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S4 36 degree Focus problem

Hi all,

We have a number of S4 36 degree lenses, recently one of our customers noted that when shuttering down the lower projected shutter had a "bleed through" or "shadow".

we have looked at most of our kit and this is true for a lot of our units, also I can not focus out to get the "doughnut" or dark area,

we have cleaned the most of the lenes's, one at a time so as not to mix things up, all back in the right slots, only got this problem with 36 degree 

has any one else had this problem ?

and if you did how did you fix it ? 

Parents

  • It's true... this has always been a problem with the 36° lens tubes.  Bench focusing the lamp can help a bit, but you'll never get it as crisp as a 26° or 19° tube will be.  In practice, I never expect to get a clean field or a sharp edge out of a 36° fixture, and I try to put frost in them whenever possible.  Frost goes a long way to hide their less-than-perfect optics.

    If you require better optics from a 36° lens, take a look at the Enhanced Definition Lens Tubes (EDLT).  You'll get crisper sharp edges and darker blacks, and the biggest difference vs. a standard tube is a 36° EDLT for sure.

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  • It's true... this has always been a problem with the 36° lens tubes.  Bench focusing the lamp can help a bit, but you'll never get it as crisp as a 26° or 19° tube will be.  In practice, I never expect to get a clean field or a sharp edge out of a 36° fixture, and I try to put frost in them whenever possible.  Frost goes a long way to hide their less-than-perfect optics.

    If you require better optics from a 36° lens, take a look at the Enhanced Definition Lens Tubes (EDLT).  You'll get crisper sharp edges and darker blacks, and the biggest difference vs. a standard tube is a 36° EDLT for sure.

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