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<blockquote data-quote="aroy" data-source="post: 226328" data-attributes="member: 16090">The DX specific lenses have a small image circle that does not cover the full FX area. For reduced image circle a smaller diameter glass is used, hence the DX specific lenses are lighter and cheaper to manufacture compared to corresponding FX lenses. But when you use them with FX sensor you will not be able to cover beyond a diameter of approximately 24mmThe FX has larger image circle so the image subtended by FX lense will &quot;overflow&quot; the DX area - this is same as covering a small box (24mmx18mm in this case) with a large lid of 36mm diameter instead of a lid of 24mm diameter. There is nothing wrong with this except the lid is much larger than required.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite6" alt=":cool:" title="Cool&nbsp; &nbsp; :cool:" loading="lazy" data-shortname=":cool:" /></blockquote>

[QUOTE="aroy, post: 226328, member: 16090"] The DX specific lenses have a small image circle that does not cover the full FX area. For reduced image circle a smaller diameter glass is used, hence the DX specific lenses are lighter and cheaper to manufacture compared to corresponding FX lenses. But when you use them with FX sensor you will not be able to cover beyond a diameter of approximately 24mm The FX has larger image circle so the image subtended by FX lense will "overflow" the DX area - this is same as covering a small box (24mmx18mm in this case) with a large lid of 36mm diameter instead of a lid of 24mm diameter. There is nothing wrong with this except the lid is much larger than required.:cool: [/QUOTE]

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