Eric Soto Posted January 15, 2018 Share Posted January 15, 2018 Hey everyone, what are the benefits of shooting open gate on a camera like the Alexa XT ? Thanks. Link to comment Share on other sites More sharing options...
Stuart Brereton Posted January 15, 2018 Share Posted January 15, 2018 Increased resolution. Link to comment Share on other sites More sharing options...
Eric Soto Posted January 15, 2018 Author Share Posted January 15, 2018 Increased resolution. What would be the reason not to always shoot open gate then ? Link to comment Share on other sites More sharing options...
Stuart Brereton Posted January 15, 2018 Share Posted January 15, 2018 Shooting open gate can cause problems with certain lens's image circle not covering the entire sensor area. Link to comment Share on other sites More sharing options...
Eric Soto Posted January 15, 2018 Author Share Posted January 15, 2018 Shooting open gate can cause problems with certain lens's image circle not covering the entire sensor area. I see. ok. Thanks. Link to comment Share on other sites More sharing options...
Premium Member David Mullen ASC Posted January 16, 2018 Premium Member Share Posted January 16, 2018 Keep in mind that Open Gate is a 1.55 : 1 aspect ratio, so there is no advantage if you are shooting with anamorphic lenses, for example, or want a 4:3 image. Close to 3.4K Open Gate ARRIRAW is 3.2K ProRes on the Alexa. Either would upsample to 3.8K UHD or 4K for a DCP well. Link to comment Share on other sites More sharing options...
Eric Soto Posted January 16, 2018 Author Share Posted January 16, 2018 (edited) Keep in mind that Open Gate is a 1.55 : 1 aspect ratio, so there is no advantage if you are shooting with anamorphic lenses, for example, or want a 4:3 image. Close to 3.4K Open Gate ARRIRAW is 3.2K ProRes on the Alexa. Either would upsample to 3.8K UHD or 4K for a DCP well. I apologise if this may seem redundant for you, but could expand on why there would be no advantage to shooting on anamorphic lenses in Open Gate ? Would it be because the anamorphic lenses have a stretch of 2:1, and would therefore not use the full open gate resolution? Edited January 16, 2018 by Eric Soto Link to comment Share on other sites More sharing options...
Premium Member David Mullen ASC Posted January 16, 2018 Premium Member Share Posted January 16, 2018 If you are shooting with 2X anamorphic lenses for a final unsqueezed image with a 2.40 : 1 aspect ratio, that means you are using an area of the sensor that is 1.20 : 1 (6:5) with an image with a 2X optical horizontal squeeze. So if you have a 4:3 Alexa and you switch to recording Open Gate, you are gaining more side information of the sensor but not really more height of the sensor. You don't really need that extra info on the sides since you are going to end up cropping to a 1.20 : 1 area. You can see here that Open Gate and 2.40 anamorphic share the same sensor height: Link to comment Share on other sites More sharing options...
Eric Soto Posted January 16, 2018 Author Share Posted January 16, 2018 If you are shooting with 2X anamorphic lenses for a final unsqueezed image with a 2.40 : 1 aspect ratio, that means you are using an area of the sensor that is 1.20 : 1 (6:5) with an image with a 2X optical horizontal squeeze. So if you have a 4:3 Alexa and you switch to recording Open Gate, you are gaining more side information of the sensor but not really more height of the sensor. You don't really need that extra info on the sides since you are going to end up cropping to a 1.20 : 1 area. You can see here that Open Gate and 2.40 anamorphic share the same sensor height: Great. Thank you. Link to comment Share on other sites More sharing options...
Eric Soto Posted January 16, 2018 Author Share Posted January 16, 2018 If you are shooting with 2X anamorphic lenses for a final unsqueezed image with a 2.40 : 1 aspect ratio, that means you are using an area of the sensor that is 1.20 : 1 (6:5) with an image with a 2X optical horizontal squeeze. So if you have a 4:3 Alexa and you switch to recording Open Gate, you are gaining more side information of the sensor but not really more height of the sensor. You don't really need that extra info on the sides since you are going to end up cropping to a 1.20 : 1 area. You can see here that Open Gate and 2.40 anamorphic share the same sensor height: So I looked this over and I fully understand what you mean now, but one question unrelated to open gate but to this page you sent. What is the difference between Arri 2.39 Flat and Arri 2.39 Scope 2x ? I thought that flat refers to 1.78- 1.85 ? Thanks Link to comment Share on other sites More sharing options...
Stuart Brereton Posted January 16, 2018 Share Posted January 16, 2018 Flat refers to shooting with spherical lenses, as opposed to anamorphic lenses. Flat 2.39:1 is derived by cropping the sensor to that aspect ratio. Scope 2.39:1 is anamorphic. Link to comment Share on other sites More sharing options...
Eric Soto Posted January 16, 2018 Author Share Posted January 16, 2018 Flat refers to shooting with spherical lenses, as opposed to anamorphic lenses. Flat 2.39:1 is derived by cropping the sensor to that aspect ratio. Scope 2.39:1 is anamorphic OK I see. Thank you. Link to comment Share on other sites More sharing options...
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