I owned this same lens in Canon EF-mount and when i moved from Canon to Sony I still used it with the MC-11 lens adapter.

It is a very good lens, but does not have the build of the Sport version that costs twice as much. IMHO the Sport version is way too heavy to handhold, and not any sharper, all testing showed that. The Contemporary Version is much lighter and easily handholdable, and I loved that.

When you get your estimates, IMHO if the estimates to fix it are within $100-200 of the current $899 new price, get the new one. Don't get sentimentally attached to a used lens that has been repaired if the cost is close. A new one gives you a new 4-year USA Sigma warranty, and that in the long run is worth any close difference in cost.
https://www.sigmaphoto.com/support/services#:~:text=Service%20Policies-,Product%20Warrant

If it is just a couple hundred to fix it, then by all means do so. But my guess is it will be more, as labor costs alone can add up, beyond any parts needed.

Cheers and best to you.

I agree that carrying the sport lens all day can be a nuisance but I like the sturdier build and the weather sealing.

Wont be using it much anymore as I finally got the Nikon Z400f2.8 lens. Its a little bit heavier but not much and is way faster focusing.

Will probably only use the Sigma sport now whe. I want two cameras with big lenses like maybe when shooting baseball.

Glad Sony works for you. I like the bigger body the Z9 gives you but thats just my opinion and not necessarily worth much.

Good for you and your muscles. I extensively tried them both and I hated handholding the Sport version as did most testers, just a fact that you can check in the many review videos. Also hated lugging that Sport version around in the field.

I could easily have afforded the Sport version, but did my real-world research and chose the Contemporary version which actually tested a bit sharper, and held its wider aperture longer as you zoomed over the Sport version, and is lighter, at 4.3 pounds., just a fact. The 6.3 pounds of the Sport version is ridiculous IMHO, sorry, especially when trying to follow BIF, other fast wildlife, and fast sports action. It weighs about as much as the Sony 600mm f4 GM prime lens, crazy.

From ImprovePhotography:

" Weight & Size
The Sigma 150-600mm f/5-6.3mm Sport lens weighs significantly more than the Contemporary version.

The Contemporary weighs 4.3 pounds (1.95 kilos) and the Sport weighs 6.3 pounds (2.86 kilos).

Just because I'm hungry right now, I'll put that in terms I can better relate to.

The Contemporary lens weighs the same as 8 Krispy Kreme Donuts, and the Sport weighs as much as a Chihuahua with 3 bananas on its back.

I don't eat dogs.

In a practical shooting situation, I have to say that the difference in weight is dramatic.

In wildlife photography situations where I was mostly driving around and pulling over for a quick shot of animals as I saw them, the weight of the Sport didn't bother me much.

However, when I had to walk any distance while carrying the lenses, the extra weight of the Chihuahua on my lens made it unbearable to carry around.

Worse, there were times when shooting birds in Florida that I didn't bring the heavier lens with me because it was too much of a nuisance.

Unless you're only shooting on a tripod and traveling with the lens in a car (not toting it around in a camera backpack), I highly recommend the Sigma Contemporary lens.

It's so lightweight that it makes wildlife photography a lot more fun. #DitchTheChihuahua

The physical size of the Sport is longer than the Contemporary by 1.2 inches (3.5 cm).

It's always nice to have shorter lenses since they are more convenient as long as the focal length is the same.

But I can't imagine 1.2 inches making much of a difference one way or the other.

However, this difference in the physical length also affects the way the lenses are engineered, and means that the Sport version has a larger front element which requires 105mm filters, while the Contemporary takes 95mm filters.

This, too, is rather inconsequential because it's unlikely that wildlife and sports photographers would use filters very frequently.

Sports photographers would probably never use them, but sometimes wildlife photographers use a polarizer to cut the reflections and glare off leaves. " (end quote)

Not an issue for me now, as I moved to Sony and can handhold the Sony 200-600mm lens all day long at 4.6 pounds.

Cheers and best to you.

Use what works for you and be happy.

As a working professional photojournalist for over 50 years, covering all subjects around the world including war conflict , I owned and used all those heavy big bricks from Nikon and Canon. It is such a pleasure to have the lighter , yet sturdy professional gear from Sony mirrorless. I miss nothing about those big and heavy bricks, and I will never go back to those big integrated grip bricks again, ever.

Many of my fellow pros that used Z9 as their main bodies are thrilled to now be able to use lighter, smaller Z8 now, especially those shooters that carry multiple bodies on long shoots.

I used my Sigma Art Contemporary 150-600mm Canon EF-mount Lens in poor weather without any issues, it was weather sealed enough. I think the OP will stick with his Canon gear and either a repaired or new Sigma Contemporary lens.

Cheers and best to you.

Use what works for you and be happy.

As a working professional photojournalist for over 50 years, covering all subjects around the world including war conflict , I owned and used all those heavy big bricks from Nikon and Canon. It is such a pleasure to have the lighter , yet sturdy professional gear from Sony mirrorless. I miss nothing about those big and heavy bricks, and I will never go back to those big integrated grip bricks again, ever.

Many of my fellow pros that used Z9 as their main bodies are thrilled to now be able to use lighter, smaller Z8 now, especially those shooters that carry multiple bodies on long shoots.

I used my Sigma Art Contemporary 150-600mm Canon EF-mount Lens in poor weather without any issues, it was weather sealed enough. I think the OP will stick with his Canon gear and either a repaired or new Sigma Contemporary lens.

Cheers and best to you.

Got a Sigma 150-600mm Contemporary lens (Canon EF Mount) a few years ago. The other day when out shooting with it. I got a error 01 with it. Cleaning the contacts on both the lens and camera body did not help. When I got back home and tried the lens on one of my other bodies I got the same error 01. Looking at the lens itself I noticed is no longer is wide open when looking at the shutter. It looks like it is still open to the f/9 that I was using when the error occurred.

Do you think that this lens is worth fixing and where would you send it to be fixed? Are there good 3rd party repair businesses or should I just send it to Sigma? How much would you spend to have it repaired 25%, 50%, 75% of the replacement cost of the lens. It looks like a used lens would run about $800.00 (Like new condition)

The reason I have and want to keep the EF mount lens is because I have several older dSLR bodies including my R50. I want to be able to use the lens with any of them.

This is the first time I have ever had a lens die and it is a bummer for sure.

Thanks in advance for your comments and reasonable suggestions.

UPDATE:

Of the many forms I submitted for a repair estimates for the lens only three companies have responded so far and they are CameraSolutions in Portland, OR., Advance Camera Repair in Joliet, IL. and Perfect Image in Lancaster, PA. SO far even Sigma, has not responded to a request for repair estimate.

Of the three that responded - Advance Camera Repair in Joliet, IL said "We would be happy to take a look at your camera. We will have to see it to confirm the problems and give you the proper estimate. We provide a free estimate in 1 day . The repair time normally is 7 days."

Camera Solutions in Portland said "Thanks for reaching out! That is a common issue with these lenses after a certain point. If I remember correctly, its probably the aperture unit, or a bad flex cable in the lens. 

Feel free to drop by the store when you have some time to drop it off. We take a $24 deposit and our turn around for repair is about 2-3 weeks. I can ask a technician for a rough estimate when you get here. They are not in at the time of me responding to you. After, we will take it apart, diagnose, send you an estimate and you can say yes or no from there. "

and Perfect Image said - "Thanks for contacting us! It sounds like the aperture unit in the lens has either failed, or the electronics controlling it have. We cannot get the service tools required to properly work on that lens, so we would have to send it to Sigma for service. It would most likely cost between $200 and $450 to repair. Sigma would provide a more accurate estimate before starting any repairs. If you have any questions feel free to reply to this message. Thanks again and have a great day!"

All gave me a name and phone number to contact them should/if I had questions.

The closest place to have it repaired is in Portland which is a 200 mile round trip. The others would all have to have the lens packed and shipped.