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Questions tagged [optical-quality]

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2
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4answers
465 views

Cheap, unbranded 85mm f/1.8 prime lenses - are they optically any good?

Has anyone tried or even considered the Chinese under-£100 85mm f/1.8 primes for hobbyist/non-pro photography? Of course, they are only manual focus and build quality will not be as good as their ...
1
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1answer
199 views

42.8mm on Nikon COOLPIX P7700 > 55mm on Canon EOS 77D? [duplicate]

I have a Nikon COOLPIX P7700 and because it has been losing function due to wear and tear after 6 years, and I wanted a better zoom range for wildlife, I decided to get a Canon 77D DSLR so I could get ...
1
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3answers
206 views

Homogeneity of a filter, when does it matter?

I read a review of circular polarizing filters in www.lenstip.com and one of the tests is to judge the homogeneity of the filters. Quote from the test explanation page: Homogeneity is a ...
10
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5answers
2k views

How can these photos by Martin Schoeller have such a high quality?

Today, I ended up in a site showing famous people faces in a very first plane. I just got impressed by the quality those photos had. What do you think are the factors you have to tweak to reach that ...
1
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3answers
530 views

Are high end rangefinder lenses better than SLR lenses? Would I notice?

I have been thinking about getting a Nikon Df, one of the factors being the reportedly excellent image quality possible. An alternative would be to get a high-end rangefinder, like the Contax G2. Ken ...
11
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4answers
7k views

How many optical aberration types are there in lenses? And what are they?

Everyone hears something about chromatic aberration but are there any other types? What causes them?
1
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1answer
204 views

Can my copy of this lens (Pentax DA 18-135) have problems?

I'm struggling with this lens since quite a bit, and I'm not able to understand if the lens have problems or I'm expecting too much. Surely it has a problem: it's never consistent. I've got shots ...
4
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3answers
1k views

What exactly “professional-grade” means in Nikon line of lenses?

I was researching a bit on Nikon 16-35mm f/4 lens. Both Nikon USA and India websites are silent about the build material of the lens barrel. There are a class of people, who either out of "frustration"...
1
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5answers
2k views

Maximum distance between the camera and a specified object when the object is still visible on the picture?

Theoretically, what is the minimum distance between the camera and an object, where the object begins to not be visible ? Suppose that a camera has f as focal distance and the sensor size 2/3" and the ...
2
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4answers
269 views

Since IQ is better at smaller apertures, and backgrounds can be blurred digitally, why not always shoot stopped down?

Is it correct to say that picture quality is better with small f number, but with very small DOF, this perfect quality degrades very quickly? So, is there any reason to shoot with wider aperture ...
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2answers
2k views

Why do camera phones have lenses of inferior quality?

I've heard that mobile phone cameras have lenses of inferior quality to those in DSLRs and point and shoot compact cameras. Is this true, and if so, why?
1
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1answer
79 views

Why can a lens still function when subject to severe physical degradation?

Consider the following two modifications to a camera lens: Obstructing the about 75% of the lens's front element with an opaque filter as shown here: https://www.youtube.com/watch?v=43W159gPpdQ. ...
3
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2answers
3k views

How to determine if a new lens is a subpar copy?

I have read some posts like the ones below about testing a lens to determine how well it performs optically. What I didn't see was anything on determining whether the lens performs as it should and is ...
14
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4answers
753 views

How to rate the optical quality of a used lens?

I've read that you can examine a lens for scratches and defects by holding the aperture ring at its lowest setting and shining a flashlight through the lens. When I do this, however, a lot of stuff ...
13
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6answers
8k views

Do lenses lose sharpness when they age?

I was reading this answer where it mentions, "..it's a lens that can lose sharpness as it ages.." and was wondering if this is true and if yes, true for all lenses. Reasons as to why this happens and ...
5
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2answers
1k views

What's the base f-stop when counting an ideal f-stop for lens?

I've read a lot around this site that an ideal quality of the lens is achieved when using f-stop roughly 2 stops slower than the fastest value of the lens. Firstly, I'm not exactly sure what "2 stops"...
3
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3answers
2k views

How does the Lensbaby Scout perform as a cheap fisheye lens?

I'm interested in the Lensbaby Scout since it seems like a cheap fish-eye option, but I am unsure how it performs. What about the lens's quality (build quality, image quality, and optical quality)?. ...
5
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2answers
158 views

Does “the same” lens, with different autofocus systems, have the same optical quality?

I'll give examples with Nikon only, but the question is pretty general. So, is this a fact or not? Examples: Nikkor 50/1.8G AF-S, Nikkor 50/1.8 AF-D and Nikkor 50/1.8 AF 70-300 AF and 70-300 AF-S ...
0
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1answer
318 views

Why picture quality decreasing with very big apperture? [duplicate]

Possible Duplicates: What is a “diffraction limit”? Why are my photos taken at f/11 less sharp than those taken at a wider aperture? I have made 3 landscape pictures with f/12, f/...
2
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3answers
564 views

Does the higher price lens always reflect better quality regardless of it being 3rd party or not?

When looking at various lenses you will see the camera manufacturer lenses made by the camera manufacturer. Then you will see other 3rd party lenses (Tamron, Sigma, etc). Does it pay to get the ...
7
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5answers
4k views

How much different are the Tamron 17-50mm f/2.8 stabilized (VC) and non-stabilized versions?

I have seen these 2 lenses being suggested by many people across the site as general purpose zooms and an upgrade to the typical 18-55mm kit lenses. The price difference seems to be around $200 (~INR ...
9
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3answers
390 views

What are the standard tests available to quantify lens parameters?

In some of the questions I have asked here, some of the terms frequently used to describe the difference in image quality between the cheaper lenses and the premium ones have been increased contrast, ...
17
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1answer
4k views

What is the “Newton Effect”?

I was just chatting with a photographer friend of mine, and he mentioned wanting "anti-newton glass"... I didn't know what that was, so I did a google search. I quickly figured out that it was ...