The Fresnel lense can be designed and manufactured in very large sizes with light weight due to less than 4mm thickness, so the cost will be lower than traditional magnifiers. In contrast, a conventional glass lens would be 200mm thick at the edge, weigh over 50kgs and cost thousand of dollars.
the range of application:
It is suitable for projector, epidiascope and also suitable for solar energy collector system, start a fire under sunlight, hot water heater, solar furnace, stage light, LCD projector, AV projector, home cinema magnifier and so on...
one piece per plastic bag, suitable quantity per carton box or as your own requests.
1 .Air Shipping : 1week, cost much 2 .Sea Shipping: about 1 month , cheap cost. 3 .International Express: 5-7workdays, door to door service. (DHL,UPS,TNT,FEDEX,EMS)