Sony 相機 破解限制+ a7 吃星點問題

[peter]

https://www.dpreview.com/forums/post/60638274

There seems to be a workaround to avoid the Star Eater issue on the Sony alpha camera's. Setting it to continues-Hi shooting mode should avoid the star eater algoritm from kicking in after 3/4sec....although, setting the camera into bulb seems to be a no-go since star eater is a plied again.

I personally think that the Star Eater issue is made bigger then it really is. Of course it's a pity that Sony implemented this feature, but most of us astrophotographers wouldn't even notice some stars were eaten in their image. Take for intance the image below, which was shot with a Sony A7R2 at ISO1600 and 60minute subs (90 of them to be exact).....there are probably stars eaten, but I can't see them because I don't even know they were there in the first place.....get my point?

So just go out, take the shots you like to take, and share your results here.

Just my 2 cents.

[peter]

https://www.lonelyspeck.com/how-to-fix-sony-star-eater-on-the-a7sii-and-a7rii-continuous-shutter-mode-workaround/

https://www.facebook.com/photo.php?fbid=1733910746628967&set=gm.1663276577062499&type=3&theater

B 快門模式下不能用連續快門

[peter]

https://www.sonyalpharumors.com/sony-solved-the-star-eating-issue-with-the-new-a7iii/

UPDATE: Jim Kasson has just started testing the A7III spatial filtering. And while there is no final conclusion yet it looks like the A7III may has not fixed this issue once and for all:

    There was a recent posting to the effect that the spatial filtering (aka “Star Eater”) present in many a7x cameras and firmware releases at shutter speeds of longer than 3.2 seconds has been “fixed” in the a7III. The spatial filtering is different, but it has not disappeared.

This means we have to hold off and wait until Jim has made the complete testing.

[peter]

MOBILE01 討論
https://www.mobile01.com/topicdetail.php?f=254&t=5227618&p=6

會吵這問題主要是舊版的韌體並不會出現這現象，
結果為了修正熱躁點的問題，更新之後才產生，
然後一開始好像只有特定模式才會出現這現象

[peter]

https://amazingsky.net/2018/05/31/testing-the-sony-a7iii-for-astrophotography/

a7III long-exposure spatial filtering
https://blog.kasson.com/a7iii/a7iii-long-exposure-spatial-filtering/

[peter]

https://petapixel.com/2018/06/08/sonys-star-eater-problem-has-been-defeated-in-the-a7-iii/

[peter]

https://www.facebook.com/photo.php?fbid=2585239824823192&set=p.2585239824823192&type=3&theater&ifg=1

[peter]

http://www.markshelley.co.uk/Astronomy/SonyA7S/sonystareater_v2.html

[peter]

https://www.facebook.com/photo.php?fbid=2585336204813554&set=p.2585336204813554&type=3&theater
APM107/700 
Tomas Yiu 

A7 v1.01 5分鐘



sony A7 某些板可不吃星

[peter]

https://www.facebook.com/photo.php?fbid=1202833519865180&set=a.108084352673441&type=3&theater

[peter]

A7 III   see S&T 2019 apr   

[peter]

https://www.fredmiranda.com/forum/topic/1530584/0

[peter]

https://www.dpreview.com/forums/post/61991833

https://www.dpreview.com/forums/post/59675364

[peter]

https://petapixel.com/2019/09/16/sony-a7r-iv-is-still-a-star-eater-after-a-certain-shutter-speed-report/

Sony a7R IV is Still a ‘Star Eater’ After a Certain Shutter Speed: Report

[peter]

https://www.dcfever.com/news/readnews.php?id=26064

Sony Alpha Rumors 網站報道了一則「壞消息」：Sony 最新推出的 A7R IV 依舊存有「吃星點」的問題，而且情況更有輕微惡化，叫一眾星攝之友大感失望。  該網站引述博客 Jim Kasson 的測試結果，他發現 Sony A7R IV 的內置雜訊移除功能在 3.2 秒快門速度之下便會強制介入，執行移除雜訊的任務。對比前代 A7R III，內置雜訊移除功能的強制介入快門速度是 4 秒。

以目前的技術而言，相機仍然未能有效地分辨雜訊與微弱的星星（後者在相片上可能只有一粒像素的大小）。大家可以想像到，在長曝光之下，當內置雜訊移除功能強制介入時，肯定會把一些本是星星的光點看作噪訊，除之而後快！星攝愛好者將相機錯誤地把星星移除的問題，稱作「吃星點」（Star Eater）。

因此，Kasson 建議廠方應棄用強制介入的設計，改為讓用家自行決定是否使用內置雜訊移除功能，以避免相機變成「星星吞食者」。