Re: [Frameworks] JK printer settings for 8mm to 16mm blowup
Thanks Robbie, its a H16 Rex 5 Bolex. I've used this printer setup to successfully do straight 16mm work in the recent past. In trying out the Super 8 gate I have not yet printed any film. JK recommends a 50mm lens with ballpark distances of 9 from gate to gate, with a 1.5 tube extension and a bellows size of 3.5. This gives me no discernible image looking through the viewfinder. However I can get an image in focus with a distance of 7.5 between gates but this leaves the lens camera near the maximum extension possible on the rails. This would be fine but it doesn't quit fill the frame in the viewfinder. I'm guessing I need further extension tubes. John From: Robbie rahb...@yahoo.com To: John Woods jawood...@yahoo.ca; Experimental Film Discussion List frameworks@jonasmekasfilms.com Cc: frameworks@jonasmekasfilms.com frameworks@jonasmekasfilms.com Sent: Monday, October 10, 2011 10:01:25 PM Subject: Re: [Frameworks] JK printer settings for 8mm to 16mm blowup What camera are you using? Is it a bolex reflex? Can you see the image through viewfinder? And if so, is it in focus when youve sot your previous outoffocus attempts? Sent from my iPod On Oct 10, 2011, at 9:47 PM, John Woods jawood...@yahoo.ca wrote: Hi Frameworks, I'm at last attempting to do some Super 8 blowups to 16mm but am confounded at finding the right printer/lens/bellows configuration. I've attempted to do the setup recommended by JK at: http://www.jkcamera.com/digital_instr_.htm with no luck, I just get a blurry grey image. I'm using a 50mm lens and tube extensions on a K-103 model. If anyone has any tips or could share with me a workshop manual being used by your school/co-op it would be greatly appreciated! I've found a few official manuals online but none that go into detail about doing blowup work. Thank you. John hot ___n you've s FrameWorks mailing list FrameWorks@jonasmekasfilms.com https://mailman-mail5.webfaction.com/listinfo/frameworks ___ FrameWorks mailing list FrameWorks@jonasmekasfilms.com https://mailman-mail5.webfaction.com/listinfo/frameworks
Re: [Frameworks] JK printer settings for 8mm to 16mm blowup
I use a 50mm el nikkor and h16 rx4. With The distance for full frame film plane to lens mount is approx. 5.5 inches and distance of front on lens to film image is 3 to 3.5 inches. This is for full frame. Once I'm within this labelled full frame area for super8, i fine focus, of course using focus/camera adjusting knob (not lens knob) with lens completely open, then focus through bolex view finder. Once image in focus, I lock the knobs and stop down lens to proper f/stop. Usually range f/8 - 16 , which will provide larger depth of field. Sent from my iPod On Oct 10, 2011, at 9:47 PM, John Woods jawood...@yahoo.ca wrote: Hi Frameworks, I'm at last attempting to do some Super 8 blowups to 16mm but am confounded at finding the right printer/lens/bellows configuration. I've attempted to do the setup recommended by JK at: http://www.jkcamera.com/digital_instr_.htm with no luck, I just get a blurry grey image. I'm using a 50mm lens and tube extensions on a K-103 model. If anyone has any tips or could share with me a workshop manual being used by your school/co-op it would be greatly appreciated! I've found a few official manuals online but none that go into detail about doing blowup work. Thank you. John ___ FrameWorks mailing list FrameWorks@jonasmekasfilms.com https://mailman-mail5.webfaction.com/listinfo/frameworks ___ FrameWorks mailing list FrameWorks@jonasmekasfilms.com https://mailman-mail5.webfaction.com/listinfo/frameworks
Re: [Frameworks] JK printer settings for 8mm to 16mm blowup
What kind of a lens are you using? I believe the proper lens to use for optical printing is an enlarging lens. Camera lenses have different number and arrangement of optical elements. I have used a 50mm slr lens to blow up s8 to 16 and it required a ridiculous amount of extension tubes, like 200mm+, and it requires that you be like one millimeter away from the film strip, which is not practical if your using the jk's gate. If you are using a camera lens with bellows or extension tubes what you are doing conveniently falls into the realm of macrophotography. There are a variety of equations to figure out how much extension you need and what your focus distance is, some quick google-ing should present them. Simply put the farther away the lens from the film plane, the greater the magnification and the closer the focusing distance. Here is a link from the jk website describing the use of enlarging lenses, although I don't immediately understand it: http://www.jkcamera.com/digital_instr_.htm I have some old manuals, and educational material relating to the jk lying around somewhere, I will try to dig them up and see if I can find anything relevant to your predicament. In the meantime i would just get ridiculously close to the super 8 your trying to photograph. It will be elusive, the depth of field is so shallow that minor movements will send you back into the unfocused blurry world. -Eric Stewart On Oct 10, 2011, at 6:47 PM, John Woods jawood...@yahoo.ca jawood...@yahoo.ca wrote: Hi Frameworks, I'm at last attempting to do some Super 8 blowups to 16mm but am confounded at finding the right printer/lens/bellows configuration. I've attempted to do the setup recommended by JK at: http://www.jkcamera.com/digital_instr_.htmhttp://www.jkcamera.com/digital_instr_.htm http://www.jkcamera.com/digital_instr_.htm with no luck, I just get a blurry grey image. I'm using a 50mm lens and tube extensions on a K-103 model. If anyone has any tips or could share with me a workshop manual being used by your school/co-op it would be greatly appreciated! I've found a few official manuals online but none that go into detail about doing blowup work. Thank you. John ___ FrameWorks mailing list FrameWorks@jonasmekasfilms.comFrameWorks@jonasmekasfilms.com https://mailman-mail5.webfaction.com/listinfo/frameworks https://mailman-mail5.webfaction.com/listinfo/frameworks ___ FrameWorks mailing list FrameWorks@jonasmekasfilms.com https://mailman-mail5.webfaction.com/listinfo/frameworks
