Like the Konica Tomato/Pop-10, the brightest f-stop is the only one given in the manufacturer’s literature. Unlike the Tomato, I couldn’t find information on line so I had to do it myself.
If you don’t care how I arrived at these values and trust a random web page, here’s a table:
These values are rounded to the nearest whole stop. YMMV. Not responsible for ruined shots, hives, divorce, or any negative outcome resulting from the use of this information.
The camera is dark gray or black but the LED lights made it look blue.
Trusting that 35mm really is the focal length and f/4 really is the brightest f-stop:
35mm / 4 = 8.75mm diameter with the lens wide open.
The area is what’s important for exposure. Focal length/diameter=f-stop only holds for circular apertures. For most, I treated the shapes like diamonds and used (b x h)/2 for the area. To keep things simple, I cropped in to the edge of the lens and then resized to 875 pixels so 100 pixels is one millimeter. Once I had an approximate area, I used the equivalent circle area to get a diameter. SensorsOne has a great calculator so I could just plug in the area instead of using a calculator and working backwards from area=π r² every time.
The last one was still approximated to a diamond but I had to be more accurate as the apertures got smaller.