Questions tagged [focus-motor]

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30
votes
3answers
187k views

Why do higher end lenses use USM instead of STM?

Canon has a newer type of motor, called STM, which is introduced in lenses like 18-135 f/3.5-5.6 IS STM, 40 f/2.8 STM and so on. STM also provides quick, silent and smooth focusing. Even the focusing ...
13
votes
3answers
12k views

What is Nano USM and how does it compare to an STM or USM lens?

The Canon EF-S 18-135mm f/3.5-5.6 IS USM has a designation of Nano USM on the lens. What does this mean? What are the advantages of having it vs STM or USM? We have a terminology thread that usually ...
3
votes
3answers
9k views

STM vs Non STM lenses for still photography?

If I am looking for a lens for still photography , then does an STM lens have a benefit over non-STM lenses?
10
votes
3answers
1k views

What motor gets used if both lens and camera body have a focus motor?

If both a camera body and lens have motorized autofocus, would one be used over the other or would both work in tandem to speed the focus process along?
7
votes
1answer
2k views

Why are photos taken with my old lenses all out of focus on my new Nikon D5300 body?

My Nikon D80 died, and I was bought a new D5300, body only. All the photographs are out of focus when I use the lenses I used with my D80. Why would this be? I'm using the Sigma 18-50 f/3.5-5.6 DC, ...
3
votes
2answers
5k views

Do separate autofocus motors exist for entry level Nikon DSLRs?

I have a Nikon D3200, which doesn't have an autofocus motor. Therefore, I'm mostly deterred by lenses that don't have focus motors in them. But the ones that do have it are much more expensive. Take ...
7
votes
1answer
103k views

Which Nikon DSLRs have an autofocus motor in camera body? [closed]

I have a Nikon D3000 and a lens which has no autofocus motor. But under the lens, I have found a screw which rotates with the focusing control. My D3000 does not have any autofocus motor inside the ...
4
votes
1answer
2k views

What is an auto-focus motor?

I recently bought a Canon 550D, and I read it has an auto-focus motor, which not all cameras possess. I'd like to know what it is, and what I can do to keep it running smoothly; AFAIK the manual doesn'...
1
vote
1answer
1k views

Can I save money on lenses by buying a Nikon camera with an in-body autofocus motor?

I have dilemma what camera is better Nikon D5100 or D90. The first one is newer but the second one has lens servo ("screwdriver") motor. My question is: can I save some money overall with the more ...
0
votes
1answer
680 views

Does a Ring-Ultrasonic EF-S lens require power to manually focus? (using with adapter)

Would the manual-focus-ring of a ring-ultrasonic EF-S lens (in particular the 17-55mm f/2.8 IS USM lens) focus even when the electronics are not working? Or would it require power to allow manual ...
3
votes
3answers
1k views

Does having an autofocus motor in body vs lens affect image stabilization or image quality? [duplicate]

In terms of image quality and image stabilization, what difference does it make to have an autofocus motor in-body vs.in-lenses ? The question How do camera body motors compare to in-lens motors for ...
4
votes
5answers
6k views

Will any non-AF lens work on a Nikon camera with built in AF already in the camera body?

I want to purchase a camera with a built in autofocus motor, but I want to know if lenses without autofocus will then focus automatically on that camera body. In other words, can I buy a Nikon camera ...
3
votes
1answer
10k views

What happens to a lens when you turn the focus ring during AF mode?

What happens to a lens when you turn the focus ring during AF mode? I have read that this causes damage, or can cause damage. But what is actually happening? I've done this recently with my Canon EF ...
1
vote
1answer
12k views

What is the difference between STM and USM in a lens? [duplicate]

What is the difference between STM and USM in a lens? What's the major difference? Is this only for a Canon user, or Nikon, or else DSLR also having same types lenses? What should I choose for day-...
8
votes
2answers
1k views

What technical reasons prevent Canon's new hybrid AF working with non-STM lenses?

Canon's new Rebel T4i (a.k.a. EOS 650D) has a new "hybrid AF" mode, which allows continuous AF during video, but only when used with one of the new STM lenses. I've seen chatter on the web forums ...
6
votes
3answers
11k views

Do all Canon DSLRs have in-body AF motors?

Do all Canon DSLRs have autofocus motors? I've searched a lot but found mixed answers. Some sites say that no EOS body has a focus motor (and that all EF lenses have AF motors), but some say all EOS ...
2
votes
2answers
2k views

My lens's focus ring can be twisted past infinity and the close-focus stops without ever hitting a hard stop— is it defective?

I have a AF-S Nikkor 50mm 1:1.8 G lens which I use for my Nikon D3100 and D3300 cameras. Today, I noticed that the focus ring can be twisted past the infinity and 0.45m focus stops. It can be turned ...
-1
votes
1answer
2k views

Why is the autofocus not working on my Canon EF 70-200mm f/2.8 L IS II USM?

I bought the EF 70-200mm f/2.8 L IS II lens and the autofocus is not working. It's non-functional. I can use the lens in manual mode but not in autofocus. What could be the cause?