Do we still need a TC?

Started Nov 11, 2013 | Discussions thread
audiobomber Veteran Member • Posts: 5,761
Re: Do we still need a TC?

Mark Ransom wrote:

A teleconverter works by magnifying the image that it gets from the primary lens. You could get the same effect by simply cropping, but the assumption is that the magnified image will be higher in quality than the cropped image.

That's not what I believe at all. The main lens has a certain level of IQ. Adding a TC can only deteriorate the IQ by adding aberrations and losing sharpness. A good TC will only compromise the lens a little bit. Differences would only be visible in extreme conditions and at pixel level magnification.

The reason I need a TC with my DA*300 is that I frequently crop so hard that I run out of pixels (birding mostly). Having 24mp helps, but 24mp plus the TC is even better.

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