Is Rockwell right or am I mad?

PistnbrokePistnbroke Posts: 2,107Member
edited August 2015 in General Discussions
With a few minutes to waste I tested my Sigma 150-500 on my D7100 and D3200 to prove the loss of LPF made a difference. (allJPEG +9)
I photographed a house number at about 50 yards ..viewed in Microsoft office picture viewer....The image on the D3200 showed more detail.at 100% Crop .??? Then I noticed the D3200 was set for small only 6 MP as I had been using it for ebay photos....strange...6MP was sharper than 24 mp ...
so I tested the D800 D7100 and D3200 at large and small ...
Every time the small 6MP was sharper by looking at the grains of sand in the mortar ( this lens has fine tune zero so good for the D3200)
So come on whats the reason here..diffraction at F8 ?
Post edited by Pistnbroke on

Comments

  • donaldejosedonaldejose Posts: 3,351Member
    Could it be a function of the software in camera which takes the 24 mp raw data coming off the sensor and turns it into either large or small JPEG? In other words, the small JPEG generator is just adding more sharpening? Just an idea.
  • haroldpharoldp Posts: 984Member
    Don't mistake acutance for detail.

    ... H
    D810, D3x, 14-24/2.8, 50/1.4D, 24-70/2.8, 24-120/4 VR, 70-200/2.8 VR1, 80-400 G, 200-400/4 VR1, 400/2.8 ED VR G, 105/2 DC, 17-55/2.8.
    Nikon N90s, F100, F, lots of Leica M digital and film stuff.

  • paulrpaulr Posts: 1,176Member
    edited August 2015
    Wow Mr H had to look that word up "Acutance".
    Post edited by spraynpray on
    Camera, Lens and Tripod and a few other Bits
  • PistnbrokePistnbroke Posts: 2,107Member
    I tried this with the 14mm Samyang on the D800 and the Large was much better than the small so are we saying the Sigma 150-500 can only resolve 6MP so we dont need any more while the Samyang can do 20 MP so we do .........
  • PB_PMPB_PM Posts: 4,223Member
    Rockwell is nuts, you well that's something else. This all comes down to jpeg compression settings, in camera sharpening, picture controls (each gives a different perception of sharpness due to contrast settings), and other baked in factors. That is why I do not shoot jpegs unless requested to provide files right away at an event.
    If I take a good photo it's not my camera's fault.
  • donaldejosedonaldejose Posts: 3,351Member
    I disagree with always shooting RAW. Nikon's JPEGs are quite good and as long as you have accurate exposure and don't need to recover a significant amount of shadow detail you can let the camera create a JPEG for you as you shoot according to your preferences set in Picture Controls. JPEGs can be post processed a bit, just not as much as a RAW file. But most of the time you should not need the additional shadow recovery RAW gives you.
  • PB_PMPB_PM Posts: 4,223Member
    edited August 2015
    The reason I shoot RAW is because the picture controls do not do what i want, regardless of settings. My mindset is, the camera is dumb and does not know what I want.
    Post edited by PB_PM on
    If I take a good photo it's not my camera's fault.
  • WestEndFotoWestEndFoto Posts: 3,340Member
    Plus in post every image is adjusted differently. Shooting in JPEG applies the same setting everywhere.
  • haroldpharoldp Posts: 984Member
    Wow Mr H had to look that word up "Acutance".
    I looked under the 'A's and there it was. I recommend the procedure highly.

    Google also works.

    Regards ... H
    D810, D3x, 14-24/2.8, 50/1.4D, 24-70/2.8, 24-120/4 VR, 70-200/2.8 VR1, 80-400 G, 200-400/4 VR1, 400/2.8 ED VR G, 105/2 DC, 17-55/2.8.
    Nikon N90s, F100, F, lots of Leica M digital and film stuff.

  • heartyfisherheartyfisher Posts: 3,181Member
    ?? What you all talking about ??
    Show Samples please ..
    Moments of Light - D610 D7K S5pro 70-200f4 18-200 150f2.8 12-24 18-70 35-70f2.8 : C&C very welcome!
    Being a photographer is a lot like being a Christian: Some people look at you funny but do not see the amazing beauty all around them - heartyfisher.

  • spraynprayspraynpray Posts: 6,293Moderator
    I disagree with always shooting RAW. Nikon's JPEGs are quite good and as long as you have accurate exposure and don't need to recover a significant amount of shadow detail you can let the camera create a JPEG for you as you shoot according to your preferences set in Picture Controls. JPEGs can be post processed a bit, just not as much as a RAW file. But most of the time you should not need the additional shadow recovery RAW gives you.
    There is always ADL to recover shadow detail in camera. You can set it to high if you like.
    Always learning.
  • PistnbrokePistnbroke Posts: 2,107Member
    All this is fine but we dont seem to be getting to the answer to the original question ..why is 6MP giving me a sharper more pleasant picture than 24 MP on this 500mm lens ? Theres not a lot in it maybe 10%. If photographing birds clearly the feather detail will be better
  • heartyfisherheartyfisher Posts: 3,181Member
    All this is fine but we dont seem to be getting to the answer to the original question ..why is 6MP giving me a sharper more pleasant picture than 24 MP on this 500mm lens ? Theres not a lot in it maybe 10%. If photographing birds clearly the feather detail will be better
    To its like asking why I am floating when I should be sinking ... You have not provided enough information .. are you in a vat of oil are you in the dead sea are you wearing a rubberducky ..
    Please provide sample images .. and settings.

    Moments of Light - D610 D7K S5pro 70-200f4 18-200 150f2.8 12-24 18-70 35-70f2.8 : C&C very welcome!
    Being a photographer is a lot like being a Christian: Some people look at you funny but do not see the amazing beauty all around them - heartyfisher.

  • PistnbrokePistnbroke Posts: 2,107Member
    Will go find some ducks on the canal ....!!!
  • heartyfisherheartyfisher Posts: 3,181Member
    edited August 2015
    LOL thanks :-)

    ~:>
    Post edited by heartyfisher on
    Moments of Light - D610 D7K S5pro 70-200f4 18-200 150f2.8 12-24 18-70 35-70f2.8 : C&C very welcome!
    Being a photographer is a lot like being a Christian: Some people look at you funny but do not see the amazing beauty all around them - heartyfisher.

  • snakebunksnakebunk Posts: 922Member
    The Sigma 150-500 is not very sharp at 500mm. If it can only resolve 6 mp it makes sense that it looks sharper since each pixel is calculated out of the value of four pixels. It would be strange though if you can actually see details in the 6 mp image that is missing from the 24 mp image.

    In other words, I think four blury pixels can make one not so blury pixel. If you shoot at F8 and 400mm I think you will get sharper images at 24 mp.
  • donaldejosedonaldejose Posts: 3,351Member
    Something is happening which has not yet been explained.
  • heartyfisherheartyfisher Posts: 3,181Member
    edited August 2015
    Something is happening which has not yet been explained.
    Something may be happening but is at the moment undefined if it is or is not :-) or what it is in the first place ...
    Post edited by heartyfisher on
    Moments of Light - D610 D7K S5pro 70-200f4 18-200 150f2.8 12-24 18-70 35-70f2.8 : C&C very welcome!
    Being a photographer is a lot like being a Christian: Some people look at you funny but do not see the amazing beauty all around them - heartyfisher.

  • PistnbrokePistnbroke Posts: 2,107Member
    edited August 2015
    Well I found some ducks but being somewhat variable in there movement reverted to a fixed chart ...It transpires that the 6MB images feature much more ringing around black/white transitons than do the 24MP even though the settings have not changed ...so can anyone explain that??..So acutance it is then ...more pleasing to the eye.
    Here is a 100% crop from a 6MP at f 11 and sharp +9 ( comming when I work out how to do it ..no attachments it seems the instructions at the top of the forum are gibberish to me)
    sorry folks still cannot get an image to display
    Post edited by Pistnbroke on
Sign In or Register to comment.