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Film Focus and Projector Focus Incompatibility on Super 8

super 8 film projection projector problem focus problem

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#1 Kurt Cassidy-Gabhart

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Posted 06 March 2016 - 08:47 AM

Dear Cinematographers,

 

The problem pertains to the Vivitar 733A super 8 film projector, which has been serviced, but has also been sitting in my closet without proper attention for several months. When I project a roll, and focus for the sharpness thereof, the projector's frame is out of focus - noticeably blurred around the border; - and when I focus for the projector's frame, the film is out of focus. Is the problem mechanical, thus requiring me to have it serviced again, or purchase a new one; or simply the result of my own ignorance? I would be sincerely grateful for any assistance in this matter.

 

Kindest Regards,

 

Kurt Cassidy-Gabhart

 

 

 

Would that it were so simple!


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#2 Mark Dunn

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Posted 06 March 2016 - 08:57 AM

It isn't a 'problem'. The gate is not supposed to be sharp when the picture is in focus.

You get rid of the blurred edge by filling the screen, or by masking.


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#3 Kurt Cassidy-Gabhart

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Posted 07 March 2016 - 10:27 PM

Dear Mr. Dunn,

 

Is the frame not perfectly sharp then in larger format projection? It always seems so, but perhaps that is on account of the screen being, as you call it, filled in - am I correct in this presumption?

 

Sincerely,

 

K. Cassidy-Gabhart

 

 

Would that it were so simple!


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#4 Mark Dunn

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Posted 08 March 2016 - 03:59 AM

No. You're seeing the black screen mask in  a cinema, not the gate shadow- or you should be.


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#5 Mark Dunn

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Posted 08 March 2016 - 06:03 AM

When you project a slide, you get a nice sharp edge from the mount, which is in contact with the film for that very purpose. With moving ciné film, the gate is polished and bevelled away from the film to avoid damage. So it can't possibly be in focus.


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#6 Kurt Cassidy-Gabhart

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Posted 08 March 2016 - 09:39 PM

Dear Mr. Dunn,

 

I regret sounding like an ignorant fool, but what exactly is a black screen mask and how would I best prepare one in projecting super 8? I really appreciate the information.

 

Sincerely Thankful,

 

Kurt Cassidy-Gabhart


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rebotnix Technologies

Pro 8mm

Visual Products

Tai Audio

Paralinx LLC

Glidecam

CineLab