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Message: <blockquote data-quote="bpchia" data-source="post: 303121" data-attributes="member: 24838">Thanks for all the replies, looks like I chose the right forum!  I thought as much in terms of needing to learn over time when people are at different focal lengths what the maximum aperture is needed to keep all in focus...I noticed that I was incorrect in saying the MINIMUM aperture because I was thinking of the aperture F number rather than how wide open the aperture is...I am curious about the apps people have talked about and how this would help you choose aperture in the situation I described, over and above just testing different apertures and looking at the photo in camera then zooming in to check each face is in focus (although I find sometimes the resolution of the in camera monitor makes it difficult to tell if something really is in focus).I just purchased the WU-1b wireless adaptor but have yet to test it with my iPhone.  If you use an iPad with the WU-1b does this provide a better "live view" that would allow you to make aperture changes in real time and see if this brings faces at different focal lengths into focus?Finally, when using the DOF preview button, the viewfinder gets darker and if you are not close up (eg 3-4 people in frame) it can be hard to manually focus...the situation I am having at the moment is I've just had my first child and he is often lower or in a differernt plane to the family and friends holding him, but often in low light so I want to use as large an aperture as possible.While I'm here, I'm finding that my D600/Tamrom combination finds it difficult to autofocus up close, particularly in low light, and I have to switch to manual focus.  Is this normal or could either component have a problem?Thanks again, great forum!</blockquote>

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