topic Re: Canon 75-300m Lens not focusing in EF & RF Lenses

Canon 75-300m Lens not focusing

Blake1 — Wed, 09 Aug 2023 18:00:11 GMT

I recently bought a new lens, and it doesn’t seem to be focusing. The focus moves when I try to zoom in or out. When I use auto-focus, the lens focuses only when I’m zoomed out. When I'm zoomed in, it will only jitter back and forth.

Re: Canon 75-300m Lens not focusing

deebatman316 — Wed, 09 Aug 2023 18:03:16 GMT

Return the lens for a refund. It shouldn't be broken. That's Canon's worst lens made. It's poor optically, lacks IS and uses slow Micro Motor AF motors l.

Re: Canon 75-300m Lens not focusing

Blake1 — Wed, 09 Aug 2023 19:00:09 GMT

What about the 70-300

Re: Canon 75-300m Lens not focusing

deebatman316 — Wed, 09 Aug 2023 19:03:53 GMT

From who Canon or 3rd Party. Canon has made 3 different models. One was a professional grade "L" lens. The other 2 are consumer grade. The current version II of the consumer grade lens is good. But what is your budget though.

Re: Canon 75-300m Lens not focusing

Tronhard — Wed, 09 Aug 2023 19:50:14 GMT

TO DEMETRIUS:

The OP has a 75-300, not the 70-300 to which I think you are referring when you talk about an L lens. By now I am sure you are aware that I have a very low opinion of the 75-300. That said, it's still supposed to autofocus. It may be the lens, or the camera may not be getting sufficient contrast to make that focus, or it may be too close to the subject for the level of zoom. We need more information.

To BLAKE:

To clarify your situation, can you please advise what types of subjects you are trying to focus on and

how close you are to them when you have difficulty in getting a focus lock

Re: Canon 75-300m Lens not focusing

deebatman316 — Wed, 09 Aug 2023 19:53:22 GMT

The OP later asked about a 70-300mm lens. So I was not responding to the original 75-300mm lens that they mentioned.

Re: Canon 75-300m Lens not focusing

Tronhard — Wed, 09 Aug 2023 19:55:26 GMT

OK sorry Demetrius, I was confused - there is no sign of that interchange on the screen I am looking at, just the OP and your two responses before mine.

Re: Canon 75-300m Lens not focusing

deebatman316 — Wed, 09 Aug 2023 19:59:08 GMT

As to the other part AF issues. I'm not on my usual computer where I can see the whole post. I'm currently on vacation so I'm using my phone. So I can only get a limited view of the post.

Re: Canon 75-300m Lens not focusing

Tronhard — Wed, 09 Aug 2023 20:50:55 GMT

@BLAKE1

Since you have made inquiries about the 70-300 lens, I thought you might find this useful:
70-300 Canon Lenses In-Depth Analysis - Canon Community

However, I think it would be helpful to know what camera you are using, your focus mode (spot, area, etc.) and distance to the subjects you are trying to focus on. The issue may not lie with the lens.

Re: Canon 75-300m Lens not focusing

Tronhard — Wed, 09 Aug 2023 20:01:28 GMT

Lucky you to be on vacation!! Where are you holidaying?

Re: Canon 75-300m Lens not focusing

deebatman316 — Wed, 09 Aug 2023 20:09:55 GMT

The U.S. Virgin Islands 🇺🇲🇻🇮. If you ever visit make sure you drive on the left. This is the only place under U.S. control to drive on the left. But the steering is also on the left like every other car in the U.S.

Re: Canon 75-300m Lens not focusing

Tronhard — Wed, 09 Aug 2023 20:13:22 GMT

Sadly, it is unlikely I shall get the opportunity to do so, but it is an interesting situation! I hope you have a great holiday. BTW, the post you referred to from the OP finally appeared - why the delay is beyond me...

Re: Canon 75-300m Lens not focusing

deebatman316 — Wed, 09 Aug 2023 20:24:57 GMT

Well that's a good sign then. Hopefully ALL of the posts appear then without any problems.