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

» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » need new set of lenses....

Author Topic: need new set of lenses.... Garry Knapp Film Handler Posts: 50 From: Mississauga Ontario Canada Registered: Oct 2016 posted 09-23-2017 11:03 AM                        I'm committing to changing my layout...again... Could someone calculate the lenses I would need for this please? Last time.....for sure.....honest..... 21ft throw 124x53" screen thank you  |  IP: Logged Leo Enticknap Film God Posts: 7474 From: Loma Linda, CA Registered: Jul 2000 posted 09-23-2017 01:57 PM                        You're not giving us any detail as to what format (film or digital, if film what gauge, etc.), aspect ratio, etc. etc. Assuming 35mm and 1.85, it looks like 40.5mm (124" = 10'4" and 53" = 4'5"): This software is available for download in the Warehouse section (under "Schneider lens calculator"), so you can do the others yourself. It works under every version of Windows from XP to 10, although the Schneider part numbers it gives you are probably meaningless now. But the only crucial piece of information you need is the focal distance, which it'll also tell you. For digital projectors, this software is no good: the size of the DMDs is different (and differs between light engines, too), so you need the calculator supplied by the manufacturer for the specific projector model. Barco has an online one, and NEC supplies an Excel spreadsheet.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 09-23-2017 02:12 PM                     And that is an old version of it too. That version works on Win98SE, I think too.  |  IP: Logged Randy Stankey Film God Posts: 6539 From: Erie, Pennsylvania Registered: Jun 99 posted 09-23-2017 03:11 PM                     I have always used the cross-multiplication method. Size of image on film * focal length = size of image on screen * throw Plug in your known values then solve for the missing. Round your result to the nearest available lens size. Don't forget to add a multiplier for anamorphic factor if you need it. I like lens size calculation programs and have used them when they were available but just doing the math has never failed me.  |  IP: Logged Garry Knapp Film Handler Posts: 50 From: Mississauga Ontario Canada Registered: Oct 2016 posted 09-23-2017 05:23 PM                        sweet! thanks guys! I will go grab that out of the warehouse!  |  IP: Logged Garry Knapp Film Handler Posts: 50 From: Mississauga Ontario Canada Registered: Oct 2016 posted 09-24-2017 08:10 PM                        thank you Leo I found it...and after playing with it for an hour (which was fun, its a great program) i determined my best options for the new setup. Thank you again. Film is fun  |  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.