There are a couple of ways to discuss gear.
1. Cite the qualities of a particular piece of gear and how it relates to the photographic process. Aspects of performance such as DR, color rendition, noise, resolution all are discussed in the context of how they relate
to particular subject matter and/or styles of photography . The intent of the discussion is to point out how a particular set of gear can facilitate and improve photography.
The intent is important because what may be "unacceptable" to someone doing landscapes intended for big enlargements, or product photography,
is acceptable for a photojournalist or someone doing conceptual work. The person shooting fashion models to advertise cosmetics certainly wants as clean and sharp an image as possible (which ironically will undergo extensive retouching to make the model as flawless as possible). However, the photojournalist will be less concerned with details of IQ than with the handling and performance of the camera itself.
The goal of the photographic process-impact of the image on the viewer-is the focus of the discussion of the gear.
2. Compare charts and lab test results for the purpose of demonstrating the
potential worth of a camera or lens. A presumably objective standard is applied which doesn't take the intent of the user into account. Aspects of actual performance and image quality are deemed superior or inferior without regard for the intent of the photographer (final display method, purpose of the photo, etc).
Intent isn't important because the photographs taken by the gear in question are judged not on their own merits, but on how they reflect the quality of the gear. While ostensibly this can be assumed to have the intent of the photographer in mind, too often this type of discussion either leaves that intent out of the discussion, or narrowly defines it to genres and display methods which support the conclusion of the lab tests. Somewhat circular thinking is involved when one says "Pros would prefer this result" based on thinking in terms of only certain professional applications.
Yes, a professional fashion photographer would prefer the results from a large FF camera such as the EOS 1D. A photojournalist would prefer using a much smaller camera, even if the resultant IQ is lower.
3. "Gear P*ssing Contest" No purpose other than to prove Brand X is better than Brand Y. Actual pictures are irrelevant as the charts and test results are all that is needed for proof. A subcategory of this is "I know more about digital photography than you do posts". Minutiae of specifications and mathematical theory are belabored, again without a single image involved to demonstrate the person's competency, or even level of involvement, in photography beyond discussing gear.
There are also a couple of ways to post photos.
1. Post an image with the intent of showing the capabilities of a given camera and/or lens, when used by someone competent not only in the technical aspects of the gear, but in composition and artistic expression. "Wow, that's a great photo you took with your Olympus".
2. Post an image as part of an explanation of how to use equipment to best effect. "Ok, I can see how you used those settings to reduce the noise shooting at that light level."
3. Post an image looking for feedback as to the poster's competency with the equipment. This can be done in two ways. First, posting a photo along with description of equipment used, settings, etc. with questions as to whether the image could be improved by changing the equipment and settings used. This is the preferrable way. Second, just post the pick and hope someone points out how it could be improved. Not the best way, since people may not guess whether you are asking how to improve the photo or just trying to show off what may or may not be quality images.
4. "Look at my new camera/lens" images. Most of us get excited by our new toys and want to show them off. Kind of like showing everyone at work photos of the new baby.
5. Post a 100% crop to prove how superior or inferior a piece of equipment is. Doesn't matter if the image is artistically/compositionally boring, or even poorly done. No one can really tell anyway because it would take a 30" monitor to display the whole thing. What is important is pointing out chroma noise, or CA, or purple fringing, or whatever other things only noticeable in 100% crops but basically irrelevant in an 11X14 at normal viewing distance.
It's up to each person to decide which of these categories suits his/her fancy. It's also the right of others to feel a given category is a waste of their time. Like it or not, we are all free to choose a given category. Like it or not, on a public forum we should expect responses we may not like.
An important thing to remember is that often, if someone disagrees with you it doesn't mean they think you are inferior. It simply means they disagree with you.
Now, I'm going to take this soapbox and use it as a prop for some photos... ;-)
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http://saro_shots.photoshop.com