This is the ninth in a series of posts on the Sony a9. The series starts here. There have been reports of Sony a9s shutting down because of internal temperature buildup. There are many camera modes that can affect power consumption, and I hope to eventually be able to do the fixturing to measure that… [Read More]
Search Results for: a7RII self heating
Sony a6300 — self heating
This is part of a long series of posts about the Sony a6300. The series starts here. The Sony a7RII and the a7II both have some self-heating issues when asked to make successive long exposures. The suspicion at the time was that the IBIS systems in both cameras provided some degree of thermal isolation and… [Read More]
Sony a7RII FW 2.0 raw dark-field mean values vs ISO
Jack Hogan, in a comment to an earlier post on the rms noise values of uncompressed and compressed Sony a7rII dark-field images, wondered if there was digital multiplication going on, and, if so, would the mean values be affected. I took a look at the mean values of a 200×200 central square of the same… [Read More]
Sony a7RII LENR at ISO 100
Yesterday we saw that the Sony a7RII long exposure noise reduction (LENR, aka dark-frame subtraction) is applied at shutter speeds so short that it hurts the engineering dynamic range of the image. That experiment was performed at ISO 3200. It just didn’t seem right that the Sony engineers would do something like that. To be… [Read More]
a7II self-heating for long exposures
In this post, we saw a pronounced self heating effect in the dark noise of successive 30-second exposures with the Sony a7RII. I repeated the test with the predecessor camera, the a7R, and found far less effect. A reader postulated that the difference might be lower thermal conductivity between the sensor and the camera chassis… [Read More]