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0answers
64 views

Difference of auto-focus motor?

What is the difference of ultrasonic motor, stepper motor, and electromagnetic drive? Which one of these are lens-based or screwdrive? What are the advantages of lens-based servo over screwdrive and ...
2
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1answer
64 views

What are the (dis)advantages of moving the entire lens for focusing vs. only parts of it?

There's a lens adapter available that adapts Leica lenses to Sony mirrorless cameras. It's called TECHART PRO. The key feature is that it allows to use autofocus with the manual lenses. This works by ...
3
votes
2answers
151 views

Why does a manual focus lens have an autofocus motor?

Can someone explain to me why the Rokinon 24mm lens has a focus motor? Quoting from LensHero's page on the lens: Generic motor built-in focus motor From what I understand, only autofocus lenses ...
7
votes
1answer
904 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 ...
2
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2answers
327 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 ...
0
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1answer
126 views

Does the EF-S 18-55 STM make noise when it autofocuses? [closed]

I'm planning on buying a Canon 70D with the kit lens, an 18-55mm IS STM lens, to film tutorial-style videos (and for other purposes as well). I know that sometimes you can hear cameras autofocusing in ...
0
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3answers
239 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 ...
7
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1answer
1k 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, ...
0
votes
1answer
132 views

Why does the lens motor in my Canon 400mm f/2.8L USM keep working even though I've got focus?

I've just bought a Canon EF 400mm f/2.8 USM IS, and although I have perfect focus, the USM still works. It also works when I press the shutter button halfway. But I set the focus to another button. ...
3
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4answers
1k 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 ...
12
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2answers
17k 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 ...
1
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2answers
2k views

DSLR in AF mode. Do we need to use Focus ring on lens?

My camera is in Auto Focus mode (AF). As my understanding, the camera will focus on subject automatically. But when I rotate the focus ring, the focus subject points will change, too. I don't ...
5
votes
1answer
41k 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 ...
3
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2answers
2k 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 ...
2
votes
1answer
84 views

Different focusing speed on different AF-D lenses?

AF-D lenses use the body motor, so how is this possible? Of course, I'm talking about lenses with the same focal length & min distance. For example - Nikkor 80-200 AF-D - the 2 ring version and ...
4
votes
2answers
1k views

What tools and spare parts are needed to repair Canon 200mm f/1.8 USM prime lens?

The focus of Canon 200mm f/1.8 L seems to be entirely USM driven. Manually rotating the black ring has no impact at all on mine, as it is broken. What tool set would be the best I could buy (from ...
3
votes
1answer
5k 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
787 views

Misfunction of Canon EF 50mm f/1.8 on manual focus?

I have a Canon T3i (600d) and two lenses: EF-S 18-135mm and EF 50mm f/1.8. While working with manual focus, I can shoot out of focus (on purpose) with the 18-135 (as expected). But with the EF 50mm, ...
1
vote
2answers
3k views

What kind of AF-motor does a Nikon D7000 body have?

I am a novice in the SLR photography world and am going to buy my first camera. I intend to take occasional videos. I guess if the AF-motor is screw and gear type, the clicking noise will ruin the ...
1
vote
1answer
266 views

Can I use a Cosina AF 28-300mm f/4-6.3 with a Nikon D5100 if I focus manually?

The Cosina AF 28-300mm is an autofocus zoom for Nikon F-mount (body must have AF motor). Can I still use it with the D5100, provide that I will have to manual focus?
4
votes
2answers
984 views

Can I control if the in-body AF motor is used instead of the lens AF motor on my Nikon?

I have Nikon D7000 with 18-105mm. I know that the camera body has the AF motor and the lens itself has the AF motor too. I was wondering can I control which AF motor should be used while autofocusing. ...
2
votes
1answer
1k views

Why does my D70s no longer focus my Nikkor 70-300, but still focuses the 18-70?

At first I thought my lens was dead but after switching to my other D70s it worked fine. So, here's the issue: One of my D70s bodies can no longer auto-focus my Nikkor 70-300 lens. Switch to a 18-70 ...
1
vote
3answers
1k views

SLR camera with inbody motor verse AF- S lens [duplicate]

Possible Duplicate: How do camera body motors compare to in-lens motors for focusing? Can I save money on lenses by buying a Nikon camera with an in-body autofocus motor? I would like to ...
1
vote
2answers
1k views

Why can't AF-S lens (with broken auto-focus) work with bodies that have build-in motor?

Background: I have a Nikkor 70-300 AF-S G. Somehow, the VR and AF systems stopped working.. It was working perfectly fine, then for 2-3 months it stayed inside the bag, in a wardrobe, without even ...
3
votes
5answers
412 views

Do all cameras with autofocus need motors?

Do all autofocus cameras need motors to drive the lens? I would have thought today's modern electronics rendered motors obsolete.
8
votes
2answers
999 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 ...
4
votes
2answers
790 views

What would cause a Pentax SDM lens to stop autofocusing, and what can I do?

I've read many reports that the SDM autofocus motor in some Pentax lenses may stop working after several months or years of use. Why does this happen, and is there anything I can do to prevent ...
6
votes
1answer
485 views

How do ultrasonic motors allow continuous manual focus?

I understand the basic pros and cons of ultrasonic lens motors — called USM by Canon, SDM by Pentax, or SWM by Nikon. One of the chief benefits is that they allow "always on" manual focusing — you don'...
1
vote
1answer
531 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 ...
4
votes
1answer
903 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'...
9
votes
3answers
794 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?