I'm sorry, by massive plus, do you mean massive penalty? As in, penalty to roll? I'm a bit confused by your phrasing, but I think I've sussed out what you meant.
So, in landing, first you roll the photo recon levels, then you roll for the actual landing. If you roll under the photo recon level, all is good, but if you roll over it a penalty is applied to the landing roll, is that correct?
Sorry about that. It means that the die roll made for your landing will have a 30 added to it. So if a normal die roll was 70, you would add 30 to it if you failed your photo recon check, and you just made a new crater on the moon!
If you are not sure of the order, just look at the mission. It tells you the exact order or safety checks.

Cheers, Thor