A guy needs a glass lens 75mm diameter lens + or - with a focal distance of 200mm to heat water with the sun! I am not sure of the application? What lens? I'm thinking a 75mm +4.50
A guy needs a glass lens 75mm diameter lens + or - with a focal distance of 200mm to heat water with the sun! I am not sure of the application? What lens? I'm thinking a 75mm +4.50
I think a lens of +5.00 would come closer to a 200mm focal length.
Where do you get a plus 1
Cat, Wes is agreeing with Chip. (As I do, a +5.00 has a focal length of 200mm.)
Making one of these?
Integrative Pressurized Solar Water Heater-HP........a little more expensive than a lens but more effective
http://honger88.en.made-in-china.com...Heater-HP.html
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