Higher-end DSLR bodies offer AF microadjustment to deal with exactly these focus issues, which become increasingly important for faster lenses, particularly primes. This is due the realities of mount and optical alignment tolerances and the need to correct focus measurements made by the secondary phase-detect optics for residual spherical aberration and other optical anomalies any particular copy of a lens may exhibit.
It's a simple reality of secondary phase-detect AF sensors in DSLRs that any given body and lens combination may require user calibration for accurate focus. Perhaps more importantly, though, are the customization features available.
#Sigma lens dock update#
The TAP-in console can update supported lenses to the latest firmware, making round-trips to Tamron service facilities unnecessary. Sony versions of these lenses are expected to supported at a later date.
Users can connect the console to their Tamron lens, connect the console to a PC or Mac via USB 2.0, then launch the TAP-in Utility software to perform lens upgrades and adjustments. The console is launching with compatibility for Canon or Nikon versions of Tamron's SP 85mm F1.8, SP 90mm F2.8 Macro, SP 45mm F1.8, SP 35mm F1.8 lenses, with the 45mm and 35mm lenses first requiring and update from a Tamron service facility to enable compatibility with the console. In principle, it appears to be similar to the Sigma USB Dock, which we reviewed here. Tamron has announced the TAP-in console which enables firmware updates and customized setup for select lenses.
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