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Thread: Apature

  1. #131
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    Quote Originally Posted by Razr View Post
    In Av mode and full manal mode he can: In Av mode, the photographer selects f/2.8 and the camera body is forced to use the selected aperture.
    In full manual mode, the photographer selects f/2.8 as their shooting aperture, adjusting the shutter speed and ISO (if neccessary) to balance the exposure.
    ----
    You are WRONG. The photographer cannot force F/2.8 at full zoom on a Sigma 17-70 F/2.8-4.5. That's regardless of Av, M or whatever.
    Nikon D90, D80
    Nikkor 16-85mm AF-S DX F/3.5-5.6G ED VR, Tamron SP AF 28-75mm F/2.8 XR Di LD Aspherical (IF) macro, Nikkor 50mm F/1.4D, Nikkor 50mm F/1.8D, Nikkor AF-S VR 70-300mm F/4.5-5.6G IF-ED, Sigma 105mm F/2.8 EX DG Macro ||| 2x SB800 | SB600 ||| Manfrotto 190XB

  2. #132
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    Quote Originally Posted by tim11 View Post
    (SNIP)Are you saying that on a f2.8-4.5 that you can select f2.8 in AV or M mode and and F2.8 is available throughout the zoom range?
    Yes, in Av mode.

  3. #133
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    He has never used an SLR, or SLR lens. That's all there is to it. That or he's a troll. Let this discussion of 30 against 1 (very undereducated person) die. Razr is wrong, everyone else has more than chicken noodle soup for a brain. End of story.

  4. #134
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    Quote Originally Posted by D Thompson View Post
    OK, real easy, just a yes or no answer will do. On a f2.8-4.5 (using your example on this thread, page#1, post#8) I can use the aperture of f2.8 at any focal length the lens has? Mode is set to AV or M of course.

    You can.

    Quote Originally Posted by Razr View Post
    In Av mode and full manal mode he can: In Av mode, the photographer selects f/2.8 and the camera body is forced to use the selected aperture.
    In full manual mode, the photographer selects f/2.8 as their shooting aperture, adjusting the shutter speed and ISO (if neccessary) to balance the exposure.

    Finally, we get a straight answer - albeit the wrong one. RAZR... You may considered yourself a pro and google and wikepidia all you like the fact is you can't use F/2.8 at 70 mm (on a 17-70 F/2.8-4.5). Regardless of Av or M modes you try to use. It's the physical limitation of the lens. And at 70 mm, F4.5 becomes the optimum aperture. Accept it mate.
    Last edited by tim11; 10-25-2007 at 09:04 PM.
    Nikon D90, D80
    Nikkor 16-85mm AF-S DX F/3.5-5.6G ED VR, Tamron SP AF 28-75mm F/2.8 XR Di LD Aspherical (IF) macro, Nikkor 50mm F/1.4D, Nikkor 50mm F/1.8D, Nikkor AF-S VR 70-300mm F/4.5-5.6G IF-ED, Sigma 105mm F/2.8 EX DG Macro ||| 2x SB800 | SB600 ||| Manfrotto 190XB

  5. #135
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    Quote Originally Posted by Razr View Post
    I'll repeat here: only in "P" and "S" moded does the aperture setting change according to the focal setting.
    IN "M" and "Av" modes, the aperture does not change until/unless the photographer sets (selects) another aperture-got it?
    "Av" and "S" modes immobilze (lock-freeze) the aperture.

    This statement is just NOT true. I'm sorry, I've done it on my several cameras ... without firing a single shot ... and in the Av mode ... on a zoom lens:

    1) focal length to minimum ...
    2) set a variable aperture lens to MAXIMUM aperture
    3) telephoto to the other side of the focal range

    RESULT: the aperture will creep right up and close right down.

    EVERY SINGLE CAMERA BODY, my friend. They all do it ... and I've got proof!

    I'd make a movie of it ... but you can just get in your car, drive down to BEST BUY and do yourself ... live-action style. Living proof. There is no "locking" ... yes, if I return to the original focal length I started at, the aperture should and does return back to the original MAXIMUM. It does not stay at the higher aperture it got to.

    By the way: "OPTIMUM Aperture" does not mean "MAXIMUM Aperture", "Optimum" is the photgrapher's choice for a particular type of shot. Be it in need of bokeh or light deficiency ... the photographer chooses the aperture from the available settings at that focal length. He/She chooses the "optimum" aperture and then the camera chooses the shutter-speed to support it. That is it.

    My goodness ... this is a hard case.

    You simply cannot get f/4 pounds of crap into a f/2.8 bag.

    Look, I placed a chart at the very beginning of this thread to demonstrate EXACTLY what happens with two different lenses ... the 18-70mm and the 18-200mm. Please stop ignoring the rather simple and duplicatable facts and just accept this as common knowledge. Thank you ... and the horse you rode in on.
    Last edited by DonSchap; 10-25-2007 at 08:31 PM.
    Don Schap - BFA, Digital Photography
    A Photographer Is Forever
    Look, I did not create the optical laws of the Universe ... I simply learned to deal with them.
    Remember: It is usually the GLASS, not the camera (except for moving to Full Frame), that gives you the most improvement in your photography.

    flickr & Sdi

  6. #136
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    Troll - One who posts a deliberately provocative message to a newsgroup or message board with the intention of causing maximum disruption and argument.
    Lukas

    Camera: Anonymous
    I could tell you but I wouldn't want you to get all pissy if it's the wrong brand

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  7. #137
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    All this time, at the back of of my mind I'd like to believe he is in fact a troll for the reason I hate to believe anyone can be that stupid.
    Nikon D90, D80
    Nikkor 16-85mm AF-S DX F/3.5-5.6G ED VR, Tamron SP AF 28-75mm F/2.8 XR Di LD Aspherical (IF) macro, Nikkor 50mm F/1.4D, Nikkor 50mm F/1.8D, Nikkor AF-S VR 70-300mm F/4.5-5.6G IF-ED, Sigma 105mm F/2.8 EX DG Macro ||| 2x SB800 | SB600 ||| Manfrotto 190XB

  8. #138
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    For those of you wondering, Razr has NOT been an SLR owner, and is in line to order an Olympus E-3 that hasn't been released yet.

    http://www.dcresource.com/forums/showthread.php?t=34858

    After being an expert on the panasonic lens debate:http://www.dcresource.com/forums/sho...098#post258098

    I suggest everyone add him to your mute list, as he's a moron who is just looking for attention.

  9. #139
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    Quote Originally Posted by griptape View Post
    For those of you wondering, Razr has NOT been an SLR owner, and is in line to order an Olympus E-3 that hasn't been released yet.

    http://www.dcresource.com/forums/showthread.php?t=34858
    I understood the concept even before I got my D80. It's nothing to do with owning a DSLR.
    If I remember right RAZR also owns an FZ20 which has aperture of F2.8 throughout the range. I wonder if that him.
    Last edited by tim11; 10-25-2007 at 08:35 PM.
    Nikon D90, D80
    Nikkor 16-85mm AF-S DX F/3.5-5.6G ED VR, Tamron SP AF 28-75mm F/2.8 XR Di LD Aspherical (IF) macro, Nikkor 50mm F/1.4D, Nikkor 50mm F/1.8D, Nikkor AF-S VR 70-300mm F/4.5-5.6G IF-ED, Sigma 105mm F/2.8 EX DG Macro ||| 2x SB800 | SB600 ||| Manfrotto 190XB

  10. #140
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    Quote Originally Posted by Razr View Post
    Yes, in Av mode.
    Ok I though you were maybe being a clever troll and arguing opening(aperture), but that statement is simply, utterly WRONG. If the maximum aperture of a lens gives you f/4.5 at 70mm, the maximum f stop it can give you is f/4.5, it's physically impossible to get any more light to the sensor. The lens diameter is simply not big enough to allow an opening any larger.
    A good photograph is knowing where to stand.
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