90d and Tamron 150-600 - sharpness issue or wrong expectations

Started 4 months ago | Discussions thread
JasonTheBirder Senior Member • Posts: 1,400
Re: 90d and Tamron 150-600 - sharpness issue or wrong expectations

Duckman21 wrote:

This lens is hit or miss wide open at 600mm. It can be quite sharp on some occasions, but more often than not it appears hazy and soft. Your first image is consistent with how most of my f6.3 600mm images look even if objects are in focus. Stop it down to f8 or f9 if you want more sharpness (be sure to bring down the shutter speed if possible). Note that you will lose depth of field and it doesn't do anything about heat/atmospheric haze which this lens seems sensitive to at the longer focal lengths.

I think this is good advice. I never shoot mine wide open, but my gut feeling is that this lens peaks in sharpness at f/7.1, so I usually just leave it there unless I need more depth of field, or the subject is really far away and the focus point is too big for the bird. (I use it on a Nikon, but it's the same idea.)

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