Doc Barry wrote:
Walt,
The lenses are designed expecting a QUALITY filter will be used. Also, if you look at the Amazon offering, it tells who is the vendor. I purchased mine through Amazon which also was fulfilled by Amazon for a reputable photo company in Florida who is an authorized vendor for Tamron, Nikon, Canon, etc. Price was excellent, USA warranty, etc.
Since when? If they were designing for a filter to always be used they would just build the filter in. If I knew a given lens was designed to only work well with a filter, quality or otherwise I would get a different lens.
The 100-400L mk 1 for one had a reputation of not playing well with any filter. I know mine lost IQ with a filter. The AF also seemed to be a bit slower in some light conditions.
And I go with "use the hood" to protect the front of the lens.
That Florida dealer who sells a lot through Amazon sounds like Digital Goja - I have bought a few things, including my Tamron 150-600 G2, from them.