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<blockquote data-quote="Pierro" data-source="post: 57909" data-attributes="member: 8517">I'll be receiving a D300 very soon, and was wondering about this feature, as my D2x doesnt have it, so its new to me. I'm not expecting trouble,but merely curious about how the camera deals with certain lenses.For instance, primes would take up one lens place in the menu, and presumably, if you then add a teleconverter, you would need to check focus and treatit as a seperate lens, and would therefore take up one more spot in the menu ?&nbsp; So one prime tele lens becomes 2 different lenses ?Moving on to zooms, i read that zooms need to be checked at minimum and maximum zoom, taking up another 2 lenses in the menu. Ok, that sounds good, but what happens when you have, say a 50 to 100 zoom, you correct focusing at both 50 and 100 and you get them bang on, but one fine day you decideto use 75mm ... does the camera decide that it wasnt calibrated for 75mm and therefore if you had any previous B/F focus problems at this FL, you will still get them ?And what about 40mm.. or 90mm and so on. ?Also, when mounting any of your arsenal of corrected lenses, do you have to enable them every time in the menu, or does the camera immediately remember each and every lens and FL automatically ?Thanks !</blockquote>

[QUOTE="Pierro, post: 57909, member: 8517"] I'll be receiving a D300 very soon, and was wondering about this feature, as my D2x doesnt have it, so its new to me. I'm not expecting trouble, but merely curious about how the camera deals with certain lenses. For instance, primes would take up one lens place in the menu, and presumably, if you then add a teleconverter, you would need to check focus and treat it as a seperate lens, and would therefore take up one more spot in the menu ? So one prime tele lens becomes 2 different lenses ? Moving on to zooms, i read that zooms need to be checked at minimum and maximum zoom, taking up another 2 lenses in the menu. Ok, that sounds good, but what happens when you have, say a 50 to 100 zoom, you correct focusing at both 50 and 100 and you get them bang on, but one fine day you decide to use 75mm ... does the camera decide that it wasnt calibrated for 75mm and therefore if you had any previous B/F focus problems at this FL, you will still get them ? And what about 40mm.. or 90mm and so on. ? Also, when mounting any of your arsenal of corrected lenses, do you have to enable them every time in the menu, or does the camera immediately remember each and every lens and FL automatically ? Thanks ! [/QUOTE]

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