9/5/2023 0 Comments 7s 3 minutes to midnight![]() Per the usual Lonely Speck article, I’ll be concentrating almost exclusively on the low light capability of the a7S, particularly for landscape astrophotography. It should also be compatible with the soon-to-be-released production oriented Black Magic URSA HDMI. In order to record the full 3840 x 2160 UHD 4k video, you need to plug the a7S into a separate video recorder like the Atomos Shogun which will be available in late September. It can still record regular old HD video in 60i/60p/30p/24p at 1920 x 1080 and 120p at 1280 x 720 directly in the camera. This means that it’s not actually capable of shooting 4K unless you attach it to a portable external recorder. *The a7S is capable of outputting 4:2:2 UHD 4K video via its HDMI port. ISO 409600 is only really applicable to really really dark scenes and the photos are sure to be really noisy, but it also indicates that the other higher ISOs of the a7S should be much cleaner than the competition. Now for all practical purposes, 409600 is an ISO setting that’s probably not going to be used very much for final images, if at all, ever. The a7S goes a full two stops more: it has a maximum ISO of 409600. Most high end DSLRs’ ISO sensitivity tops out at or 51200 or 102400. This means that it should arguably be the best camera for astrophotography yet. This means that, all other things being equal, the A7s should be capable of the best per pixel signal-to-noise ratio of any production camera. The more light per pixel, the better the signal to noise ratio for that pixel and so that pixel will more accurately detect the incoming light than a smaller pixel would. The larger pixel size means that each pixel can collect physically more light. But even with a sensor resolution that is a third the resolution of the cheaper a7R, the a7S offers two things in return: sensitivity and 4K video (sort of*). The A7s has larger pixels than pretty much any consumer level full-frame digital camera. ![]() With the a7S, it seems like like you’re paying more for less. But with that 12.2 megapixel sensor comes some distinct advantages, especially for low-light photography and video. The recently released a7S seems like sort of the oddball of the three a7 variations: It has only a 12.2 megapixel sensor and at the time of this writing, it costs almost $1000 more than the a7 and $200 more than the much higher resolution a7R. First Sony released the 24.3 megapixel a7 and 36.4 megapixel a7R, the first mirrorless cameras with full-frame 24mm x 36mm sensors. The Sony a7S is the third variation of the full-frame mirrorless a7 series of cameras that Sony has recently released. With a full frame sensor and ISO 409600, is it the best low light camera out there? ![]() As soon as the Sony a7S was announced, I knew I had to try it for astrophotography.
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