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

Started 2 months ago | Discussions thread
Duckman21 Forum Member • Posts: 74
Re: 90d and Tamron 150-600 - sharpness issue or wrong expectations

JasonTheBirder wrote:

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.)

I find f7.1 good for some situations but in others it seems to still be soft compared to f8. For flying birds I typically use f8-f9, f11 for more distant scoping (though diffraction starts to set in).

Are you shooting APS-C or full-frame? I read some reviews saying this lens is much sharper on full-frame.

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 Duckman21's gear list:Duckman21's gear list
Canon EOS Rebel T6s Canon EOS 80D Canon EF-S 18-135mm F3.5-5.6 IS STM Tamron SP 150-600mm F5-6.3 Di VC USD G2
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