Product Description
Compatible with QuickPort inserts Includes color-matched mounting screws
Product Description
QuickPort is a system of wallplates, housings and snap-in modules that allows you to combine audio, video, phone and data jacks together in a single wallplate. Connections are simple and easy, without messy soldering. Field configurable wallplates and housings create custom multimedia solutions. Installing QuickPort today allows you to wire for future technologies. With QuickPort, connecting to the future is literally a snap.
Product Description
Single-Gang and Dual-Gang wallplates accept QuickPort snap-in modules to support multimedia station applications with 1, 2, 3, 4, 6, 8 and 12 ports. Use where port I.D. windows in a single-gang or dual-gang economical flush-mount housing is desired.
Product Description
Single-gang flush mount wallplates offer field-configurable flexibility in an attractive single-piece housing. A choice of 1-, 2-, 3-, 4- or 6-ports allows for a variety of configurations and future expansion if needed. The wallplates are fully compatible with all QuickPort snap-in modules including connectors or blank fillers.Port and station identification can be handled in a number of ways. Match the modules to the plate for a sleek look, or use different colors for port ID. Port designation labels are available for identifying different networks or port assignments for the wallplates. QuickPort wallplates are UL Listed, CSA certified, and are listed in compliance with NEC Article 800.
Product Description
The SP AF PRO-series teleconverters, with a newly designed optical construction (4-group/5-element for 1.4X and 4-group/7-element for 2X), are designed to be used with lenses that are F/2.8 and of focal lengths of 90mm or greater. This would make the use of the SP teleconverters ideal for the Tamron SP90mm F/2.8 macro, 70-210mm F/2.8 and 300mm F/2.8. Relative illumination is significantly improved resulting in better overall contrast and resolution across the entire image field. In addition, chromatic aberration and astigmatism are better compensated for by virtue of the use of higher-grade glass materials and more sophisticated design techniques than used in universal-type teleconverters. When used with lenses with smaller maximum apertures (F/4 and F/5.6, for example), there will be little difference in image quality as compared with the standard Tamron teleconverters. When used with lenses wider than 90mm, the SP teleconverters can actually comprise image quality.The 2X doubles the focal length of the master lens and makes the lens two f-stops slower. In addition to increasing focal length, this teleconverter allows greater magnification in macro since the Minimum Object Distance (MOD) of the master lens does not change when used with the teleconverters. AF will be retained with the 2X teleconverter if the master lens is F/4.0 or faster.
Customer Reviews:
Double your focal length.......2006-08-11
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.
2x exrender.......2006-03-03
The lens is very good, however, no place in the ads did it mention that this lens was not intended for use with digital cameras. I discovered that the auto focus did not work at all well, but it was usable with manuel focus to some degree. I am somewhat disappointed.................Joe Ehrlich
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