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01-15-2008, 07:57 PM   #1
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I'm thinking of using Pentax FA 50/1.4 with a 2x teleconverter but know nothing about them,
idea is to get fast 100mm, what can I use and if this solution is cheaper then buying 100/2.8 lens. If so what should I look for. Thank you.


01-16-2008, 12:41 AM   #2
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I'd be looking at the DA* 50-135 f/2.8 ... it is a bit pricey ... but it is meant to be a jem of a lens
01-16-2008, 01:23 AM   #3
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Teleconverters are not intended to be paired with short primes at all. An actual 100/2.8 will blow the IQ of a 2x + 50/1.4 into the water, and at that focal length and speed are macro lenses too. Have a look at the Sigma 105/2.8 macro.
01-16-2008, 08:22 AM   #4
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In addition to the drop in image quality, the autofocus would probably be awfully slow.
A quality 2x teleconverter would run you $100 or so.... Dig up another $150 or so and grab one of the 90/100/105mm f/2.8 macro lenses. You'll be MUCH happier.

01-16-2008, 03:57 PM   #5
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Thank you very much, savings in January are so slow ;-)


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