Re: Official: Tamron 35-150mm F/2-2.8 Di III VXD (Model A058)
zeitlos wrote: ruthenium wrote:
These can be more revealing of the behavior of this lens than images of charts.
I am not an expert (basically far from being one), so can you explain this technically?
I would imagine he is alluding to the fact that lenses can often optically behave quite differently depending on where the focus point is. Weaknesses is resolving power tend to show themselves when trying to resolve fine details at near infinity focus from a distance. Of course the problem you encounter at near infinity is knowing what is lens aberration and what is atmospheric interference. I probably should try to take some more test shots early in the morning as these were taken in the middle of the day and some atmospheric interference is clearly visible, but I think Immortal is correct that I may have a less than stellar copy if y'all aren't seeing the same sort of haze wide open.
More similar to your test chart example, here's some shots of a bookcase, and at f/2.8 you can still see a slight haze/halo in areas of high contrast that is improved dramatically by f/4. I checked for the same behavior with my wife's A7R3, and it is present there also, so it does appear to be with the lens and not an issue with either of our sensors (thankfully). I'm going to test it in a few more situations, but I'll likely submit a return and reorder. This copy is slightly decentered, so who knows - that may be the cause. Despite this initial hiccup, I'm absolutely sold on the lens and what its potential capabilities are with a centered copy. I'll go through as many as it takes to own a good copy.
Nov 05, 2021 at 08:01 PM
Previous versions of photosbyjaron's message #15759397 « Official: Tamron 35-150mm F/2-2.8 Di III VXD (Model A058) »
