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03-16-2016, 01:20 PM   #1
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Two 1.4 teleconverter

I have been using the pentax teleconverter for a year now and I love the quality I obtain.
Now what if I was to screw one more teleconverter on the camera, what would happened, how would the quality be?

03-16-2016, 01:39 PM   #2
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better than this:
Stacking Five 2x Teleconverters to Create a Ridiculous 9600mm Lens

But slightly less good than just 1.
03-16-2016, 03:00 PM - 1 Like   #3
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QuoteOriginally posted by Lucky-Luc Quote
Now what if I was to screw one more teleconverter on the camera, what would happened, how would the quality be?
I've stacked 2 HD TC on a DA300 f4. With one TC, image quality is decent and K-3 AF still good. But when two x1.4 TC stacked, image contrast and resolution takes a more significant hit, at f8 viewfinder gets dark and AF stops working. The reason I considered to stack two TC was for video, but it happens that video quality also dropped more than I initially thought. The simple explanation is that TC acts like a magnifier (virtually enlarging the image circle) but also magnifying diffraction effects that become relatively more visible with higher resolution image sensors. Two x1.4 TC on 300mm + K-3 provided about 900mm of FF equ. FL, opening up a world of photographic opportunities (if only the image quality was good enough).
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