LarJgrip Loc: The Fraser Valley

I have a T3i and am looking to upgrade to an R6 while continuing to use the T3i. Can I use the same lenses without sacrificing too much image quality? TIA

Lenses are:
Canon 18-55 3.5-5.6
Canon 55-250 4-5.6
Sigma 18-250 3.5-6.3
Sigma 150-500 5-6.3

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You lose over half your pixels. Up to you whether thaz OK.

If you have no opine of your own on that and you crowd source it, most users will say they would not do it.

BTW I think your 500mm zoom is a FF lens already.

CHG_CANON Loc: the Windy City

A questionable idea.

Your EOS T3i is an 18MP cropped sensor body. Going with an EOS R6 is only an increase to 20MP in a full-frame format. Alas, mounting your three EF-S lenses (18-55, 55-250, 18-250) lowers the pixel resolution of the resulting images to 7.7MP, due to the crop factor of using these lenses. That's a lot of money to spend on a full-frame mirrorless camera to deliver such reduced image files.

You should be looking at full-frame lenses along a full-frame camera. If you can't make both changes, you're looking at the wrong upgrade. Thinking to keep a cropped DSLR around after buying a full-frame mirrorless body also antithetical.

Consider a bundle with either the RF 24-105 or RF 24-240 lenses along with EOS R6 body so you have a full-frame general-purpose lens for this full-frame body. Plan to sell-off all the cropped equipment. You'll quickly / immediately have no use for the older equipment once a mirrorless wonder takes over the stable.

Or, consider any of the final EOS DSLRs, the EOS 80D, or 90D, or T7i, all extremely modern and advanced bodies, with larger pixel resolution increases vs the 20MP idea. Cheaper too.

TriX Loc: Raleigh, NC

You’re not going to get better recommendations than that.

LarJgrip Loc: The Fraser Valley

Thankyou for taking the time to deliver a great response and good advice.

imagemeister Loc: mid east Florida

NO - except for the Sigma 150-500 and maybe the 55-250 at the longer focal lengths.

LFingar Loc: Claverack, NY

Both of your Canon lenses and the Sigma 18-250 are designed for crop sensor bodies. The only loss of image quality will be in pixel count, which will be substantial. The Sigma 150-500 will work fine.
The suggestion by CHG_CANON to look for a bundle deal may be your best bet, or, see what is available in used RF lenses.
My first DSLR was a T3i. Fine camera, but, once you get your hands on an R6 and proper lenses you will forget it exists. Bet on it!

Jimmy T Loc: Virginia

Great recommendations!!!
I have a Canon RP w/24-105 F4 L and I seldom ever pick up my non-mirrorless cameras anymore.
Personally, if I were you I would go the EOS R6 w/ the RF 24-240 in a heartbeat.
Evidently, you have scoped out the EOS R6 body so do the research on the various RF lenses, and remember that they don't have to be the "L glass" models to be great.
Recommended reading follows:
https://www.kenrockwell.com/canon/eos-r/lenses/index.htm
https://www.kenrockwell.com/canon/eos-r/lenses/24-240mm.htm
Best Wishes,
JimmyT Sends

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"Non-mirrorless" LOL !

We can call FF "non-crop", multicoating could be called "non-single coating" and wired connections can be "non-wireless".

Non-chipless cookies, my most favorite non-sugarless snack. I like to wash them down with lots of non-nondairy milk :-)

(Download)

My very first non-mirrorless camera

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mdoing

I agree on the R6 with the 24-240, I have R6 with 24-105 non-L and have thought that I wish I had gone for the 24-240 instead. Not that there is anything wrong with the 24-105, just that more reach would be more fun!

willaim Loc: Sunny Southern California

You'll need an adopter for the EF lenses. However, using EF-s lenses, you'll lose about half of the pixel count. R-6 is a 20 MP and then you'll be shooting at half or less.

PHRubin Loc: Nashville TN USA

To make matters worse, when I upgraded from a T2i to an 80D, my Sigma 18-250 worked for only 1 week on the 80D even 'tho it still works on the T2i.

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Have you tried disabling the automatic format switching ?

I put an EF-s 10-22 on a FF and I still have about 3/4 of maximum pixel count at maximum wide angle.

Its very similar to Canons now-neglected H-format. An R6 would still be at 15MP. Zoomed to 12.5mm its the same view as APSC zoomed out to 10mm.

Acoarst some EF-s lenses have more extra coverage than others but the differences are never published.