Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: I heard there was a $100 rebate running right now on this lens. Is this correct and are you offering  this?
Document: I got this lens to fill the gap with my 24-105mm and 100-400mm that would compliment my 5D II - I wanted something to use for school events and wildlife at dusk that had some reach and constant f/2.8, the VC (or IS) was very important to me as well. The Canon equivalent is $1,000 more, so I decided to give this lens a try. I was so very pleased right from the start.
You may be in the same situation that I was in. I was needing a professional zoom lens but couldn't justify spending $2400 for a Nikon. I looked at alot of reviews of this lens and they all said this was a great buy. I saw that Tamron had a $100 off rebate and then Amazon had a 2percent rewards back so it looked like a good time to take action. This lens looks, feels and performs PRO.
They told me that not only is it NOT covered by Tamron USA 6-year Warranty (no warranty at all, unless I go to Japan), but that they have no way to know the quality of Grey Market lenses, and will not service them if there is a problem. Oh, and no $100 rebate either, naturally. And, Amazon is not an authorized Tamron Retailer.
Note: I cannot compare this to the Nikon version as I've never used it. I've heard the autofocus is better, but I've had no issues with the autofocus from this lens.This is a very sharp lens, even wide open.
The build is not as good as the Nikon lens especially the focus ring. But I have not complain about the picture quality or the focus speed. Good lens and good purchase. Of course if you can afford $100 more then go for the Nikon Lens. I am happy with the money saved and good photos.
So far, amazing. There are some buyers who indicated that they found a need to &#34;warm up&#34; the VC. My copy seems to lock right in from shot #1. At this point, I highly recommend checking this lens out.
This lens does everything one could ask of it and more. At 65 years old I can shoot down in the 1/30 range with no movement. This is my second of the new Tamron lenses and I rate them right up there with the Canon. At $1000 less than the comparable Canon lens these just make perfect sense.
For anything beyond 4.0 the lens is extremely sharp, and I would have no hesitancy shooting at 2.8 unless you're going to take a 100% crop and expect the hair on someone's head to be prime-level sharp.Autofocus - The autofocus is fast. I would imagine that unless you're a pro sports photographer whose job depends on getting every shot, this lens's autofocus is plenty fast.
Easy enough to consciously compensate for that however.The color in the images were right on and rich. Not too saturated. I keep my settings on my 5DII onthe Natural/Faithful setting and shoot Raw.This was a very quick experience with this lens, but enough so that I would consider purchasing one of thesein the future depending on how they how up in professional use.Nothing felt cheap or loose in the lens or controls. There is no focus limiter or panning option.
I debated between this lens and Nikon 70-200 F/4. Decided to get this due to faster aperture of 2.8. I regret this decision. Even though Nikon is a bit slower, I don't think the IQ can be any worse. From what I heard Nikon is a very capable lens but I don't own it yet. So I did some test shots with this and Nikon 55-300 (kit lens for D5200) and amazingly Nikon beats this lens in IQ, color saturation.
Answer: Most likely a price below $1499 is from a vendor that is not an authorized Tamron dealer. This means you may not be eligible for any rebates or the 6 year warrantee offered by Tamron. Most authorized dealers are going to set the price at MSRP ($1499). It is up to you if a discounted price is worth giving up any rebates and (more importantly) the 6 years of coverage. Go to http://www.tamron-usa.com/dealers.php to see if the dealer who is selling the lens is an authorized dealer of Tamron. If the cheapest price on Amazon is not from an authorized dealer go to the list of all dealers selling the lens on Amazon and find one that is authorized according to the Tamron website. I just bought this from Murphy's Camera because the rebate and warrantee were more important to me than saving a couple bucks. This is especially true when you consider the lens is not cheap and it would really bum me out if I needed to get it fixed out of warrantee.