Thread: Atlas Lens Co. - Orion Series 2X Anamorphic Prime Lenses

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  1. #861  
    Senior Member rand thompson's Avatar
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    CST - Brand Video





    By Michael Steel







    This was filmed across one day inside a CST warehouse using an Arri mini camera and Atlas Orion anamorphic prime lenses. Directed by Gene Alberts for Odyssey Films.
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  2. #862  
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    Quote Originally Posted by rand thompson View Post
    Here's the 40,50 and 65 at f2 and f2.8 with LF Extender with a little color correction added to kind of get rid of that yellowish color cast.
    Thanks for this, is quite usefull. I forgot about the LF extender, there are no alternatives I presume. As I was even saving up to 1 atlas orion lens, now the reach has become so much further. So like on the ZCam F6 or panasonic S1H I still would need the LF extender. Even if it is EF mount right? So prolly gonna stick with the pocket 4K or 6K
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  3. #863  
    Senior Member rand thompson's Avatar
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    Thanks Joe




    These are some great samples from Dan that gave me a better understanding of what the LF extender does for the Atlas Anamorphic lenses.
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  4. #864  
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    Hi Joe,

    The photos are sort of a precursor to helping understand anamorphic aspect ratios more deeply.

    To be brief:

    Often (but not always)

    “Open gate” full sensor read out on LF/FF(36x24) sensors is by default 3:2 aspect ratio. With a 2x anamorphic coefficient this becomes 6:2 (or 3:1) - three times wider than it is tall. Delivery for anamorphic widescreen can, but does not need to be 2.40:1 (2.4 times wider than tall), 2.39:1, 2.35:1 or , really, whatever you want it to be for a deliverable, Netflix decided on 2:1 for instance as it’s a “universal” format proposed by a long time by some people, both creative and clever.

    I’m a traditionalist in only a few ways, so I like between 2.40:1 and 2.35:1 often.

    The long story short here is, if a sensor offers a native 6:5 or 4:3 mode as Red does (thanks Red) then you can easily go straight to delivery without any significant “framing plan” involving frame lines on a monitor and what I prefer to call extraction , but some people call “crop”

    Now, I happen to know that many cameras like the S1H, Blackmagics, and Kinefinity and Zcam offer multiformat options which allow you to shoot at 6:5 or 4:3 aspects to simplify your deliverable, so, because Atlas are traditional anamorphic format lenses they offer a tall imaging area - actually generally tall enough for a 2.40:1 delivery if extracted from shots on a (+/- ~36x~24mm) full frame sensor showing corner darkening / vignette on the outer sides of an (+/-~)3:1 aspect desqueezed image. I’ll post to directly resized to 2.40:1/2.39:1 images later today after I get a few other things done so you can see the direct effect.

    For your purpose, I would recommend the 40/50 or 65 - which is why I chose those three to shoot for the moment.

    The EF mount has nothing to do with the format size. In fact my best advice is to stay in PL as it gives you the most options for mirrorless adaptability including upcoming Red Komodo, as well as LF Extender, which we won’t offer with EF. It’s nice we offer EF, but unless you’re absolutely married to a Canon C series camera or Canon EF DSLR, PL is a better choice for literally any contemporary cinema camera user.

    Please forgive any typos as I’m doing this from my phone and just woke up pretty much ;)

    In general, my conclusion is you don’t _need_ the LF Extender especially if you’re just starting with one lens, even on a “full frame “ camera, you can do a LOT with any of those three on a full frame sensor, just by selecting an aspect mode on the camera that directly gives you the delivery aspect that fits your needs, or by using frame guides while filming and setting a deliverable frame in your post software.

    This is a great year to be camera fluid as we are spoiled for choice and they just keep coming.
    Last edited by Dan Kanes; 09-04-2019 at 07:54 AM.
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  5. #865  
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    Dan, confused a bit by the coverage explanation. On your site you state coverage for all your lenses is 31mm which covers the Arri Alexa sensor. That sensor is S35 so how can the lenses cover a full frame camera like a A7S or S1H? Forgive me if I've got mixed up here.
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  6. #866  
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    I can understand your confusion Ash.

    It’s complex, but after a while it becomes less complex to understand.

    31.11 is the diagonal dimension of 24.89x18.66 calculated through Pythagorean Theorem (a^2+b^2=c^2) which is the fastest shorthand way of showing an “image circle.” For a given format.

    Orion Series lenses are designed for a 24.89x18.66 imaging area.

    This represents a 4:3 (1.33:1) aspect ratio.

    The key is first acceptance and recognition that there are multiple formats within a given imager if a camera manufacturer allows this. Red is one of the best examples of multiformat imager dimensioning, offering extreme granular control over resolution and dimensional definition of a capture format. Anything smaller than the max resolution / aspect ratio is a crop or extraction from the overall sensor. Generally this is a good thing, unless you’re someone who wants in camera 2K/4K downsampling - which Red also does now, but still has many format options which can or cannot be the full edge to edge sensor , depending on your choice.

    With freedom of choice comes difficulties and responsibilities. I welcome this freedom and I also welcome the opportunity to be a steward of advancement in capabilities, growth and knowledge. Growth sometimes has pain, but I relish the chance to push through it.

    There is actually coverage our lenses can provide outside the de facto 24.89x18.66 design area. (Aka , bigger illumination area - I say area not circle because it’s an oval because they’re anamorphic).

    Now, to be clear they do not cover a 36x24 sensor edge to edge, in fact you can take a look at the images I provided taken on a ~36x24 sensor and see exactly where the vignette starts and ends without the LF Extender in place.

    Now, unless you’re delivering a 3:1 aspect ratio project , you don’t/shouldn’t care if you’re cropping / extracting because either your camera is doing that work for you, or someone doing post production is.

    If you’re shooting 8K 6:5 Monstro for a 2.40:1 wide screen deliverable, the camera is doing it for you.

    “Now wait a minute - they didn’t do that in the good old days of film !”

    Well, actually , that’s a misconception, and the express purpose of framing charts. Rarely would a deliverable in film days be “open gate - edge to edge everything. So, people developed ways of communicating frame lines through framing chartsc nomenclature like common top, etc. as there were deliverables for TV, deliverables for 1.85:1 theatrical, and later deliveries for 16:9 TV, etc. etc. on and on.

    Phil Holland made a great tool called “format compare” - super super useful for thinking of format sizes.

    Again, after I eat lunch I’ll show you three 2.35:1 deliverables from 40/50/65 lenses without the LF Extender, On a 36x24 “full frame” sensor.

    You’re welcome to always ask these kind of questions, as it’s important. I’ll confinue to round it out with more case study data, and we will have a super sweet media drop eventually with some useful ways of perceiving all this.
    Last edited by Dan Kanes; 09-04-2019 at 12:37 PM.
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  7. #867  
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    Fantastic, thanks for the info.
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  8. #868  
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    Here is a folder of images - the ones with the vignette are "open gate" ~36x24mm A7S sensor.

    There are ones that end in 235 - these are with a 2.35:1 extraction using full height of the sensor.

    There are also two other 40mm with their resolution noted at the end which are smaller 2.35:1 extractions showing various levels of vignette/frame size but still over "4k" deliverable resolution.

    https://drive.google.com/open?id=1Y0...RKboZ2nAOA7C-C
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  9. #869  
    Senior Member rand thompson's Avatar
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    Chante Moore - “Fresh Love”





    By CreativeDuet









    Official music video for Chante Moore's "Fresh Love".
    Director // Michael Vaughn Hernandez (instagram.com/creativeduet)
    Director of Photography // Brian M. Tang // (instagram.com/b_tang)
    Gaffer // Matt Burke // (instagram.com/burkewurke)
    Shot on Arri Alexa Mini + Atlas Orion Anamorphic Lenses
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  10. #870  
    Senior Member rand thompson's Avatar
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    I will use Dan's Terminology and grade from the previous page






    40mm f2.8-"open gate" ~36x24mm A7S sensor.





    40mm f2.8-2.35:1 extraction using full height of the sensor





    50mm f2.8-"open gate" ~36x24mm A7S sensor.





    50mm f2.8-2.35:1 extraction using full height of the sensor





    65mm f2.8-"open gate" ~36x24mm A7S sensor.





    65mm f2.8-2.35:1 extraction using full height of the sensor


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