75mm aspheric lens source

[moviles]

you recomend this 75mm dx lens? no flood efects?

44mm focal lenght maybe are too much, I dont like lose too many light my favorite 50mm lens have only 19mm focal lenght

the number 9 are my favorite 49.7mm x 22.44mm and 19mm focal lenght ( small focal lenght)

I want 75mm lens with good focal lenght...... but the dx lens have good price...

 

[gt40]

There is no spill on the dx- really nice tight beam and black as night except for the blinding square. I have to re make my head that holds the aspheric as I have some steps in it that form a bit of a cone shape in the space between the led and the lens and it makes a couple of ring reflections. I painted it black but still a bit. If you just hold the lens in front of the sst, there is no spill at all.

 

[moviles]

Which is the best place to buy the 109 leds host for this 75mm lens?

I found it on ebay at 15$ and on dx at 20$, are exactly the same one?

 

[Walterk]

Confident they are 100% same. Maybe difference in single-mode, two-mode.

 

[gt40]

you recomend this 75mm dx lens? no flood efects?

44mm focal lenght maybe are too much, I dont like lose too many light my favorite 50mm lens have only 19mm focal lenght

the number 9 are my favorite 49.7mm x 22.44mm and 19mm focal lenght ( small focal lenght)

I want 75mm lens with good focal lenght...... but the dx lens have good price...

Here is are some beamshots of the 75mm dx lens:

http://www.mccomsey.net/75mm/beamshot1.jpg

farther away:

 

[Walterk]

FYI stumbled upon another resource: topledlight.com

78 x 28mm (for 9USD incl shipping ) and a 100mm lens among others.
They have a shop, and under the same name sell on Ebay.

 

[ak_ping70]

Hello dear friendsWe are a research students in seoul national university and in our project we need to create about 45cm to 45cm squared concentrated beam with minimum or no highlight around it from a distance of 50 cm to 1 meter or a bit higher. which aspheric lens and LED we have to use? I really appreciate any help. (sorry our major is not about lightening system at all but in our project we need to light up such a shape my major is sport science).