Why not 1,4x teleconverter to the 55-300?

Started 5 months ago | Discussions thread
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JahnG
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Why not 1,4x teleconverter to the 55-300?
5 months ago

Hi.

One of my current lenses is the Pentax 55-300 f/ 4-5.8  lens (and my main body is the Kr).

The Sigma 150-500 /5.0 - 6.3 is  available in Pentax mount, so one would think the AF would work also in the tele area, or doesn't it ???

On the other hand, if I would use a Pentax 1.4X tele converter with my 55-300mm lens, it shouldn't be much worse (OPTICALLY) than the Sigma lens, being roughly 4.5-6.3 ???  Yet it is said that the AF wouldn't work in the tele area???   So, doesn't the AF work in the tele area of the Sigma 150-500  either, or am I missing something?

regards

JahnG

 JahnG's gear list:JahnG's gear list
Panasonic Lumix DMC-FX30 Panasonic Lumix DMC-ZS40 (TZ60) Pentax K100D Super Pentax K-r
Pentax K-r
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