Tamron's basic Adaptall telephoto — the 70-210mm f/4-5.6 at minimum specification.
The Tamron Adaptall 70-210mm f/4-5.6 is a basic telephoto zoom in Tamron's universal Adaptall mount system. The 70-210mm covers standard telephoto with a slow variable aperture. The Adaptall mount enables cross-system use via adapter rings. The most basic Tamron telephoto — no SP designation, no constant aperture, no CRF. Functional at minimum specification.
Basic Tamron quality at the entry level of their Adaptall range. Variable f/4-5.6 limits light gathering. Sharpness acceptable stopped down. The 70-210mm is standard telephoto. Build quality functional. The SP versions (IDs 4599, 4600) are significantly better. The constant f/3.5 and f/3.8 alternatives are also preferred over this variable version.
Adaptall mount — adapter required for your camera system. Filter thread varies. Weight moderate. Basic build. The most basic Tamron Adaptall telephoto. Many better Adaptall alternatives exist. Ensure correct adapter included for your specific camera mount system.
Very cheap — the most basic Tamron Adaptall telephoto. SP and constant-aperture versions preferred. The Adaptall versatility is the sole advantage. Only at near-zero prices when better versions unavailable. Ensure adapter is included with purchase.