General optical question

[len00x]

Hello,

I am using a scanner to scan some Super8 film strips.
But my scanner's optical resolution is not high enough for my needs and I don't want to spend $300 for a 3200x6400 dpi scanner.

So I just thought about building a little lense-system to enlarge the super8 picture to about slide's size (~35 mm).

I tried it with a simple magnifying glass (see picture) but the picture gets unsharp :(.

Has someone experience with such things, or can tell me a good website?

thanks,

Harry