[Laser] Fresnel lens

[laser@mailman.qth.net]

In a message dated 11/17/02 7:47:04 PM GMT Standard Time, 
avilaseca@bluewin.ch writes:


> Hello
> 
> Why not just try both ways?
> 
> I tried some time ago and i recall the image at the focal point was
> sharper with the lens the *right* way around. unfortunately, i cannot
> remember which way it was...
> 
> 73 
> 
> Angel HB9SLV
> 
> 

Thank you Angel.

I'll try both ways and see what the difference is.  However today I cut the 
frame for the recommended 212mm focal length so in the longer term, the lens 
will be fitted as intended by the manufacturers.

Thanks for the comment on focusing in the 'reverse direction'

73

David


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