Cant figure out what camera to get

Hi all, So im looking at getting a camera for my Orion Red/Black Laser. I have run the camera recommendation tool and I was going for the 8MP 4K Camera but I cant figure out what lense to purchase. The instructions say take the longest of my laser bed and divide by 2.4 for 110 degree lense or or 1.5 for 95 degree lense. I will be able to mount both lenses to my laser, so which one should I get, the one that will sit closer to my bed or the one that sits farther from my bed.

My bed size is 700mm X 500mm

Thanks for any help!

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