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Thread: About lens....

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    Senior Member zoossh's Avatar
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    Default About lens....

    2 newbie questions regarding buying lens:

    1. is the max aperture size related at all to the quality of lens? in another words, is it always true that if i buy a F/2.8 max aperture lens to shoot at F/8, its quality will always or most probably or mostly be better than say a F/4.5-5.6 max aperture lens also shooting at F/8?

    2. is it always true that the lesser the lens groups and elements, the better the quality? how true is that?

    let's say if i used a nikkor AF 70-300mm f/4-5.6G with less construction than the 18-200mm, both of which i shoot at maybe 100mm focal length. would the 70-300mm be better if the lens groups and elements is lesser?

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    Default Re: About lens....

    interesting question, any expert can advise? I would like to know too!

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    Default Re: About lens....

    Quote Originally Posted by zoossh
    2 newbie questions regarding buying lens:

    1. is the max aperture size related at all to the quality of lens? in another words, is it always true that if i buy a F/2.8 max aperture lens to shoot at F/8, its quality will always or most probably or mostly be better than say a F/4.5-5.6 max aperture lens also shooting at F/8?

    2. is it always true that the lesser the lens groups and elements, the better the quality? how true is that?

    let's say if i used a nikkor AF 70-300mm f/4-5.6G with less construction than the 18-200mm, both of which i shoot at maybe 100mm focal length. would the 70-300mm be better if the lens groups and elements is lesser?
    1. First answer: depends, but most constant f2.8 lens are all the legendary lenses of the manufacturer, so most of them acan produce very good quality images.

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    Default Re: About lens....

    more elements juz means more prone to flairing. the 70-200vr is 21/19 but its still the best in its range.

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    Default Re: About lens....

    My take in BLUE.

    COCOA.

    [QUOTE=zoossh]2 newbie questions regarding buying lens:

    1. is the max aperture size related at all to the quality of lens? in another words, is it always true that if i buy a F/2.8 max aperture lens to shoot at F/8, its quality will always or most probably or mostly be better than say a F/4.5-5.6 max aperture lens also shooting at F/8?

    >>In a way, YES. Most lenses have best performance at 2-3 stops down from their widest aperture. So, an f2.8 lens would peak at F5.6 or F8. At f8, it would usually outperform a small/variable aperture lens (f4.5/5.6 type) set also at f8.

    2. is it always true that the lesser the lens groups and elements, the better the quality? how true is that?

    >>the one with lesser no. of lens groups/elements usually has higher contrast. However, with good design and special glasses, the one with more elements/groups could have better overall optical quality (eg. resolution and distortion) as compared to a simpler design (one with less elements/groups). So, it depends.

    let's say if i used a nikkor AF 70-300mm f/4-5.6G with less construction than the 18-200mm, both of which i shoot at maybe 100mm focal length. would the 70-300mm be better if the lens groups and elements is lesser?
    [QUOTE]

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    Default Re: About lens....

    1) Generally speaking, yes. Large aperture lenses are generally more expensive and are designed for the high end segment. Consequently they are of superior construction and optical quality. With regards to image quality, yes what cocoa said is true.

    2) Not really... really depends. Some lens elements serve special purposes, such as fluorite elements which reduce CA, or IS units. These elements serve to enhance image quality in lenses which stretch the optical limits of the lens contruction. So its not quite accurate to say that a lens with fewer elements produces better image quality.

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    Senior Member zoossh's Avatar
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    Default Re: About lens....

    Quote Originally Posted by cocoa
    >>In a way, YES. Most lenses have best performance at 2-3 stops down from their widest aperture. So, an f2.8 lens would peak at F5.6 or F8. At f8, it would usually outperform a small/variable aperture lens (f4.5/5.6 type) set also at f8.
    Does that mean that an F/2.8 lens peak performance at F/5.6 or F/8 while F/4.5 lens peak performance at a much smaller aperture size?
    Last edited by zoossh; 21st January 2006 at 12:12 AM.

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    Senior Member zoossh's Avatar
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    Default Re: About lens....

    Quote Originally Posted by solarii
    2) Not really... really depends. Some lens elements serve special purposes, such as fluorite elements which reduce CA, or IS units. These elements serve to enhance image quality in lenses which stretch the optical limits of the lens contruction. So its not quite accurate to say that a lens with fewer elements produces better image quality.
    i.e. lesser elements is just one factor, and not reliable as a sole factor?

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    Default Re: About lens....

    Quote Originally Posted by zoossh
    i.e. lesser elements is just one factor, and not reliable as a sole factor?
    To be frank I judge the lens as a whole... the final image quality. I don't care how many elements the lens has so long as its sharp. There are other test/assessment methods for lenses which are far more reliable... read the many reviews available on the web. Nobody cares how many elements there are... its merely a statisitc. Whats important is how the lens performs at the various focal lengths... centre/edge sharpness, CA, distortions etc.

    By the way, who taught you to count the elements? Referrring the eg you quoted in the thread starter... there's no way to tell which is better by simply counting elements. Its not even an indication. Tests have to be done to come to a conclusion.
    Last edited by solarii; 21st January 2006 at 12:35 AM.

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    Default Re: About lens....

    in d pass lenses technology not so gd less glass = less flare. now times hav changed le mah...

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    Senior Member zoossh's Avatar
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    Default Re: About lens....

    Quote Originally Posted by solarii
    By the way, who taught you to count the elements? Referrring the eg you quoted in the thread starter... there's no way to tell which is better by simply counting elements. Its not even an indication. Tests have to be done to come to a conclusion.
    newbie a lot of misconceptions. i'm expanding on my range and so are now looking at new lens. as they are not cheap, need to understand better on what i'm buying. considering nikkor 18-200mm to replace my kit lens 18-55mm (might be selling it off) if 18-200mm is better than 18-55mm in all or most aspects. also have sigma 10-20mm to cover wide angle and nikkor 50mm F1.8 to cover fast lowlight shots or narrow DOF shots.

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    Senior Member yyD70S's Avatar
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    Default Re: About lens....

    Quote Originally Posted by zoossh
    newbie a lot of misconceptions. i'm expanding on my range and so are now looking at new lens. as they are not cheap, need to understand better on what i'm buying. considering nikkor 18-200mm to replace my kit lens 18-55mm (might be selling it off) if 18-200mm is better than 18-55mm in all or most aspects. also have sigma 10-20mm to cover wide angle and nikkor 50mm F1.8 to cover fast lowlight shots or narrow DOF shots.
    You have a good range covered there. One for the superwide and the other taking care of low-light photography.

    Generally, most would agree that the 18-200 VR is superior to the 18-55mm kit lens... but although the telephoto range is tempting and I acknowledge that the 18-200 mm is a good walkaround lens, with your current setup, I think the next buy should be a flash (sorry for being a little OT here). Unless, of course, part of the reason you got the 50mm lens was because of your dislike for flash photography.

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    Default Re: About lens....

    how many slr users dont hav an external flash? even with 50/1.8 its necessory to complement it with good lighting produced by gd external flash.

    and i doubt u'll be able to sell off ur kit lens.

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    Senior Member zoossh's Avatar
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    Default Re: About lens....

    Quote Originally Posted by yyD70S
    Unless, of course, part of the reason you got the 50mm lens was because of your dislike for flash photography.
    yup, i dislike flash photography and in fact always try to switch off the flash. if it bounce up, i would press it down, try another mode to off the auto flash or just give up on that shot.

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    Default All Things Being Equal...

    If you have a bigger aperture, chances are you have a larger lens. All things being equal, a bigger lens allow more light to go through which is better.

    Less elements means less distortions. if you design a lens with the same glass, having less glass between the image and the sensor will result in a better picture.

    The laws of physics must be obeyed.

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    Default Re: About lens....

    Quote Originally Posted by zoossh
    yup, i dislike flash photography and in fact always try to switch off the flash. if it bounce up, i would press it down, try another mode to off the auto flash or just give up on that shot.
    if using CANON, go to settle of PROGram or MANUAL. then can get rid of problem.
    i m not try to promote CANON~...i guess it can be done over NIKON too. it is always my favourite option

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    Senior Member zoossh's Avatar
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    Default Re: All Things Being Equal...

    Quote Originally Posted by Hacker
    If you have a bigger aperture, chances are you have a larger lens. All things being equal, a bigger lens allow more light to go through which is better.
    i suppose the front filter size doesn't mean larger lens (lens as is the glass inside and not the whole body of lens) right?

    i.e. a lens that fits a 77mm filter does not mean it is larger than a lens that fits 58mm filter. right?

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    Senior Member zoossh's Avatar
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    Default Re: About lens....

    Quote Originally Posted by GOMUS
    if using CANON, go to settle of PROGram or MANUAL. then can get rid of problem.
    i m not try to promote CANON~...i guess it can be done over NIKON too. it is always my favourite option
    i usually use AP or SP cos it gives me some control and make it faster than manual.

  19. #19

    Default Re: About lens....

    On AP and SP the flash will never pop up unless you force it too. Then it will act as a fill flash. (This is how it works on my 300v)
    Furry Photos - Photography for the Modern Pet

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    Smile Re: About lens....

    Quote Originally Posted by zoossh
    i usually use AP or SP cos it gives me some control and make it faster than manual.
    http://forum.pbase.com/viewtopic.php?t=17181

    READ THIS TREAD IT MAY HELP YOU. CHEER

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