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Author Topic: Moving a Projector Sally Ann Burgess Expert Film Handler Posts: 120 From: Queenstown, New Zealand Registered: Apr 2008 posted 08-22-2009 03:12 AM                     Thanks, guys. I have got my Tech hopefully coming in a few weeks so I'll wait and see what he says.  |  IP: Logged Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 08-22-2009 03:45 AM                     On aperture filing: the trick to help knock off some of that shadow is to have the edges of the opening tapered - with the back side of the aperture plate having the taper to the opening. Instead of filing straight across, you'd file in an upward direction to put a knife edge on all four edges with the taper on the back side of the aperture. But, it still doesn't help since on some projectors that the aperture plate is way behind the film plane .. like on some Simplex XL units with the curved gates and those removable aperture plates. This is when masking is deeply needed.  |  IP: Logged Joe Redifer You need a beating today Posts: 12859 From: Denver, Colorado Registered: May 99 posted 08-22-2009 04:04 AM                        I don't think her problem is the aperture and I don't think she should touch it, BUT... ...I have also noticed that proper bulb focus can play an important role in aperture shadows. It can make HUGE shadows that definitely shouldn't be there and are usually corrected by proper adjustment and focus of the lamp, at least on Simplex XLs.  |  IP: Logged Sally Ann Burgess Expert Film Handler Posts: 120 From: Queenstown, New Zealand Registered: Apr 2008 posted 08-22-2009 05:00 AM                     Interesting point about the bulb Joe. Monte I'm not going anywhere near the aperture but thanks!!! Will look at bulb focus tomorrow and report back.  |  IP: Logged John Hawkinson Film God Posts: 2273 From: Cambridge, MA, USA Registered: Feb 2002 posted 08-22-2009 05:37 AM                     Just to beat the dead horse, never file an aperture plate unless you have a brand new one to screw up (preferably a few). Monte...your directions are not very helpful: quote: Monte L Fullmer Instead of filing straight across, you'd file in an upward direction to put a knife edge on all four edges with the taper on the back side of the aperture. How is anyone supposed to know which direction is "upward"? And a taper necessarily goes in two directions. If you have a taper on the back, you will have a taper on the front (unless you taper only half the distance and then change the angle). One side will taper inwards and one side will taper outwards. (But why are you encouraging Sally to try changing her aperture? No offense to Sally, but we shouldn't be recommending filing apertures to inexperienced people...especially not without a lot of warning and careful direction...there are plenty of older threads. It's too easy to screw up. Not to mention the fact that it sounds like her aperture here is just fine!) I'm pretty sure you mean tapering such that the back of the plate is larger than the front, i.e. the side of the plate nearest the film tapers outwards. --jhawk  |  IP: Logged Andy Bajew Expert Film Handler Posts: 136 From: Bellaire, Texas Registered: Jun 2009 posted 08-22-2009 09:49 AM                     With the greatest of respect John, but I completely disagree and feel like I should defend myself and others with your statement about not letting inexperienced people file the aperture plate. Obviously, you won't let a trainee do it, but if they understand how the image is projected and and ratio of aperture size to screen size, then the average projectionist could file an aperture plate. It is just that you need an average projectionist who has a lot of patience, time and a little obsessive compulsion. The head projectionist of three years I replaced couldn't file an aperture plate--long before I replaced him I made two from scratch. Actually, when we first got our projectors we had someone who didn't know a single thing about projection file us all seven aperture plates.  |  IP: Logged Darryl Spicer Film God Posts: 3250 From: Lexington, KY, USA Registered: Dec 2000 posted 08-22-2009 11:00 AM                    I agree with John, we shouldn't suggest filing a plate to someone who may have never done it. The big reason is because we are not their to see what he or she is seeing. You could have other issues that may need to be corrected that would not require the filing of the plates. The projector had an original position when it was installed and plates were filed for it. Over time, depending on the type of floor and other things, the picture image can shift. This does not mean you go and file a plate. You have to make corrections in other places like lens turrets or console height adjustments and shifts side to side. If the projector was not set up correctly in the beginning and then you re-set it up correctly later then aperture plates will need to be replaced. Putting a file in the wrong hands can piss off a tech in the future.  |  IP: Logged Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 08-22-2009 12:42 PM                     I'm not really trying to suggest anything and sorry if it came out that way. Just showing how other techs have trimmed plates.  |  IP: Logged Eric Robinson Jedi Master Film Handler Posts: 538 From: Santa Rosa, CA Registered: Jan 2005 posted 08-25-2009 02:03 AM                     Sometimes learning the hard way is the best way. Otherwise you just follow someones rules which might be right or wrong. Who knows. I made many a mistake when I first took on aperture plates...stupid ones like filing a flat aperture plate when the masking was set to scope. Filing a plate when the lens was out of focus. etc... Certainly it is not a trivial task and it should not be regarded as such. Indeed techs don't like showing up and finding all of the aperture plates ruined.  |  IP: Logged

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