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<blockquote data-quote="RobHD" data-source="post: 526503" data-attributes="member: 41534">hoping you guys and gals may be able to assist, my Sigma APO 70-300 lens has started to suffer and getting sharp images from it in anything but bright light or the moon is getting frustrating, and the other night i caught it in the act of slipping affecting the focus.It seems ok in day light on autofocus but its the manual focus it suffers specially above 135mm.im using it on a D5200.So im now looking for a new lens. im looking at the DX 55-300mm or the FX 70-300mm , most of the reviews suggest that the 70-300 is faster on auto focus but the image quality on both is very similar, if this is the case id rather take image over focus speed, i know its needed for birds and sports, but i rarely photograph sports and i wait for birds to land giving the lens time to focus.other than the obvious cropped and full frame differences is there something im missing stopping me purchasing the DX 55-300?thanks</blockquote>

[QUOTE="RobHD, post: 526503, member: 41534"] hoping you guys and gals may be able to assist, my Sigma APO 70-300 lens has started to suffer and getting sharp images from it in anything but bright light or the moon is getting frustrating, and the other night i caught it in the act of slipping affecting the focus. It seems ok in day light on autofocus but its the manual focus it suffers specially above 135mm. im using it on a D5200. So im now looking for a new lens. im looking at the DX 55-300mm or the FX 70-300mm , most of the reviews suggest that the 70-300 is faster on auto focus but the image quality on both is very similar, if this is the case id rather take image over focus speed, i know its needed for birds and sports, but i rarely photograph sports and i wait for birds to land giving the lens time to focus. other than the obvious cropped and full frame differences is there something im missing stopping me purchasing the DX 55-300? thanks [/QUOTE]

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