In reply to SiWood:
Spot on Si, it is guided at 1:1. So you will need 2 guides and likely be apart on the way up and down.
Don't think for a minute you won't be rushed, there is a bun fight in the hut before you put a foot on snow for position, it is always Swiss guides first, then other guides, then mountaineers doing it unguided.
Any guide will put you under a lot of pressure to move constantly. I seen people being rescued on day 1 from the hut, day 2 on the way up and also down.
Perhaps your best bet will be a Go Pro you can stick your helmet, which can take stills for you and a few pictures with a camera or phone at the summit. This is a serious mountain and you are very naive if you think you can stop as you please to take pictures.
I didn't even get to stop at the Solvay hut, only twice at the shoulder to put on and take off crampons.
If you are lucky enough to get good weather and summit, you'll see and remember the rockfall on the way down and experience first hand why the guides want you up and down.
Also there is a lot of competition to push past people and then issue of when you descend past those ascending with the rope being secured around pigtails or you being lowered from a bolt or going down the sections of fixed ropes.
I also recommend you take a 'soft' water bottle and small pocket size bits of food, (definitely nothing dry like nuts) that you can cram into your mouth on the very moments between waiting at sections of the fixed ropes or whilst the guide is moving on. You won't get to take your rucksack off until you put your crampons on.