re: Digital camera question - lenses

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1. Is it worth upgrading the camera? I’m assuming there have been significant improvements in the last 10 years.

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Yes. Upgrade the camera body. If you want to be able to use the lenses you've already purchased stay with a Canon APSC (crop sensor) Camera.

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2. I’m also assuming the lenses haven’t changed and are still worth using - are camera lenses universal? Should I be shopping for a camera that can use the same lenses?

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Yes, the lenses are still worth using. No, the lenses are not universal, you need to stay within the same lense mount. The T3i and any other Canon APSC camera can use both EFS and EF lenses. Note that EF lenses are intended to be used with a full-frame camera so multiply the focal length by 1.6 for use on APSC.

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3. Can anyone recommend a camera that will fit with her lenses? DSLR? Will a mirrorless use the same lenses?

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Canon 90D if you want to stay DSLR or Canon R7 if you want to go mirrorless and buy an adapter to use your old lenses.