[Charlotte]

f4 is just in the title at the top, while the rest of the listing says f2.8 all the way thru, so I would take it as f2.8. BUT it's as well to watch out for these things, especially something like this that costs a lot of money, because if you do end up with something other than what you were expecting, you would have a problem taking it up with ebay or paypal if the description within the listing is deemed as 'correct'.