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<blockquote data-quote="TwistedThrottle" data-source="post: 732106" data-attributes="member: 46724"><p>I have the AF P 70-300 4.5-5.6 (fx) and also the Sigma 150-600.&nbsp; I have not used the 100-400.&nbsp; I use the 70-300 for having something compact that zooms pretty far on my crop body camera.&nbsp; It's also a fantastic day time portrait lens on a full frame camera.&nbsp; I use the 150-600 when I am going out to specifically shoot birds or wildlife or even the next state over from the top of a mountain.&nbsp; The 70-300 is smaller and lighter than the 100-400 but the 400 is equal to 600 on crop sensors.&nbsp; On a side note, I got the 150-600 because the 300 wasn't long enough for me, (450 on crop).&nbsp; Not sure if 400 would have been either.&nbsp; Since getting the 150-600, rarely am I shooting anything less than 600 through that lens, (which is 900 on crop) but its a beast of a lens so it's more of a plan-to-use-it kind of lens.&nbsp; I also end up using it more on my crop body than full frame.&nbsp; If you don't plan on getting anything longer and length is your priority, get the longest lens possible but be careful because as they get longer, they also get heavier.&nbsp; If its too heavy to be convenient, it gets left behind most of the time.</p></blockquote><p></p>

[QUOTE="TwistedThrottle, post: 732106, member: 46724"] I have the AF P 70-300 4.5-5.6 (fx) and also the Sigma 150-600. I have not used the 100-400. I use the 70-300 for having something compact that zooms pretty far on my crop body camera. It's also a fantastic day time portrait lens on a full frame camera. I use the 150-600 when I am going out to specifically shoot birds or wildlife or even the next state over from the top of a mountain. The 70-300 is smaller and lighter than the 100-400 but the 400 is equal to 600 on crop sensors. On a side note, I got the 150-600 because the 300 wasn't long enough for me, (450 on crop). Not sure if 400 would have been either. Since getting the 150-600, rarely am I shooting anything less than 600 through that lens, (which is 900 on crop) but its a beast of a lens so it's more of a plan-to-use-it kind of lens. I also end up using it more on my crop body than full frame. If you don't plan on getting anything longer and length is your priority, get the longest lens possible but be careful because as they get longer, they also get heavier. If its too heavy to be convenient, it gets left behind most of the time. [/QUOTE]

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