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07-18-2007, 05:12 PM   #1
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1.4x tamron k or 140f teleconverter?

I'm looking for a TC for my tamron 300mm f2.8 and was wondering if anyone knows whether a modern k-mount tamron or other 1.4x or 1.5x is as good or better than the adaptall teleconverter 140f? The advantage of the k-mount of course would be useable on other lenses, probably easier to put on too.


07-20-2007, 12:58 AM   #2
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Hi Tom.

Tamron 1.4 tele does not work well with any of my pentax lenses, especially compromising the colour and sharpness by a mile.

However, the search of Tamron 1.4X used on a quality lens like Tamron 300/2.8 on line reveals a few articles showing reasonable image quality if stopping down the aperture by 1 stop or so. One of the articles written by a Canon pro who uses the combination of Tamron 1.4X and Tamron 300 f2.8 a great set up for wild life photography. Lighter to carry and produce a lot of great images for sale. The corner sharpness is lacking to a degree but it is hardly relevant in wildlife photography.

Sorry, I do not have any clues what 140f tele is ...

07-20-2007, 03:09 AM   #3
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Thanks for the response james,
The 140f is the tamron 1.4x adaptall converter and will only fit these lenses.

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