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The type of lense is a convex lense
Fresnel lens
There are alot of used 8mm projectors out there on various websites but no one has any new ones for sale. The used range from $300-400.
double convex
Lenses for video projectors are normally designed and manufactured for each projector. Although some manuafacturers such as Sanyo, Barco and NEC make large projectors with interchangeable lenses, the lenses are still made for specific models. There is no standard for lens mounts as yet and it is unlikely that there will be a standard in the near future.
Movie projectors which are used in film theatre are definitely not practical for use in family room. One can use projection screen or can simple have big plasma screens for family viewing.
A computer projector is a kind of an output device, used to display image on a projection screen. It receives a video signal from computer and projects an image using a lens system.Main types of computer projectors are:LCD projectors,DLP projectors,LED projectorsHybrid ( LED and Laser diode) projectors.
Projectors and screens are used in businesses and in office situations where conferences and meetings are often used. This could be most fields of work but is possibly more likely to be a consultancy type of business.
The small magnifying lens used by jewelers and watchmakers is a loupe.
== == It is used to magnify/ or make things appear closer?to magnify small objects
Most often, laser projectors are used recreationally to enjoy home media by individuals in their homes. This includes laser, mirror, and galvano meter scanners and projectors.
convex lens