My P45 is H mount so I can share it between Arca-Swiss and H2 (for auto focus ). When I got my A-S, I could not focus with its provided GG; not only it is dark and very grainy its focusing is off slightly even in best circumstances. I got Maxwell Hi Lux Brilliant Matt GG which has much brighter screen with finer Fresnel lens patterns. It does not have the split image focus. I use a Schneider loupe (10x) for final focusing and Wista 5x for general focusing and composingI
As I indicated earlier, I do not have 24mm yet and 35mm is my widest lens. Both you and Prakash are right, it is not easy to focus A-S with its not-so-precise rack and pinion gearing. I wish they would implement more precision gearing for focus, such as the one used in a micrometer.
I believe both 24 and 35mm focus from infinity to close up within less than 1.5mm movement of focusing rail, which is less than a wiggle of the knob.
A question to Adam, I am not totally clear what you mean by the difficulty of focusing entire frame. Is it with front-tilt or without any movement? The image circle of 24mm barely cover the P45 image sensor, 60mm diagonal. I would appreciate it much if you elaborate your experiences in more details. I didn't write the check for 24mm yet.
Sorry for not being precise. I meant, I had a very hard time, with the 24mm, to produce a sharp image, edge to edge with my arca's without any movements - if you standards not are completely align with each other you will get one side of the frame in focus and the other out of focus.
I could not achieve that perfect alignment with my Arca's most of the time.
The 35 mm works ok on the Arca if you are careful. But the 24 are a different beast in my opinion.
I would strongly recommend, if possible, trying the 24mm on your camera to see if it works for you, before you write the check.
Before I got the Alpa XY, I first got the Alpa TC only for use with the 24 mm, a compact and precise solution that don't take up much more space in the bag than a 24 mm on a lensboard - cost is an other story...