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--- blog:photography:night:2021_09_19 [2021/09/20 08:57] – john
+++ blog:photography:night:2021_09_19 [2021/09/20 09:59] (current) – john
@@ Line 20: / Line 20: @@
 ==== Images ====
+These first three images are tests of different exposure lengths, all at the same 800 ISO setting. At 20 seconds the image is relatively clear (though with a relatively modest amount of noise, as expected with a single exposure) with most objects in the centre of the image being well defined and without trails (objects located in the corners will always be slightly elongated on this wide-angle lens):
 <imgcaption 1|20s, ISO 800, Processed RAW>{{:blog:photography:night:2021_09_19:img_3208.jpg?650|}}</imgcaption> <imgcaption 1|20s, ISO 800, Unprocessed JPEG>{{:blog:photography:night:2021_09_19:img_3208_raw.jpg?650|}}</imgcaption>
-s, ISO 800
+At 25 seconds a moderate amount of objects are starting to elongate slightly:
-{{:blog:photography:night:2021_09_19:img_3209.jpg?400|}}{{:blog:photography:night:2021_09_19:img_3209_raw.jpg?400|}}
-s, ISO 800
+<imgcaption 1|25s, ISO 800, Processed RAW>{{:blog:photography:night:2021_09_19:img_3209.jpg?650|}}</imgcaption> <imgcaption 1|25s, ISO 800, Unprocessed JPEG>{{:blog:photography:night:2021_09_19:img_3209_raw.jpg?650|}}</imgcaption>
-{{:blog:photography:night:2021_09_19:img_3210.jpg?400|}}{{:blog:photography:night:2021_09_19:img_3210_raw.jpg?400|}}
-{{:blog:photography:night:2021_09_19:img_3222.jpg?400|}}{{:blog:photography:night:2021_09_19:img_3222_raw.jpg?400|}}
+At 30 seconds, I start to get very distinct stair trails forming but quite a significant increase in the number of stars:
+<imgcaption 1|30s, ISO 800, Processed RAW>{{:blog:photography:night:2021_09_19:img_3210.jpg?650|}}</imgcaption> <imgcaption 1|30s, ISO 800, Unprocessed JPEG>{{:blog:photography:night:2021_09_19:img_3210_raw.jpg?650|}}</imgcaption>
+Looking back in an Easterly direction over our house, showing quite a clear starfield with just a tiny few wisps of cloud:
+<imgcaption 1|20s, ISO 1600, Processed RAW>{{:blog:photography:night:2021_09_19:img_3222.jpg?650|}}</imgcaption> <imgcaption 1|20s, ISO 1600, Unprocessed JPEG>{{:blog:photography:night:2021_09_19:img_3222_raw.jpg?650|}}</imgcaption>
+**Observation:** //If I want to get more detailed starfield images, then I'm going to have to invest in a star tracker - clearly 25-30 second exposures are just long enough to start forming elongated objects even with my ultra-wide angle Tokina lens. 20 seconds appears to be the sweet spot whilst stationary.//