Bozsik Loc: Orangevale, California

I don't know why Nikon has never made tele-converters that work with lenses other than their super telephotos. Has anyone here tried The Sigmas with any of the regular Nikon long lenses? I was thinking it could prove useful in a pinch should you need a really long lens.

MT Shooter Loc: Montana

Because the quality on anything over an F4 lens falls off sharply. You won't have enough light to AF, and your images will suffer from the degradation of light. Most quality converters are matched optically to specific lenses, no matter who the manufacturer is.

Bozsik Loc: Orangevale, California

I was just curious that they can make such high quality lenses nowadays, that they are not able to produce a high quality teleconverter as well. Maybe the technology just isn't quite there yet, or you can't do it with an additional set of glass altering the light.

It was just a curiosity thing. Seems sad that one has to pay an arm, leg and sometimes and additional arm, to get a quality long lens. The price has never come down on the 2.8 lenses even though they have been making them for a long time. My first Nikon 300mm 2.8 cost a small fortune at the time it was sold, and now the new ones to date are much more expensive even with the price of inflation.

I was just hopping you and the rest of us would be able go get one for under $1,000 some time next week, but I guess that isn't going to happen. ;-) :lol:

MT Shooter Loc: Montana

Its called inflation. The dollar is worth less and less every year, almost every day anymore. As time moves on, new features demanded on our lenses by progress keeps the cost high for high quality. Competition drives prices down, but if low-cost competitors cannot equal the quality of name-brand manufacturers, there will be no serious competition. As it is, the high quality lenses have a high demand and the manufacturing process is slow and expensive, so the prices will stay high on these lenses for a long time to come. One thing I have not seen yet is something like a 500mm F4 DX lens. Due to the manufacturing savings of smaller lens elements I would think these lenses could be made for less than half the FX lenses offered, but the demand would have to be there for the manufacture of these. I have to wonder how many crop sensor owners would really want to drop $4000 for a DX lens like this that they could never use efficiently on a full frame body. Probably not nearly enough to justify the engineering and development cost.

BboH Loc: s of 2/21, Ellicott City, MD

I use Kenko's with lenses that Nikin says dont' work with tele-extenders - they auto focus until the light falls off too much - then its manual focus. Other than that, it works fine.

Hoosier in GA Loc: Milledgeville, GA

I also have a kenko teleconverter. It works with AF on my Nikon 18-70mm, but on my 70-300mm AF seems to bounce around so I use manual focus....no complaints...knew it when I bought it.