get a 1.23x ratio? To get a 1.3x ratio, I can take the 18mm S35 equivalent of 28.8 & divide by 1.3x to get 22.1mm for the S35 equivalent which checks out (28.8/22.1=1.3).

For whatever reason, I am not wrapping my head around this haha. I feel like 22.1mm should be the correct 18mm equivalent of 35mm if I am shooting in Canon 1DX ii 4k 1.3x crop mode. It can't be 23.4mm equivalent right? 

 (Tested) 4k to FF Ratio: 22(22.5?)mm 4k = 29mm FF. 4K to FF Ratio seems to be 1.29x

Super35 to FF (1.6x)
18mm = 28.8mm FF
21mm = 33.6mm FF 
25mm = 40mm   FF
30mm = 48mm   FF
35mm = 56mm   FF
40mm = 64mm   FF
45mm = 72mm   FF
50mm = 80mm   FF
53.1mm = 85mm FF

Super35 to 4K (Canon 1DX)(1.3x)
18mm = 23.4mm
21mm = 27.3mm 
25mm = 32.5mm
30mm = 39mm
35mm = 45.5mm
40mm = 52mm
45mm = 58.5mm
50mm = 65mm
65.38mm = 85mm

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Okay, so a few things.

Super35 is technically a 1.44x crop (I GOT THIS NUMBER WRONG AT FIRST, EDITED IT NOW) when compared to full-frame. However on Sony it's a 1.5x crop, on Canon a 1.6x crop for their aps-c sensors. If you want to match the angle of view of Canon aps-c (1.6x crop) to that of the Canon 1dx II, it's important to remember that the crop factor is compared against a specific sensor format, namely that of full-frame 35mm (so NOT Super35).

So the aps-c crop is heavier than that of the 1dx II (1.6x as opposed to 1.3x when compared to full-frame). This means that if you want to to match the angle of view of a aps-c sensor to a 1dx II (4k) angle of view, you will have to apply a NEGATIVE crop (because you're actually getting a wider angle of view, not narrower). That crop is about 0,8x.

So it will look like this:

Super35 (canon aps-c) to 4K (Canon 1DX)(0.8x)
18mm = 14,4
21mm = 16,8

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Sorry I didnt clarify great: I was just trying to figure this out to compare with movies I like. I know most were shot on 35mm film cameras (Panavision etc.). Havent had enough time to research the fov and everything to compare. I wanted to see what the widest I can go on FF & my 4k crop mode without exceeding the 35mm film at 18mm. That is probably around 24mm max width on FF? I saw many were mostly shot between 18-30mm in S35. 

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So Super35/the Arri Alexa (90% of movies you will have seen will be shot on those formats) have a crop factor of around 1.45 (I got this number wrong at first, updated my earlier post), unless they were shot anamorphic in which case we get into the story of horizontal crop factors and we get really freaky, which we will not do now.

Your 1dX II has a crop of around 1.3, so the angle of view is WIDER. If you don't want to exceed 18mm angle of view when compared to s35, you'll have to put a tighter lens on your 1dx mark II. In your case the crop factor of a 1dX II when compared to super 35 would be around 0,9, so you wouldn't want to go wider than a 20mm roughly.

However, to make your life easier: in real life a crop factor of 0,9x is is so incredibly, insignificantly small that it really doesn't matter, just go for the same lenses you would use on Super35 and you'll be fine.

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No problem! Just to clarfiy, the 1.44x crop of super 35 is against FULL-FRAME (again, in 4k your 1dx mark II is not the same width as full frame).

Full frame sensor width is 36mm.
Super 35 film width is 24,89mm.
1dx mark II in 4k sensor width is 27,5mm (give or take).


36/24,89= 1,45. So the crop of super 35 compared against full-frame is 1,45x.

27,5/24,89= 0,91x. So the crop of your 1dx mark II in 4k compared against super 35 is 0.91x. You can do this in all directions.

24,89/27,5=1.10x. So the crop of super 35 when compared to the 1dx mark II in 4k is 1.10x.

Again, this is all theoretical, because a 1.10x crop is meaningless.

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