my profile | my password | search | faq & rules | forum home

» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » Schneider 100 mm

Author Topic: Schneider 100 mm Miguel Ercolino Film Handler Posts: 3 From: Caracas, DF, Venezuela Registered: Nov 2003 posted 12-08-2003 04:05 PM                     Hello this is my first post, and excuse me for any mistake but English is not my primary language. I am having troubles with 100 mm Schneider prime lens installed in Cinemeccanica turrets, I have focusing problems, i focus the lens but every time that the turret change lenses the image appears blurr again, i dismounted the lens and the prime lens sounds like a "maraca" when you shake it, i send to repair it and the middle lens is not firmly attached, anyone has the same trouble, or Schneider know the problems. Thanks for your response Miguel  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 12-08-2003 04:29 PM                     Loose elements can happen but is not the norm with Schneider. However what I have found is that with two-part lens assemblies (the ones where they can be separated about half way through the lens...they can unscrew...especially if they are heated up a bit. Make sure your lens (I can't remember if the 100mm is a two parter...most of the lenses above 100mm are two-parters) is indeed screwed together tightly. The rear part (the part where it steps down closes to the film, may be loose and just justs a little twisting. Steve  |  IP: Logged Richard Fowler Film God Posts: 2392 From: Ft. Lauderdale, FL, USA Registered: Jun 2001 posted 12-08-2003 04:43 PM                     The newer Schneider and Isco lenses are air spaced with spacer rings to locate the lenses within the lens tube. The lens tube will be two parts at 100mm which you should tighten with the lens pointed upward to help reseat the lenses on their internal spacers....in most cases this will resolve this. I find people will pull on the lenses if moving the turret manually which will sometimes cause this problem.  |  IP: Logged Randy Stankey Film God Posts: 6539 From: Erie, Pennsylvania Registered: Jun 99 posted 12-08-2003 05:00 PM                     Years ago I had this same problem. I don't know the exact fl. of the lens but there was a loose element inside. It did rattle around inside there like you say. For several weeks the booth kept getting calls to fix the focus in one house. ALL of us guys, SWORE that we focused the image perfectly. In a few minutes it would be out of focus. We kept getting blamed for it. After many hours of screaming and hollering we finally suspected the lens. Upon examination, it was found to be bad. When it was finally sent back for repair/replacement the problem was solved.  |  IP: Logged Ron Yost Master Film Handler Posts: 344 From: Paso Robles, CA Registered: Aug 2003 posted 12-08-2003 06:25 PM                     Why aren't they made more securely in the first place? IMHO there shouldn't be any possibility of glass elements working loose, under normally expected operating conditions, to the point where the image suffers. Pretty poor engineering and/or cost-saving production methods, I'd say. These are top-line, not exactly inexpensive items, after all. Ron Yost .. owned a -very- sloppy Schneider at one time.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 12-08-2003 06:28 PM                     Actually it isn't sloppy engineering it is improper handling at the users end is the often problem  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 12-08-2003 07:18 PM                     Actually it was pretty common going back 8 or 9 years for the Schneiders to work themselves loose. I've had to crawl around more than once to find len elements, spacers,rings and other parts on booth floors. Schneider finally started applying a bit of paint or some type of sealent to the rings when they were assembled. This loosing up is caused by repeated heating and cooling of the lens and this is normal for all lenses. In that case the threaded rings managed to really work loose. Don't recall ever having a problem with ISCO's though. Mark @ CLACO  |  IP: Logged

All times are Central (GMT -6:00)

Printer-friendly view of this topic

Hop To: Select a Forum: Category: Operations -------------------- Digital Cinema Forum Film Handlers' Forum Large Format Forum Ground Level Feature Info, Trailer Attachments & REAL Credit Offsets Category: Community -------------------- Film-Yak Film Handlers' Movie Reviews The Afterlife Bob Maar's Joke-A-Thon Category: Classified -------------------- Equipment and Supplies Wanted/For Sale Help Wanted/Seeking Employment Category: System -------------------- Software Beta Testing Forum

The Film-Tech Forums are designed for various members related to the cinema industry to express their opinions, viewpoints and testimonials on various products, services and events based upon speculation, personal knowledge and factual information through use, therefore all views represented here allow no liability upon the publishers of this web site and the owners of said views assume no liability for any ill will resulting from these postings. The posts made here are for educational as well as entertainment purposes and as such anyone viewing this portion of the website must accept these views as statements of the author of that opinion and agrees to release the authors from any and all liability.