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Message: <blockquote data-quote="STM" data-source="post: 275490" data-attributes="member: 12827">A 2X TC will cut the light to 1/4 of the original or two stops, a 1.4X to 1/2 or 1 stop. One of the advantages of digital over film is you can just up the ISO to compensate for the loss in light. All TC's will degrade image quality to some degree. The more highly corrected they are, the less degradation there will be but also the more expensive they will be. My TC-300, even used on Ebay was still over $200.  I use Nikon TC14 and TC300's with my AIS lenses and up to 11x14 I really do not see much degradation at all.The two images below were taken with my 600mm f/4 ED AIS and TC-300 and D700. You can still produce images of very high quality with a TC</blockquote>