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<blockquote data-quote="J-see" data-source="post: 354818" data-attributes="member: 31330">I did some quick testing to see the true effects of the +4 diopter on the quality and magnification of the 70-300mm.I didn't use a tripod or flash even when it wasn't the best of light since I wanted to create about the same conditions I experience when shooting handheld. I had to rotate some images which implies a part might be cut but I measured the originals.These are the results (D3300 sensor is 23.5mm):@70mm[ATTACH]112477[/ATTACH]66mm = 1:2.8@100mm[ATTACH]112478[/ATTACH]46mm = 1:2@135mm[ATTACH]112479[/ATTACH]35mm = 1:1.49@210mm[ATTACH]112480[/ATTACH]22mm = 1.07:1@300mm[ATTACH]112481[/ATTACH]16mm = 1.46:1It's quite obvious how quality and sharpness quickly degrades the more you go to the 300mm.PS: I got no idea why the attachments show instead of the images. Ah well...</blockquote>

[QUOTE="J-see, post: 354818, member: 31330"] I did some quick testing to see the true effects of the +4 diopter on the quality and magnification of the 70-300mm. I didn't use a tripod or flash even when it wasn't the best of light since I wanted to create about the same conditions I experience when shooting handheld. I had to rotate some images which implies a part might be cut but I measured the originals. These are the results (D3300 sensor is 23.5mm): @70mm [ATTACH=CONFIG]112477._xfImport[/ATTACH] 66mm = 1:2.8 @100mm [ATTACH=CONFIG]112478._xfImport[/ATTACH] 46mm = 1:2 @135mm [ATTACH=CONFIG]112479._xfImport[/ATTACH] 35mm = 1:1.49 @210mm [ATTACH=CONFIG]112480._xfImport[/ATTACH] 22mm = 1.07:1 @300mm [ATTACH=CONFIG]112481._xfImport[/ATTACH] 16mm = 1.46:1 It's quite obvious how quality and sharpness quickly degrades the more you go to the 300mm. PS: I got no idea why the attachments show instead of the images. Ah well... [/QUOTE]

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