Ask the seller to tell you the serial number of the 28. Then go here: http://www.photosynthesis.co.nz/nikon/serialno.html
Click on 28 at the top and find your lens type by the serial number. If the lens is AI-S, take the 28. If not then I say it doesn't matter unless you have a preference when it comes to focal length.
f/2.8 AI-S has CRC and is incredibly sharp when shooting close. To make things sweeter, its MFD is only 8in (20cm). As opposed to most other wide Nikkors, the way f/2.8 AI-S renders the OOF areas is very pleasing (though this is highly subjective) and it has very nice colors.
Last edited by OldBodyOldSoul; 02-10-2013 at 03:59 AM. Click to view previous post history.
Reason: unless you have instead of since you don't have (assumption is the mother of all bad posts)