Tamron says there is an issue with the 20mm F/2.8, 24mm F/2.8 and 35mm F/2.8 lenses when used on an A7IV. The lenses switch to manual focus on their own during video recording. They are investigating.
j4nu wrote:
Well, that would nullify one of the great advantages of open (licensed) e-mount...
Definitely. I was just kidding. Although Sony lens division is probably chuckling a bit at Tamron's woes right now.
By the way, if it's an open mount, is there any official confirmation about whether Sony makes money from the sale of third party lenses? Kind of makes you wonder what the relationship between Sony and third parties is when snafus happen.
teddoman wrote:
Definitely. I was just kidding. Although Sony lens division is probably chuckling a bit at Tamron's woes right now.
By the way, if it's an open mount, is there any official confirmation about whether Sony makes money from the sale of third party lenses? Kind of makes you wonder what the relationship between Sony and third parties is when snafus happen.
That's a good question but I doubt Sony takes any blame on this .
teddoman wrote:
Although Sony lens division is probably chuckling a bit at Tamron's woes right now.
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Considering Sony owns a significant percentage of Tamron, I rather doubt it.
It is not like these OSD primes are otherwise good for video. They are slow and noisy and their focus action causes the image to bounce around. They are inexpensive stills lenses not designed for video recording.
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