Need help in choosing the fresnel and lens

[serein]

Hi,

I have recently contacted one of the lens manufacturers in India and they have sent me the following details about the Lens and Fresnel.

Please help me in choosing the right parts for building the projector.


Description

SINGLE FRESNSEL LENSES – NORMAL
Size : 285 X 285mm (Squ.)
Focal Length : 340mm
Thickness (mm) : 2 mm 500/-

SINGLE FRESNSEL LENSES – NORMAL
Size : 285 X 285mm (Squ.)
Focal Length : 220mm
Thickness (mm) : 2 mm 500/-


SINGLE FRESNSEL LENSES –
A4 SIZE
Size : 310 X 310mm (Squ.)
Focal Length : 340mm
Thickness (mm) : 2 mm 500/-


SINGLE FRESNSEL LENSES –
A4 SIZE
Size : 310 X 310mm (Squ.)
Focal Length : 220mm
Thickness (mm) : 2 mm 500/-


Fresnel lens
Size : 480 X 640mm (Rect.)
Focal Length : 600mm
Thickness (mm) : 4 mm 1650/-


FRESNEL CONDENSER LENS (FOR NORMAL OHP) :
SIZE : 285mm X 285mm
FOCAL LENGTH : 216mm&343mm
THICKNESS : t = 4mm
PITCH : p=0.5mm 1000/-


FRESNEL CONDENSER LENS (FOR A4 OHP) :
SIZE : 310mm X 310mm
FOCAL LENGTH : 216mm&343mm
THICKNESS : t = 4mm
PITCH : p=0.5mm 1000/-



TRIPLET LENS–THREE ELEMENT PROJECTION LENS
(a) BARREL DIA :74mm
(b) F# 5.2
(c) EFL 317mm
(d) Heat-resistant Plastic case
(e) Specially coated lenses for optimum sharpness and brightness

 

[bigbalddude]

You are not providing enough information to answer that question. That's why you didn't get an answer to the same question over at lumenlab.
What size is your LCD?
What size do you want your projection to be?
How far away from the screen do you want the projector to be?

Answer these questions and we can help you in choosing the correct lenses.