I didn't mean what kind of image would use 17x25. I can figure that out. ;-)
I meant what kind of printer uses it, and how? I print 16x24's on my 4800 now using 17" roll paper. I'd love to use pre-cut (and flat!) 17x25's, but I don't think I'd want to do a lot of hand feeding of individual sheets. Will the 3800's paper tray take 17x25's?
Nill, the 3800 has 3 feeders. There is a back manual feeder for heavier papers--like the VFA, Photorag, watercolor, Ultrasmooth, canvas, etc. This is handfed and you can feed any size up to 34.4" one sheet at a time (the manual says 22" but I'm guessing this is because there are no Epson sheet papers longer than 17 x 22). There is a middle feeder or 'auto' for multiple sheets--but not a 'tray'---this is for paper like luster, semigloss, lighter weight mattes and also specifies 22"--but again, no reason that you can't feed multiples of 34.4" that I can see--as long as you have some way to support those (my long sheets lean up against the back wall). The manual says 10 sheets of the longest luster paper in this feeder. The front manual feeder is for quite heavy papers like posterboard. This again is a manual one sheet at a time feed. I've had no reason to use it yet--but would again assume that you could print up to 34.4" in length.
On one of the other forums, there is one person feeding 36" paper--with 34" prrints assuming 1" borders on each end). He didn't specify which paper (or I don't remember) and he didn't say if he was handfeeding--but I'm guessing so with that length which could be a bit unruly I would think--because of lack of support in the printer and needing additional support for the length.
I looked at the specs and the picture of the 4800 and see what you are saying about a tray--no, the 3800 has no such. Look at this picture [a href=\"http://www.epson.com/cgi-bin/Store/WideFormat/WideFormatDetail.jsp?BV_UseBVCookie=yes&infoType=Overview&oid=-14081&category=Wide+Format+Printers]http://www.epson.com/cgi-bin/Store/WideFor...Format+Printers[/url] and you will see the long sheet coming from the top of the printer--that's in the auto feeder where you can feed up to 10 long sheets (20 of shorter length and 120 I believe of plain paper. The paper laying approx where the 4800 has a try is paper to be fed into the manual feeder for very heavy media.
Hope this helps.