>>4156666the 1d is so old (not sure about your elan) that menu based control wasn't a thing so much, it still has a top-lcd for shooting settings like the pro film bodies did. I suppose "menu operation" is a misnomer in this case, camera functions would be more apt. but you're right, you have to hold down the iso button, spin the wheel to where you want, let go and keep shooting. if you spent enough time with it you'd get it down pretty well since it can be adjusted live without needing to look out of the viewfinder. it was well regarded back in the day by people switching from film. but we didn't really know better 22 years ago lol.
>picrel is the control scheme, can you decipher it? 