This particular photography accessory is usually referred to as tc's or teleconverters / tele-converters. I don't have much in-depth knowledge on them but one thing I know is that they can extend the reach of the lens attached to one. And this Tamron baby is a 2x TC, does that mean that it doubles the reach by a factor of 2? Not sure. But I know that it definitely extended the reach of my lenses.

I bought this unit second-hand for about RM100 in immaculate condition so I don't have much to complain really. I also just bought a new Sigma 70-300mm, which I'm very happy with and I thought, maybe this can help me get a better shot of the moon - something I've been wanting to do for a long time.

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