all right, thanks everybody.
Jo, you said something about subtle distinctions. what do you mean by that? is the quality of the photo will be bad?
what is the maximum size its best to print from a scanned 35 film that wouldn't make the photo look bad , i.e. with pixels?
By the way, I have epson 4490 and the quality is ok, but I'm wondering which one will give me better results.
So there is several scanners of epson v, like 200, 500, 600, 700, 750, 800.
Is there a bigh difference between them?
thanks,
victor.
By subtle distinctions I mean quality differences in the scans between different hardware. Scanner performance differences deal with resolution, focus/sharpness, color rendition, and tonal range. We want the scanner to give us a sharp detailed scan with faithful color and a full range of tonality. A further complication will be the software that controls the scanner. Unfortunately many scanners are sold with poor software and/or software that's designed for the consumer market and in fact interferes with getting the most out of the scanner. Gary noted Vuescan as a software option. It's very good (much better than Epson software) but more money to spend. If you know what you're doing you can usually make the OEM software work but many people don't know what they're doing. A lot of the complaints I see about Epson V series scanner performance are really complaints about how the software sucks and the user doesn't know how to get around that.
The Epson V series are much better than the 4490. Differences in the various V series scanners are mostly age/model differences and options differences. Performance is very similar across the entire line. For example the 800 models are replacements for the 700 models. The top of the line 850 has a full size lighted lid so that it can scan your 8 x 10 sheet film. Got a lot of that? The 200 has a strip light in the lid that can only scan 120 and smaller film and so you're stuck with no way to get all your 4 x 5 sheet film scanned. Big problem for you? The 200 can only scan two strips of 35mm at a time instead of a full page and so on.
You got the subtle distinctions remark from me and "go big" comment from sabbath999 because we think 50 x 60 from a 35mm original is past the limits of "pushed to the limit." This is a very difficult issue to give you any kind of a solid answer. Enlarging the size of a photo is a process that degrades the quality of the photo. For example Edward Weston simply wouldn't do it at all and instead made contact prints from 8 x 10 negatives. Think of that as the extreme position on one end. Few of us are that extreme, but 50 x 60 from 35mm is certainly towards the other end of that scale. I'm pretty conservative and so if I knew I wanted prints in that size I'd be shooting bigger film. If I had only 35mm originals I'd make smaller prints, but you're not me and you'll have to find the limits that satisfy you.
Here's a real 35mm example:
http://photojoes.net/columbine_4000.jpg
The film is low ISO (100) Fuji RDP. That's a 4000 ppi scan. That's already overkill. At about 3000 ppi you reach the point of diminishing returns for film. In other words you're scanning the film grain at that point and there's not much advantage to trying to scan in between the film grains

That's the full image uncropped and let's say you want to print it. At 300 ppi which is the standard for high quality print output you're going to get a 16 x 20 print. To print any larger you have to lower the ppi of the image. At 225 ppi you can get a 20 x 30 print. Arguably the difference between 300 and 225 is pretty minor to negligible, but we're no where near 50 x 60 yet -- you'll have to drop to 100 ppi to get there and most people will tell you that dropping below 150 ppi is the cut off point for acceptable. Scanning at higher resolutions is just faking it (4000 ppi is already faking it) since there's really nothing more there to scan so how do you get to 50 x 60.
That slide was scanned on an Epson V 750 in my office. You'll get the same result from any of the Epson V series.
Joe