Testing the image circle of a lens is rather simple with a test projector but it can be somewhat subjective. There isn’t always a clearly defined hard end to an image when evaluating for coverage. Sometimes a little bit of light falloff is acceptable. A natural vignette can be pleasing but it can also blend into the limit of a lens’ image and make determining maximum coverage rather difficult. I’ve spent years compiling a list of image circles based on my own subjective opinion which was met with great thanks by most – but there has always been the inevitable email or phone call from a disgruntled cinematographer who was disappointed to find that a lens clipped a fraction of a millimeter into the frame of their image despite my records. There are variables, of course, in any analog assessment such as this. Because of this, Duclos Lenses has developed a tool that records the image circle of any lens, saving a reference image for individuals such as yourself to determine to what degree the light falloff is acceptable. Continue reading ICE BOX – Image Circle Evaluation from Duclos Lenses
Tired of guessing which lenses will and won’t cover a specific sensor? Stress no more, I’ve revised the Image Circle Database that so many of you have been asking for. It’s an ongoing project that I update periodically as lenses come through the shop (there’s a lot of them). With the rate that manufacturers are designing and releasing new lenses, this database will be updated as a downloadable PDF often. If there is a specific lens you would like researched for image circle, please list it below in the comments. The Database is going to stick to primarily cinema lenses or at least those used for cinema often. Check out the details below. Continue reading The Image Circle Database Is Back!