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NPR PL mount - canon 8-64mm


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#1 stoop

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Posted 14 March 2007 - 02:48 PM

I have a nice 16mm shoot coming up next month. We're going to be shooting on a Eclair NPR that's been converted to PL mount and Super 16mm.

I want to hire the Excellent Canon 8-64mm zoom lens. Will this lens fit without any fouling issues, and will it work just fine. I won't have to get anything re-collimated for example???

Many Thanks guys.
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#2 Bernie O'Doherty

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Posted 14 March 2007 - 03:11 PM

Hi, If you cant check the flange focal distance with a gauge, then the next best thing would be to check the camera with the lens mounted.
Set up the camera on a tripod and measure 5 feet to a focus chart or a newspaper taped to a wall.
Set the diopter to your eye...on the grain of the groundglass.
Focus, zoomed in/close on the chart.
You should come to 5 ft on the lens focus markings.
Now zoom wide and you should hold focus throughout the range.
Good luck
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#3 chuck colburn

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Posted 14 March 2007 - 05:40 PM

I have a nice 16mm shoot coming up next month. We're going to be shooting on a Eclair NPR that's been converted to PL mount and Super 16mm.

I want to hire the Excellent Canon 8-64mm zoom lens. Will this lens fit without any fouling issues, and will it work just fine. I won't have to get anything re-collimated for example???

Many Thanks guys.


Here make it easy on your self. Do what Bernie says but make a copy of this target the larger the better (up to a point). Put the camera as close as you can and focus on the center so when you zoom wide the target stays as large as possible. It's easier to see zoom shift, tracking errors and back focus miscalibration (if any) that way.

Chuck

http://en.wikipedia....iemens_star.svg

Edited by chuck colburn, 14 March 2007 - 05:43 PM.

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#4 Mitch Gross

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Posted 15 March 2007 - 09:01 AM

That's a pretty front-heavy lens to put on the NPR's turret mount. I'd be concerned for field flatness -- the lens may pull the top of the turret away from the film gate, so that an image may be in focus on the bottom of the frame but not the top. It's something you would not likely be able to see by eye, and we're talking about an accuracy measured in microns here. I would want to support the lens in some way other than the mount, but I'm not sure how you'd do that on an NPR without some custom machining.
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#5 Dennis Kisilyov

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Posted 15 March 2007 - 01:44 PM

James (stoop),

And there I thought you've given up on film. :-).

Canon 8-64 in PL mount seems to be a fairly standart rental item, I'm sure it's up-to par, collimated and such.
At T2.4 you have plenty over the f2.8 you've used on the last project.

Just run some test film through the setup, even in the rental house. They should have a resolution chart.

Edited by Dennis Kisilyov, 15 March 2007 - 01:48 PM.

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