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Tamron SP AF 28-75mm f/2.8 XR Di LD Aspherical Macro Lens (Model A09)
This is for older model cameras. Doesn’t t not work on Newer model cameras. Only older.
Tamron SP: Super Performance. This is Tamron’s line of premium, higher-grade lenses.
AF: Autofocus. It uses a built-in mechanical drive to focus automatically when attached to a compatible camera.
Aspherical: It features specially shaped internal glass elements that reduce optical distortion and keep the lens compact.
XR: Extra Refractive Index glass. This design bends light more efficiently so Tamron could make the lens smaller and lighter than standard f/2.8 zoom lenses.
Di: Digitally Integrated. Optimized for digital sensors (reducing reflections and flare) while remaining fully usable on older film cameras.
28-75 mm: Your zoom range, going from wide-angle (28mm) to short telephoto portrait range (75mm).
1:2.8: A constant f/2.8 maximum aperture. This means the lens lets in a lot of light, making it great for blurry background "bokeh" and low-light shooting. It stays at f/2.8 no matter how far you zoom in.
Macro: Indicates it has a close minimum focusing distance (about 13 inches), letting you get detailed close-up shots of smaller objects.
67: The standard front filter thread size is 67mm. Any lens cap or screw-in filter (like a UV or polarizer filter) you buy must be exactly 67mm