Using 2 (or more) lenses

[r3500vdp]

I'm still experimenting but it looks like I will need to use 2 lenses to capture the source image fully. Currently I use a bi-convex lens (D=60 mm, F=150 mm) which for projection purposes is very good. However it does not capture the image to be projected fully (7 by 7 inch). I'm thinking of combining this with a concave lens. Has anybody experimented with this? Any do's or dont's? Links?

Mathieu

 

[ywh]

I'm still experimenting but it looks like I will need to use 2 lenses to capture the source image fully. Currently I use a bi-convex lens (D=60 mm, F=150 mm) which for projection purposes is very good. However it does not capture the image to be projected fully (7 by 7 inch). I'm thinking of combining this with a concave lens. Has anybody experimented with this? Any do's or dont's? Links?

Mathieu

yes , combining this with a concave lens.
Using 2 :
get a lens of glasses of myopia, at the glasses shop ,maybe that is degree:200, or 150,250,300,try it ,if the focus is 300MM,
it can capture the image 14inch

Using 3:
that is a standard lenses of OHP, DIY is not easy.it's price is US$40 in Canton

 

[r3500vdp]

Thanks a lot for the feedback. I will try to find the appropriate lens at the surplusshed.com. Moments like this make me wish I had paid more attention in school during science class, years and years ago!

Mathieu