Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of movie technology specialist IMAX (Nasdaq: IMAX) were fading to black today, falling as much as 11% in intraday trading on heavier-than-average volume.

So what: Research firm Stifel Nicolaus lowered the boom on IMAX today by dropping its price target for the stock from $32 to $27. The Stifel analyst suggested that there was too much optimism regarding the back half of the year and thinks that results are going to disappoint the market.

Now what: I'm a pretty simple investor and though I recognize that sometimes you have to pay up for growth, I tend to like stocks with cheap price tags. Even after today's drop, a cheap price tag is one thing that IMAX doesn't have -- at least in my view. The stock has, however, been a longtime, high-return pick from the growth-oriented Fools over at Rule Breakers. And with cumulative performance since 2004 that's topped the S&P 500 by 60%, I'm inclined to think those Fools know how to pick great growth stocks.

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Fool contributor Matt Koppenheffer does not have a financial interest in any of the companies mentioned. You can check out what Matt is keeping an eye on by visiting his CAPS portfolio, or you can follow Matt on Twitter @KoppTheFool or Facebook. The Fool's disclosure policy prefers dividends over a sharp stick in the eye.