Only for today (3/2/2020) B&H Photo has the Datacolor SpyderLensCal Autofocus Calibration Aid on sale.

Get the Datacolor SpyderLensCal Autofocus Calibration Aid at $39 instead of $69. Free shipping.

While $39 will likely not break your bank, there is an even less expensive way to calibrate autofocus on your lens.

More hand-picked deals are listed here.

Key features:

• Fast, easy solution for your interchangeable lenses and recent DSLR bodies provides razor-sharp auto-focusing, using modern DSLR autofocus micro-adjustment technology
• Compact, lightweight and durable, with integrated level and tripod mount, making this the most convenient way to adjust your own camera gear
• Save time and hassle of sending your equipment in for service. Now you can check or calibrate your own lenses
• Accurate and repeatable calibration of your lenses and recent DSLR bodies
• Worthwhile investment to ensure your camera is focusing your lenses as precisely as possible