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oceanphysics

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Posts posted by oceanphysics

  1. <i>There are a number of different types of distortion - the only one that really of any particular relevance with these two lenses is perspective distortion.</i>

    <p>

    Says who? Both lenses will no doubt exhibit some level of barrel distortion, and it is a legitimate question to ask which exhibits more.

  2. Don't know about the lenses in question, but you need to be aware that there are two very different meanings of "distortion" when it comes to wide angle lenses.

     

    First there is actual barrel distortion, which is a limitation of a particular lens design that causes straight lines to bend into curves. And there is perspective "distortion," which is geometrically inevitable when shooting with wide angle lenses. It exaggerates perspective and makes receding parallel lines converge more quickly, but does not bend straight lines into curves. It's responsible for exaggerating the keystoning of buildings you see when the camera is pointed upward rather than being kept level with the ground.

     

    The former will vary with lens design. The latter will be the same with the same focal length on the same format.

  3. <i>This beneficial because it gives more choice to the consumer.</i>

    <p>

    What an unbelievable load. Being forced to buy at MSRP is hardly "more choice."

    <p>

    What it's really about is eliminating choice and competition at the retail level. You'll pay enough to support a full-service low-volume boutique retailer occupying expensive space in a fancy mall whether you actually buy there, or at a more efficient big-box store, or mail order.

  4. It's certainly not a matter of "manufacturing tolerances." That term implies that different lenses coming off the line would have noticeably different focal lengths, which is certainly not the case.

     

    It's marketing and has already been mentioned, the fact that some lenses are only at their nominal focal length when focused at infinity.

  5. <i>All snakes will avoid you if possible</i>

    <p>

    Not all. Eastern (and from what I understand Western) diamondbacks will just as often stand their ground, but fortunately there aren't any in GSMNP. Cottonmouths can be similarly hardheaded.

  6. <i>has panned the M8 as being several generations behind the latest DSLRs (and even the little Sony XTi) in both image quality and electronics. Quite possibly true, but quite unfair, I think.</i>

    <p>

    I have no idea if it's true or not. But if it's true, I don't see how it could possibly be unfair to point it out. Does Leica suck so badly as a company that they need special consideration in reviews? And there's some reason they should get it?

  7. There are two 28-105's. The f/3.5-4.5 is an excellent consumer zoom. The f/4-5.6 I haven't tried, but judging by the price, it's likely junk.

     

    Other consumer zooms aren't going to be noticeably better than the f/3.5-4.5. However, you might consider something that starts wider than 28mm, or that has image stabilization.

  8. Based on what? The fact that no logo is visible, the camera is never mentioned, and is nearly unidentifiable? If were a placement the photographer would be wearing it around his neck when he was interviewed.

     

    There's no reason it shouldn't have been used. It's perfectly capable. What's with all the celeb-photographer jock-sniffing on this forum lately anyway? A good photographer can get good results with whatever they want to use. And if you're not, it it's not the camera.

  9. The 2-element ones work really well with long lenses. I don't know anything about Hama. I was under the impression that Canon and Nikon make the only 2-element ones, and they cost $50-80. If the Hamas are much cheaper then they're probably single-element, in which case I wouldn't bother.
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