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<blockquote data-quote="AxeMan - Rick S." data-source="post: 92026" data-attributes="member: 1746">The 5100 is a cropped sensor (x 1.5) so your 70-300 is going to be a 105 - 450 if my thinking is correct.&nbsp; Going to help on the long end but might hurt you on the short end.&nbsp;If it were me I go with the 50-300 just so I would have some workable range on the short end, and sell the 55-200.&nbsp; Once you move away from the 55-200 you will never use it again.&nbsp;On the other side of the coin, RickSawThat's 365 is a testimony of what the 70-300 can do on the D5100.&nbsp; However I like to point out most of his photo's are shot at ISO 1000 or higher in most cases. It's something to think about you're going to need a high ISO to get your shutter speed above 400 to cover the length of your lens in the ISO triangle.&nbsp; This is typical of&nbsp; &quot;Slower&quot; glass at f5.6 and not saying the 50-300 would be any better.&nbsp; I imagine it would be the same.&nbsp;As pointed out the 70-300 is an FX lens, FX bodies can handle the higher ISO a lot better then SOME DX bodies.&nbsp; I have never used a D5100 I can not say how it performs at a higher ISO.&nbsp; I have one lens that is an FX and on my D90 I'm not too happy with the way it performs, and since moving to fast glass a year ago it has sat in my bag.&nbsp;As a side note; Rick, I'm not knocking your work your making that lens and body work really well together. Keep up the great work!&nbsp; I would like to see what you could do with a f2.8 70-200 lens or longer some day. <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="AxeMan - Rick S., post: 92026, member: 1746"] The 5100 is a cropped sensor (x 1.5) so your 70-300 is going to be a 105 - 450 if my thinking is correct. Going to help on the long end but might hurt you on the short end. If it were me I go with the 50-300 just so I would have some workable range on the short end, and sell the 55-200. Once you move away from the 55-200 you will never use it again. On the other side of the coin, RickSawThat's 365 is a testimony of what the 70-300 can do on the D5100. However I like to point out most of his photo's are shot at ISO 1000 or higher in most cases. It's something to think about you're going to need a high ISO to get your shutter speed above 400 to cover the length of your lens in the ISO triangle. This is typical of "Slower" glass at f5.6 and not saying the 50-300 would be any better. I imagine it would be the same. As pointed out the 70-300 is an FX lens, FX bodies can handle the higher ISO a lot better then SOME DX bodies. I have never used a D5100 I can not say how it performs at a higher ISO. I have one lens that is an FX and on my D90 I'm not too happy with the way it performs, and since moving to fast glass a year ago it has sat in my bag. As a side note; Rick, I'm not knocking your work your making that lens and body work really well together. Keep up the great work! I would like to see what you could do with a f2.8 70-200 lens or longer some day. :D [/QUOTE]

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