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<blockquote data-quote="WhiteLight" data-source="post: 286881" data-attributes="member: 9556">It's not too complicated..as a general rule, as the focal length increases, the quality depreciated... slightlyfor example the IQ of a 18-200 which covers a lot, is not going to be the best..along the same lines, a prime lens provides best IQ.it's manly a matter of convenience &amp; trade offsif you prefer to cover a lot of area, through one lens - the compromise would be the IQ (very mild difference)but if you font want to trade off on the IQ, you give up on convenience <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />that's mainly why most portrait shooters would prefer a prime lens.since you need to be at the max zoom to obtain the best bokeh (if you've noticed, your 55-200 will have better bokeh at 200mm as opposed to 55), a prime lens is at all times at the max zoom.tried to put it as simple as possible,so please excuse any technical incorrect blah blah</blockquote>

[QUOTE="WhiteLight, post: 286881, member: 9556"] It's not too complicated.. as a general rule, as the focal length increases, the quality depreciated... slightly for example the IQ of a 18-200 which covers a lot, is not going to be the best.. along the same lines, a prime lens provides best IQ. it's manly a matter of convenience & trade offs if you prefer to cover a lot of area, through one lens - the compromise would be the IQ (very mild difference) but if you font want to trade off on the IQ, you give up on convenience :) that's mainly why most portrait shooters would prefer a prime lens. since you need to be at the max zoom to obtain the best bokeh (if you've noticed, your 55-200 will have better bokeh at 200mm as opposed to 55), a prime lens is at all times at the max zoom. tried to put it as simple as possible,so please excuse any technical incorrect blah blah [/QUOTE]

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