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Message: <blockquote data-quote="alfaholic" data-source="post: 119846" data-attributes="member: 13066">Basically, ISO represents the sensitivity of the film in analog camera, and the sensor in your DSLR Nikon.In analog world that sensitivity depends of the chemicals used in film creation, so less sensitive film will give you better results in terms of noise and grain, but greater ISO values will give you better exposure at the cost of a greater noise and grain.It is almost the same in your digital camera, just you do not have the film anymore, you now have the sensor.Put your camera to Aperture Priority, shoot with ISO 100, and then the same thing with ISO HI2, then you will see the difference.As for self portrait, I think the best way to do it is to hire someone to handle the camera while you are there with the fish.If you still want to do it your self, then you need to select central focus point, and put your camera to the tripod.Find something to put in front of the camera and place it at the same place you will stay with the fish, so you can focus at the right distance.Then turn on 10s shutter release, move to the exact place where you putted the object for focusing, and wait.Yes, stones and sticks, but it will work. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" /></blockquote>