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<blockquote data-quote="J-see" data-source="post: 436457" data-attributes="member: 31330">I don't really get what you're asking.The f/8 focus ability of the later Nikons is the ability to focus lenses to which a TC is connected. How many focal points depends on the specific cam. For the D7100 it was solely the center one but for other cam's it's up to 11 focal points (If I remember well).Wider aperture lenses will use more points but you'd have to check how many which cam can use at what aperture.I just checked and for the d7100 it seems only the center focal point is compatible with lenses slower than f/5.6 up to f/8.<a href="http://imaging.nikon.com/lineup/dslr/d7100/features01.htm" target="_blank">Nikon | Imaging Products | Capturing power - Nikon D7100</a>The Tamron has an effective focus of f/5 to f/6.3 if my EXIF data is correct. I start to understand why you have more issues to focus the Tam than me.To add: I read somewhere some &quot;trick&quot; is being used to have the Tam focus on certain cams but I'd have to think hard and dig deep to find that article again. It does focus on my D3300 but the results are poor. I'd have to check the max ability to focus of that cam.</blockquote>

[QUOTE="J-see, post: 436457, member: 31330"] I don't really get what you're asking. The f/8 focus ability of the later Nikons is the ability to focus lenses to which a TC is connected. How many focal points depends on the specific cam. For the D7100 it was solely the center one but for other cam's it's up to 11 focal points (If I remember well). Wider aperture lenses will use more points but you'd have to check how many which cam can use at what aperture. I just checked and for the d7100 it seems only the center focal point is compatible with lenses slower than f/5.6 up to f/8. [URL="http://imaging.nikon.com/lineup/dslr/d7100/features01.htm"]Nikon | Imaging Products | Capturing power - Nikon D7100[/URL] The Tamron has an effective focus of f/5 to f/6.3 if my EXIF data is correct. I start to understand why you have more issues to focus the Tam than me. To add: I read somewhere some "trick" is being used to have the Tam focus on certain cams but I'd have to think hard and dig deep to find that article again. It does focus on my D3300 but the results are poor. I'd have to check the max ability to focus of that cam. [/QUOTE]

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