Prontor shutter repair


  • Copal Shutter Care & Alternatives
  • Franka Super Frankarette slow shutter speed regulator repair
  • US$9.99: Instruction for Repairing Prontor Shutters
  • Pronto, pronto … Prontor.
  • Prontor Shutters
  • Q & A: How to clean shutter?
  • Copal Shutter Care & Alternatives

    The evolution of chemicals, substrates and processing methods evolved separately from the mechanical designs of what started with the camera obscura. Copal, compared to prior and rival Compur and Prontor shutters are more accurate than the older shutters but still spring motor driven. Given the precise nature of modern cameras, the shutter speed markings on the barrel of a Copal shutter can be viewed more as targets of shutter speed and not absolutes.

    Centrally mounted shutters of size 0 were designed and constructed approximately 50 years ago for lens components that weigh anywhere from a few grams to a few grams and with a diameter of 15 mm to about 50 mm.

    New Rodenstock optics designed to resolve for megapixels and beyond, tip the scales at up to grams and can have diameters up to mm which correspondingly tug at the mounting threads, so proper handling is critical to the extended life of these lenses.

    In this particular case a shutter repair is not possible as essentially the body of the shutter has been deformed beyond repair. The image from such an impact would result in partial blur in some areas and a gradient blur over the half of the image. In a number of cases over the last years, our clients have been unaware of the event that caused the misalignment of their lenses, only finding out somewhere in the aftermath that a portion of their images were no longer as tack sharp as they used to be.

    We are at the end of the age of the Copal shutter, with Copal announcing mid that they would no longer be producing new units.

    We have no clear indication when the last new Copal-0 shutter will be available for a new lens or to be installed as a repair, so it is of significant importance that we care for and extend the lives of existing Copal-0 shutters already installed in our lenses as the available supply of new shutters for new lenses and repairs is dwindling.

    Think of this like shifting gears in a car without using the clutch. You can change gears, but the resulting wear on the transmission will ultimately cause early failure. The process should always be, set the shutter speed first, cock and then shoot. Lens should always travel without the spring tension of the shutter being cocked. Unless you have a laser cut foam case the cradles specifically that lens and your technical camera as a single unit, always travel with the lens detached from the camera.

    Aperture and use of the Diaphragm Lever are the only needed engagements with the mechanical system. Alternative to using the diaphragm lever is to use a lens cap. I actually love the ES workflow and prefer it in my shooting to using the Copal shutter at all. The pace of the rolling shutter is a little longer than one full second. Any objects of any size or speed moving through the frame will have a lean to them, as the top of the frame is being scanned before the bottom of the frame.

    With Copal Shutter or body exposures, this is done automatically at the conclusion of any given capture and normally, subsequent frames at the same shutter speed will not require a fresh reference file, as the original file will suit.

    With ES enabled on a technical camera, at the conclusion of the first exposure at any given shutter speed, the user will have to either securely place a lens cap on the lens, or close the shutter down via the diaphragm lever.

    Subsequent dark frame reference prompting can be mitigated by selecting to suppress it via a radio button on the ES interface. IIQ bit 1. In its newest iteration, it is fully battery powered and the box mounts easily to your tripod so as to function as easily on location as in the studio.

    I had the opportunity to shoot the Sinar eShutter mounted up to the Sinar LanTec for a few days and the eShutter, while not as simple as the purely electronic Phase ES, or purely mechanical Copal, it is a very nice system and with a little muscle memory could easily integrate into any photographers workflow. Dislikes: Any and all impediments to finding truth.

    Franka Super Frankarette slow shutter speed regulator repair

    This shutter operates directly from the cable release or release lever. This allows rapid repetition of exposures without touching the shutter between shots. This is analogous to the difference in operating a revolver by pulling the trigger to revolve the cylinder, cock the hammer, and release the firing pin A fair amount of finger energy is required to do this.

    As opposed to cocking the hammer in a separate operation then squeezing the trigger with minimal energy. Operation of Prontor professional shutter follows the self-cocking principle.

    They can be released without any previous cocking operation. This is of particular advantage when multiple exposures with or without flash are carried out. Release is possible by choice with either release lever 1 or by means of the cable release socket 2 colour code: red. For ground glass viewing shutter and diaphragm can be opened in separate steps via the cable release socket 3 colour code: white.

    These two operating steps of releasing and opening are carried out by means of the central remote control unit from behind the camera. This is true as well for the aperture 5 and 6. The click-stops can be disengaged—if desired—by lever The scales depend on the mounted lens. The aperture can be set either with the aperture setting handle 7 or with the aperture setting device which is inserted into support 8 and hole 9 of aperture setting handle 7, By means of this device the aperture can be controlled from the rear of the camera.

    The flash connection 10 is well protected and plug connections find firm hold. By adding the automatic cartridge accessory, the central remote control unit can be extended to a cartridge automatic if a camera is equipped with an appropriate connection to a cartridge holder. When inserting a film cartridge the shutter, which is usually open during ground glass viewing, closes automatically. The operature sic adapts to the pre-set value. The Prontor Professional line has several accessories to improve its versatility.

    The following pictures and product literature explain these. Click for Enlarged View Click for Enlarged View All currently made 0, 1, and 3 Copal makes two versions of the 3 are essentially interchangeable.

    The thread dimensions and mounting hole sizes are as in the table on the previous page There is also a table specific to the Prontor shutters at the bottom of this page — a lens which will fit a Copal 0 shutter will fit a Prontor Professional 01 for example.

    There may be some inconvenience such as around obtaining the right iris scale but we routinely accomplish these installations. Note that the 0 size is a modification of the 1 size. We do not service these shutters. Prontor Shutter Measurements.

    US$9.99: Instruction for Repairing Prontor Shutters

    For ground glass viewing shutter and diaphragm can be opened in separate steps via the cable release socket 3 colour code: white. These two operating steps of releasing and opening are carried out by means of the central remote control unit from behind the camera.

    This is true as well for the aperture 5 and 6.

    Pronto, pronto … Prontor.

    The click-stops can be disengaged—if desired—by lever The scales depend on the mounted lens. The aperture can be set either with the aperture setting handle 7 or with the aperture setting device which is inserted into support 8 and hole 9 of aperture setting handle 7, By means of this device the aperture can be controlled from the rear of the camera. The flash connection 10 is well protected and plug connections find firm hold. By adding the automatic cartridge accessory, the central remote control unit can be extended to a cartridge automatic if a camera is equipped with an appropriate connection to a cartridge holder.

    When inserting a film cartridge the shutter, which is usually open during ground glass viewing, closes automatically.

    Prontor Shutters

    The operature sic adapts to the pre-set value. The Prontor Professional line has several accessories to improve its versatility. The following pictures and product literature explain these. Click for Enlarged View Click for Enlarged View All currently made 0, 1, and 3 Copal makes two versions of the 3 are essentially interchangeable.

    Q & A: How to clean shutter?

    In general then, based on my experience, is the obvious conclusion that the Prontors are more reliable than Synchro-Compurs, AND, if a Prontor needs service it does not a complete stripdown as a Synchro-Compur does. In general, the Compur is the most reliable of the trio and the Compur-Rapid is second. One last point about the Compur-Rapid and the Synchro-Compur. Well, both shutters achieve the hypothetical highest speed with the addition of a booster spring. Think of it as drawing a bow.

    In storage, shutters should be left uncocked, and on one second speed. It is best not to leave the lenses in areas of high heat, which can cause lubricants to run. In use, shutters work best in near room temperatures. During cold weather, try to keep your equipment warm.


    thoughts on “Prontor shutter repair

    • 15.08.2021 at 02:03
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    • 21.08.2021 at 08:39
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