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1
vote
0answers
40 views

Nikon 16-85 VR focus noise problem?

My 16-85 VR is doing some weird noise during focus, manual or auto. It's like an hiss. I asked in a local shop and they said it can be some microdust inside the lens. But I'm a little worried it can ...
1
vote
1answer
123 views

Why do I see different focuspoint in my DSLR's viewfinder and screen with old lenses?

I've had an old completely analog Praktika SLR with a set of lenses for a few years now. The camera and lenses are still quite good but I wanted to go digital. Having recently acquired a Nikon D5200, ...
2
votes
2answers
132 views

What would appear on polaroid film exposed without a lens?

I am trying to get a better understanding how lenses & focusing works. Let's say that I am standing in a completely dark room holding a unexposed polaroid film, and turn on a TV in the other ...
1
vote
2answers
220 views

Help me understand effective f-number

If I set a lens to, say, f/2 but my focus is set to its closest point, my effective f-number won't be f/2 any more but it will be higher by a factor that depends on focal length, image magnification ...
0
votes
1answer
159 views

Canon lens FD 50mm 1:1.4 with Canon Rebel T3i - no focus

I am trying to use an old FD 50mm lens with my Rebel T3i camera but cant get focus. Is there any configuration on the camera I havo to make or it just don't work at all? Thanks!
2
votes
1answer
293 views

Why do some lenses focus past infinity?

On the kit 18-55 lens that came with my Nikon D5100 I have noticed that when trying to focus on infinity for shots in dark conditions (star-trails, etc) the lense tends to move past infinity out of ...
5
votes
2answers
444 views

How can I quickly tell without testing if my lens is parfocal or varifocal?

I have read a couple of related questions, but I am curious to find out if there is a list of parfocal/varifocal lenses out there. I'm most concerned with the lenses I have and I would like to know ...
6
votes
1answer
313 views

When focusing at max zoom, focus is lost after zooming out. Is that normal?

On my Canon kit lens, I could completely zoom in, focus on the object and then zoom out to take the picture with the object still in focus. Now I have a Sigma 18-200mm (with a Canon 600D) and that ...
1
vote
2answers
292 views

What does it mean for a telecentric lens to be focused to infinity?

I have a question about a telecentric lens Ive been studying (for physics research!) and was wondering if you guys could help clear some cobwebs in my head. For starters, I am simplifying the TC lens ...
5
votes
2answers
179 views

Why do the Nikkor non-AI 135mm vs 50mm f/1.8 work differently when I look directly through the lens?

I recently purchased an old Nikkor 135 f/2.8 non-AI lens. Beautiful lens, but the closest focal distance is about five feet. I noticed that it will 'focus' at about 4 inches as well. If I hold the ...
3
votes
2answers
2k views

What does “Flat Field Focus” mean?

Looking at lenses, specifically sigma macro lenses, I noticed that it had a ""Flat Field" front lens element". What does this mean? And how is it different to the norm?
2
votes
2answers
318 views

Why is my lens focusing sound lounder than before?

I'm new to DSLR camera. I didn't mount a lens properly. The camera still allowed me to take photos, so I didn't notice the error. After I had been using it for 10 minutes I noticed my error and ...
8
votes
3answers
913 views

Easier ways to pre focus a distance on a lens without manual focusing meter?

In applying zone focus(focusing at particular distance in advance, before the subject comes in) to shoot a bike that will come into frame, how do I correctly focus at a particular distance with a lens ...
3
votes
2answers
648 views

All my photos were blurry

I recently did a shoot of a baby and my 6 year old son, and I got some fantastic shots that were super sharp. I then did another shoot of a 6 year old and toddler and every single photo was slightly ...
17
votes
2answers
1k views

What makes the focus ring on a lens go smoothly?

I’m curious about the smooth movement of the zoom or focus rings on a lens. How is the smooth movement done? Is there some kind of liquid with high viscosity? That doesn’t sound very probable. On the ...
4
votes
4answers
405 views

How can I make close-by objects appear as if they were much bigger?

We all know the popular Tilt Shift technique that gives objects a "miniature" look, making them appear much smaller than they actually are. I'm wondering whether it's possible to achieve the opposite ...
6
votes
3answers
2k views

What are “Depth of field and focus scales”?

I'm reading Kurt Munger's review of SAL75300 (Sony's 75-300mm F/4.5-5.6 lens) and I noticed the entry "Depth of field and focus scales? Nothing" in his summary table. Now, I know what depth of field ...
8
votes
4answers
3k views

Is it difficult to focus on 1.4F prime lens, and if it is how to counter that?

Does difficulty in focusing have anything to do with 1.4F (Nikon G)? Will it be still difficult if I use manual focus? Is auto focus too slow? Is there a way to counter it? This example photo (from ...
2
votes
2answers
307 views

How can I find which lenses have “Continuous manual focus”?

Canon lenses with USM auto focus can be called "continuous manual focus" (at least some). By this I mean that you can override the AF without switching it off. I've found this very handy, and I often ...
4
votes
2answers
1k views

Is it normal for focal length to change while focusing?

When I change the focus distance on my Pentax 55-300mm lens, the focal length appears to change. More specifically, the lens appears to zoom in as I focus towards the minimum focusing distance. This ...
8
votes
4answers
2k views

How can I get maximum DoF with no distance markers?

I am aware of what hyperfocal distance is and the general principles behind it. However, most of the tutorials I have seen and read regarding it make use of lenses with focus distance indicators. ...
12
votes
2answers
699 views

Does a crop sensor affect closest focusing distance? Why does it not affect focal length in EXIF data?

Since I am considering to buy the Nikkor 105mm micro VR, I wondered if the cropped sensor does affect the closest focusing distance of 0.31m? Thinking about this, the following additional (and ...
11
votes
1answer
3k views

What is a focus limiter?

What is a focus limiter and how does it work? What is the advantage of it? For instance Tamron 90/2.8 Macro has a focus limiter. According to the documentation: In the limit position, the Tamron ...
12
votes
4answers
757 views

How close can a lens focus?

From my understanding, if you want to do some macro photography it is better to have a lens that can focus when it is really close to the subject. Sometimes people buy extension tubes to help them ...
6
votes
2answers
205 views

Can a hard impact foul up a lens' focus?

Recently, a camera with lens attached got knocked off a chair and hit the floor (not my gear, fortunately!). Following that, the lens would not focus properly, either with manual focus or auto. The ...
21
votes
3answers
5k views

How can a 18-55mm lens focus on objects beyond 55mm?

I guess this is a total noob question, but doesn't 18-55mm mean that it can focus only up to 55mm?
19
votes
2answers
1k views

Why am I allowed to turn my focusing ring beyond infinity?

Is there a good reason why I can turn the focusing ring on my lenses beyond infinity mark on focusing scale? Following recent questions here and here, it sounds like a real usability issue. ...
27
votes
4answers
35k views

What is back-focusing?

What is back-focusing? Is it something I need to be worried about, or can I just live with it? How can I tell if my camera/lens is sufferring from it?
24
votes
6answers
4k views

Can I damage the focus system by turning the focus ring when the lens isn't mounted?

I have a couple lenses that don't have an internal focusing system, and whenever I want to put them back in my bag, I turn the focus ring to make the lens shorter. I noticed that when the lens is set ...