![]() They give the effective f-stop rather than an focal length divided by diameter number. Or rather, of how much light actually passes through a lens. T-values were/are actual tested values of lenses that are not perfect. Not over the top, because the difference between transmission and what an f-number suggested about the same was great enough. IMO a bit OTT unless the shutter and film stock/sensor are equally well calibrated.Ĭonfusingly, Zeiss marked some of its lenses with a red T or T*, which just indicated the lens was AR coated. T numbers take the absorbtion/scatter of a lens into account and give the f-number of a perfect lens that would give the equivalent light transmission and exposure. Completely different from 'T-numbers' = T for Transmission. You're thinking of 'Waterhouse stops' Tony. What was so special about a near circular aperture? And what about enlarging lenses, where out of focus rendering seems totally irrelevant? Some of those had multiple blades too. They must have been very expensive and labour intensive to make. It occurred to me to wonder why they were made with so many blades, at a time when (as far as I remember) no-one cared a toss about Bokeh. For example the 300mm Tair, which came with the Photosniper set, had 16 blades which closed down automatically, but needed to be opened back up again manually Pretty much all lenses with more than 9 blades were plain manual or preset, and non-automatic, although some semi-automatic lenses had more. The Pentacon 135 and 200mm Meyer Optic designed telephotos having 15 blade preset apertures are a good example. ![]() Try to enlighten.I know from selling on the auction site that lenses with multiple blade "near circular" apertures are in some demand due to their perceived effect on the out of focus areas - the so called "Creamy Bokeh". In this spirit we encourage detailed and insightful posts, comments, and discussions on the Cinema Arts. This is a place to learn from and share with professionals. Professionals and amateurs alike unite to discuss the world of filmmaking. r/Filmmakers is a place to meet, share work, tips, tutorials, and experiences in the field. ![]() Piracy or advocacy of piracy is not toleratedįollow us on Twitter or join the Reddit Filmmakers Network on Facebook. No Travel Videos or V-Log videos are allowed. Please remember that simply posting your film or page for views or subscriptions is not allowed. For example, you can detail lighting setups, explain how a particularly complex shot was achieved, or go over any setbacks that hit production and what you did to overcome them.Īll submission statements must be at least 100 characters in length and be submitted within 30 minutes of submitting your post. Outline your involvement in the project and provide some insight on how it was made. If sharing your work and not seeking advice, your post must serve an educational purpose for the rest of the community. It may also help if you provide some of your own thoughts on your work, such as what you see as your strengths or areas of improvement and why. There are many aspects to filmmaking, so specifying what you want people to focus on will get you better results than simply asking for general feedback. If you are seeking advice or feedback, explain what it is you need help with, whether that's lighting, cinematography, audio, editing, or something else entirely. If submitting a film, trailer, or other creative content, you must select the "FILM" flair and include a submission statement (a comment on your post) elaborating on the following:
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