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...
View ArticleDifferent 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 the...
View ArticleWhat tools and spare parts are needed to repair Canon 200mm f1:1.8 USM prime...
The focus of Canon 200mm f1:1.8 seems to be entirely USM driven. Manually rotating the black ring has no impact at all on mine, as it is broken. What toolset would be the best I could buy (from Amazon...
View ArticleDo 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...
View ArticleWhat tools and spare parts are needed to repair Canon 200mm f/1.8 USM prime...
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...
View ArticleWhich Nikon DSLRs have an autofocus motor in camera body?
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...
View ArticleWhy 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...
View ArticleWill any non-AF lens work on a Nikon camera with built in AF already in the...
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...
View ArticleDSLR 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...
View ArticleWhich 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...
View ArticleWhy does the lens motor in my Canon 400mm f/2.8L USM keep working even though...
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. Is...
View ArticleWhy are photos taken with my old lenses all out of focus on my new Nikon...
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,...
View ArticleDoes having an autofocus motor in body vs lens affect image stabilization or...
This question already has an answer here: How do camera body motors compare to in-lens motors for focusing? 4 answers Does “the same” lens, with different autofocus systems, have the same optical...
View ArticleMy lens's focus ring can be twisted past infinity and the close-focus stops...
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...
View ArticleDifference 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...
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