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<blockquote data-quote="kirbfucius" data-source="post: 151036" data-attributes="member: 14121">I'm not really sure what exactly you are asking, but that probably has something to do with the format of your post.So you have £600 to spend on a lens, you currently own the D5100, and you're in the market for a telezoom lens.&nbsp; From your other post, it appears that you own the Sigma 135-400mm manual focus lens.&nbsp; The biggest issue I've found with long zoom lenses is that they tend to get pretty soft at the extremes.&nbsp; The Sigma 150-500mm is definitely soft on the long end as seen <a href="http://www.bythom.com/sigma-150-500mm-lens-review.htm" target="_blank">in this review</a>.&nbsp; The 120-400mm suffers the same; it is soft at 400mm.&nbsp; I'm fairly certain this can be said of pretty much any zoom lens, though.&nbsp; It's a tradeoff.That being said, you can definitely learn to work within the sharper ranges.&nbsp; Putting the 150-500mm at about 400mm and f/8 should get sharp shots assuming there is available light.</blockquote>

[QUOTE="kirbfucius, post: 151036, member: 14121"] I'm not really sure what exactly you are asking, but that probably has something to do with the format of your post. So you have £600 to spend on a lens, you currently own the D5100, and you're in the market for a telezoom lens. From your other post, it appears that you own the Sigma 135-400mm manual focus lens. The biggest issue I've found with long zoom lenses is that they tend to get pretty soft at the extremes. The Sigma 150-500mm is definitely soft on the long end as seen [URL="http://www.bythom.com/sigma-150-500mm-lens-review.htm"]in this review[/URL]. The 120-400mm suffers the same; it is soft at 400mm. I'm fairly certain this can be said of pretty much any zoom lens, though. It's a tradeoff. That being said, you can definitely learn to work within the sharper ranges. Putting the 150-500mm at about 400mm and f/8 should get sharp shots assuming there is available light. [/QUOTE]

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