ICE BOX - Image Circle Evaluation from Duclos Lenses

ICEBOX-logoTesting 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. This has been a project I've been working on for a long time. With the help of our engineers and some back-end support from Phil Holland, I've finally been able to complete this tool. I'll be recording as many lenses as I can in my spare time (who am I kidding... I'm neck deep in lenses and have a one year old daughter) to provide the most usable, comprehensive database of image circles for the industry. [caption id="attachment_3211" align="aligncenter" width="800"]ICE Box The ICE Box test bench in it's early prototype form.[/caption] A bit of housekeeping here: I chose a 24x36mm maximum because it will easily demonstrate all of the relevant cinema formats including Micro 4/3, Super 35, Red Dragon, Vista Vision, and everything in between using the integrated scale. Sure there are larger cinema formats (IMAX, Alexa 65, etc.) but those are very specialized and lenses for larger formats are not common by any means. Because lenses are designed specifically for these larger formats, you know they'll work on those and anything smaller than the format they were designed for. [caption id="attachment_3213" align="aligncenter" width="2000"]ICEBOX---Angenieux-Optimo-25-250mm-wide A sample test result showing various formats as well as the manual diameter rule. As you can see, this brand new 25-250mm Angenieux Optimo Style lens will just barely clip the Red Dragon 6K frame on the wide end of the zoom.[/caption] I'll be adding my results continuously once I find a permanent home on the web. Check back for a link to that location soon. Feel free to share this post with anyone and everyone or even download the results from a specific lens test. I'm all about sharing knowledge. Enjoy!


Duclos Lenses takes great pride in their product designs, almost all of which are designed in-house. Manufacturing takes place either in-house, or in the hands of our trusted specialists including a range of professionals in the field of opto-mechanical manufacturing and aerospace fabrication. Products that bear our name represent the highest quality in the motion picture lens industry.



Duclos Lenses is committed to offering the best shopping experience possible. Check our price match details on our Terms & Conditions page.



This product qualifies for financing, either through the manufacturer or through one of our partner financing firms. Head on over to our financing details page today for additional information.



Duclos Lenses sets itself apart from the competition by actually knowing and understanding the products that we sell. We genuinely want all of our customers to receive the absolute best products possible. It's because of this that we offer two years of free basic maintenance with every new lens purchased from Duclos Lenses. Click here for more information.



Express shipping... for FREE!
Yes, free. This product will ship out Express by FedEx with full insurance and tracking at no additional charge. Applies to all domestic orders.



Duclos Lenses is committed to providing the best possible products to our customers. Unlike the competition, our technicians have the knowledge and tools to check every single lens that we offer. This happens once when new products arrive from the manufacture and once again before they ship out. This ensures that our customers are only receiving the best of the best. Yet another reason Duclos Lenses is the premier destination for motion picture lenses.