Buy Tamron SP AF 2x Pro Teleconverter for Nikon Mount Lenses (Model 300FNS)Tamron SP AF 2x Pro Teleconverter for Nikon Mount Lenses (Model 300FNS) Product Description:
- Increases focal length from same camera position by 2x
- Superior performance for unsurpassed image quality and ease of use
- Fits easily between lens and camera body
- Includes carry case
- For use with Nikon Digital SLR cameras
Product Description
A Teleconverter is a great way to extend the focal length of your lens. This Teleconverter will extend the focal length of your lens by 2x giving more magnification. The Tamron Pro series Teleconverter offer superior optical construction for improved image quality.
Customer Reviews
Most helpful customer reviews
81 of 83 people found the following review helpful.
Tamron vs Canon SP Autofocus 2x Pro
By Howard Lower
I am a professional that uses Canon L lens only and was using Canon Teleconverters both 14x and 2x that I use extensively without a Problem. But, I have decided to go with the Tamron SP Autofocus 2x & 14x Pros.Why? I have done extensive testing on the four teleconverters and have found that there is no noticeable difference beween like teleconverter. The only exception is the Canon's are heavier and longer and protrude into the lens but are not any better than Tamrons. Another professional friend of mine also looked at the results and was equally surpised.Tamron's will work on more lens as they do not protrude into the lens like the Canon's do. Remember that lens will only auto focus if you are f8 or less (bigger)lens f-stop. If you add a 2x to an f4 lens it will not autofocus. I manually focus when I have a long telephoto lens on to get out to 800mm but this means with my f4 lens it is really now f8 so requires manual focus. Tamron has a very good little manual that explains all of this. Good luck, Howard
38 of 38 people found the following review helpful.Excellent accessory
By Michael Gordon
A teleconverter is basically just a high quality concave lens that spreads the image wider, the sensor thus sees the center of this spreading. It is sort of like cropping and enlarging right in the camera. The result, in this case, is a doubling of the effective focal length -- a 200mm lens becomes a 400mm lens -- but you also lose 2 f-stops of light. F2.8 becomes f5.6.I purchased this Tamron 2x teleconverter to augment Tamron's 70-200mm f2.8 telephoto zoom (hereafter called T70) on a Nikon D700 body. The combination then becomes a 140-400 f5.6 lens. The T70 and this converter cost together around a thousand dollars; but the Nikkor 200-400 f4 (the next thing better) is $6,000 and you get only one f-stop more light at six times the cost.The good news is that it works.I've tried three lenses on it so far. (1) The T70; (2) a Nikkor 28-300mm VR; (3) and a cheap 500mm "long lens". All three work well. There's not really much point in using a superzoomThe teleconverter includes a screw-focusing passthrough for your old lenses that are focused by a motor in the camera body, aperture stopdown ring and CPU coupling contacts. As always, make sure you have turned off your camera before adding or removing these things. If you do it anyway, you can remove the camera battery for a minute or so and that might reset everything. It did for me anyway.Picture quality is better than expected, I would say excellent. No discernable chromatic abberation even at 200x previewing in Photoshop. Just a hint of spherical abberation. It doubles any defects in the lens attached to it so start with a good lens.Autofocus -- In theory, yes, in practice it depends on the lens you use it with. The T70 already "hunts" a bit too much and the teleconverter merely increases its tendency to "overshoot". The 28-300 didn't autofocus worth a hoot but at f5.6 to start with, f11 effectively when doubled, that's not to wonder. Just put it in manual.The front lens element mount is recessed 7/16 inch, or 11 millimeters, below the lens attachment mounting plate. Your lenses that project more than this beyond the mounting plate won't fit.It is solidly constructed but relatively lightweight.Altogether I am very pleased with it.
36 of 39 people found the following review helpful.
Double your focal length
By Technology Guy
I realize now that I probably would have been fine with the non-PRO version of the teleconverter -- I'm not certain whether the differences between the PRO and standard actually justify the extra cost (unless you use Canon L lenses perhaps). But that is neither here nor there.The Tamron SP Autofocus 2x Pro Teleconverter doubles your lens' focal length and adds two f-stops (meaning you'll be getting 1/4 the light with the teleconverter). This is the same for all 2X teleconverters. The addition 2 f-stops will make it difficult to use autofocus unless you have a fast lens and lots of light to work with. You'll also want to use the teleconverter with a long telephoto lens.The Tamron SP Autofocus 2x Pro Teleconverter works as advertised with 35mm and digital cameras. I've had no problems using a Tamron 70-300mm lens with this teleconverter on a Rebel XT aside from the expected auto-focus issues. There are a few issues I noticed though beyond the typical problems found with any 2X teleconverter:(1) The teleconverter causes autofocus to misbehave with some lenses. The only lens I've ever had this happen with is a Sigma High Speed 28-70mm f2.8-4 zoom. It wasn't just that the autofocus couldn't achieve a lock but seemed to be more of an incompatibility issue with the lens focusing in and out nonstop.(2) The Canon Rebel XT kit lens - and probably all EF-S lenses - will not phyically FIT into this teleconverter. The EOS digital-only EF-S mount lenses won't physically fit in standard 35mm cameras either so this isn't a total surprise.(3) Using this teleconverter with a non-auto-focus manual-only lens (or a telescope) will stop the shutter release button from functioning. I understand this is a fairly common problem with teleconverters. The solution is, when attaching the teleconverter to the camera, to avoid rotating the teleconverter completely so that it does not lock in place. This ensures that the camera and teleconverter electrical contacts are not engaged.I find the Tamron SP Autofocus 2x Pro Teleconverter quite useful though perhaps a bit overpriced for those of us without premium lenses.
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