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Helpful Q&A's for our customers
Are your lenses good enough for that 4k high definition camera?
There are a lot of claims on the camera side that the resolution is so high, the lenses are now the weaker link and dictate the maximum resolution of the produced image. But check this out: even with a resolution of 50 line pair per millimeter your lens beats a 4k video camera by a comfortable margin. Download the complete paper on this topic.
Cooke S4 (/i) 100mm Rear Glass Replacement: Which way does the glass go in the lens?
This information is for qualified technicians only; do not attempt the replacement if you do not have experience in handling the glass properly. “For the Cooke S4 (/i) 100mm the glass part number is 99-1492, it has a flat side facing the film plane and a convex curve toward the front of the lens.” One word of caution, the third glass from the rear is a thick element held by a very fragile thin glass flange. Refrain from disturbing any more glass and limit your repair to the rear element only.
Cooke S4 Prime Lenses: What is the Field of View for a 2.40 Aspect Ratio?
Is there a Service Drawing for the Cooke S4 Prime Lenses?
The outer body on most of the Cooke S4 prime lenses is built the same. Attached is a drawing and a part list of the outer body components
Cooke S4 (/i) 25mm Front Glass Replacement: Which way does the glass go in the lens?
This information is for qualified technicians only; do not attempt the replacement if you do not have experience in handling the glass properly. For the Cooke S4 (/i) 25mm, the front glass part number is 99-1476. It has a shallow convex curve facing to the outside and a steeper convex curve toward the film plane.
Cooke S4 (/i) 32mm Front Glass Replacement: Which way does the glass go in the lens?
This information is for qualified technicians only; do not attempt the replacement if you do not have experience in handling the glass properly. This one is easy, the glass is symmetrical so it does not matter which way you put a replacement glass. However it is always a good practice to keep the glass in the same position as it originally was when the lens is serviced. A small pencil mark on the very edge may be needed to keep track of the relative position.
What is the latest version of the /i viewer?
Check out the latest /i viewer version, it is V3 for your PC or MAC. You find it at: http://www.cookeoptics.com/cooke.nsf/technical/downloads.html
With this software and the serial cable (part number 472-8443) you can display the lens information on your PC without being connected to a camera..
What is included in the Cooke 9-50 CVK to Super 16 Conversion Kit?
The Super 16 conversion kit is a small external optical adaptor that mounts on the rear of the lens, inside the existing mount. It includes the optical cell, a spacer to be placed under the existing mount, a zoom and iris scales, plus the screws needed to mount the unit.,What are not included are extra shims needed to make the fine adjustment of the back focus after the conversion.,This is a semi-permanent modification as it can be easily removed and the lens returned to its original format. However the iris and zoom scales will probably be damaged in the process and may need to be replaced next time the lens is converted back to S16.
What are the angle of view of the standard 3D rig
Cooke as wide as 27mm,Ultraprime as wide as 24mm,P+S C mount lenses as wide as 12mm,Digiprimes as wide as 7mm.
Tiffen Hot mirror, when do you need this series of filters?
The hot mirror is specially designed for cameras that do not have a built-in infrared filter. Cameras with 3 CCD or 3 CMOS sensors do not need this filter as the prism system effectively filters out the infrared wave lengths. Only cameras with single chip and without infrared cutoff filter built in will benefit from this series of filters. Different materials reflect infrared wavelengths in different amounts, creating an unnatural color shift in the objects with most infrared reflection. The filter removes those infrared reflections and restores the natural colors as seen by the human eye.
What are the current TSA rules concerning transport of batteries?
Considered a Class 9 Hazardous Transport, as with all lithium and lithium ion batteries, Dionic 160 must be transported in accordance with IATA, IACO and 49CFR regulations regarding classification of lithium and lithium ion transportation. Equivalent lithium content of Dionic 160 is greater than 8 grams and must be transported as Class 9 Hazardous Goods. Shipping companies typically charge additional fees for Class 9. Download the TSA guidelines here.
How do you use the MC bar on the Putora charts?
The MC are based on cycles or line pairs (one black and one white line). It was originally designed for the 2/3" broadcast format that is with horizontal line of 8.8mm across the sensor.,The 2/3" camera has to be placed so the two arrows on the ends of the MC bar are just outside of the frame without cutting in the MC bar. Setup this way the MC 1 represents 80 cycles, if it filled the entire line you would have 80 pairs of black and white lines and you would need a minimum of 160 horizontal TV lines to resolve this pattern. MC2 is 160 cycles and 320 horizontal TV lines,and so on to MC12 with 960 cycles and 1920 horizontal TV lines. If you need a value in line pairs per millimeter, 80 cycles / by 8.8 gives us 9 lp/mm for MC1, 18.2 lp/mm for MC2, 27.3 lp/mm for MC3, 36.4 lp/mm for MC 4, 45.5 lp/mm for MC5, 54.5 lp/mm for MC6, 63.6 lp/mm for MC7, 72.7 lp/mm for MC8, 81.8 lp/mm for MC9, 90.9 lp/mm for MC10, 100 lp/mm for MC11, 109 lp/mm for MC12, Again theses values are valid for a 2/3" camera setup as described above.,If your sensor is of a different size and you fill the screen with the MC bar, a corrective factor has to be applied.