What is this ring showing on my lens?

Started 6 months ago | Questions thread
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Sagnet New Member • Posts: 7
What is this ring showing on my lens?

Hi guys! Just bought the EOS 90D, which was an upgrade from my EOS 650D (Rebel T4i). I have some old lenses I'm planning to use with the 90D. One of them is a Sigma 50mm 1.4. However, when shooting with this wide open on the 90D, there is a circle showing. What is this? The aperture, or something else?

It only shows at 1.4, it goes away when stopped down to 1.6. It does not show on my 650D at 1.4. I find this strange, as both cameras are APS-C format.

ANSWER:
Canon EOS 90D Canon EOS Rebel T4i (EOS 650D / EOS Kiss X6i)
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