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<blockquote data-quote="westmill" data-source="post: 60645" data-attributes="member: 9330">Ok I will do my best here. Firstly... the exposures are identical ! The differance between 100 ISO and 400 ISO IS exactly two stops, which the camera has compensated for precisely as the differance between 800 and 3200 is also exactly two stops. For best sharpness I would recomend stopping down to F8. As you move in close DOF gets narrower too.If you notice... the doff itself is very shallow here. You have actualy missed focus ! If you look to the right of the boulder, you will see the grassis out of focus. The grass in front of the boulder however is very sharp. The initial amount of DOF is not wide enough to cover the whole boulder even if you had caught it. A lot of the answer here is to stop down enough to give you your desired amount of doff. And obviously to make sureyou have correct focus on your subject. Thats about the best i can do for now, before i get brain freeze lolI hope that helps sumwhat though <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big grin&nbsp; &nbsp; :D" loading="lazy" data-shortname=":D" /></blockquote>

[QUOTE="westmill, post: 60645, member: 9330"] Ok I will do my best here. Firstly... the exposures are identical ! The differance between 100 ISO and 400 ISO IS exactly two stops, which the camera has compensated for precisely as the differance between 800 and 3200 is also exactly two stops. For best sharpness I would recomend stopping down to F8. As you move in close DOF gets narrower too. If you notice... the doff itself is very shallow here. You have actualy missed focus ! If you look to the right of the boulder, you will see the grass is out of focus. The grass in front of the boulder however is very sharp. The initial amount of DOF is not wide enough to cover the whole boulder even if you had caught it. A lot of the answer here is to stop down enough to give you your desired amount of doff. And obviously to make sure you have correct focus on your subject. Thats about the best i can do for now, before i get brain freeze lol I hope that helps sumwhat though :D [/QUOTE]

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