i searched a bit on ebay and in the forums and found some helpful information about the loss of quality with a 2X teleconverter and so on and am now not sure if i should better get me a cheap zoom lens like the tamron 55-200 or the nikon 70-300.
but due to some space problems in my camera bag i would prefer a converter. anyone had experience using one in combination with a (moderate) wide/zoom lens like the tamron 28-75?
and what about brand?
A Cost effective TC that I would suggest is the Kenko Teleplus Pro 300 DG series. The x1.4 is @ 150.00 on ebay. Has the same Hoya glass that the Tamron/Sigma TCs have but cost less.
Remember that you are adding an f/stop with a x1.4 and I believe 2 with the x2 convertor. Make sure your lens is plenty fast with a x2 Teleconvertor. A slow lens will hunt if it focuses at all with a x2 TC.
As far as using with a 28-75mm I have tried the Kenko and it works fine...I threw my 50mm on it for fun and had no detail loss... but it really don't get you out there too much further.
The Kenko on the 70-200mm 4L is cool as it gets me out there to about 280mm.
I am not big on cheap zooms but my buddy picked up one of these for @ 180.00 new and from what I have seen it appears to be the best of the budget zooms.
I have the 70-200 2.8L and a Canon 2xTC for longshots. I can cope with f5.6 (just). The images are marginally softer, but not unmanageably so. The advantage to me is in not carrying around a huge 400mm lens - that would be a serious extra weight.
I am not sure that it will be a significant use on a 28-75. Your max zoom would still only be 150mm, and the cheap zooms will do a much better job (while still being light and relatively small). In fact, the smaller of the zooms will not be much bigger than a decent TC.
