Does more megapixels necessarily mean bigger sensor when it comes to DSLRs?

Discussion in 'Photography Beginners' Forum' started by rasheemo, Jul 30, 2008.

  1. rasheemo

    rasheemo TPF Noob!

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    ?
     
  2. nynfortoo

    nynfortoo TPF Noob!

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    Nope, not even slightly.
     
  3. sburatorul

    sburatorul TPF Noob!

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    its still an aps-c sensor no matter if it is 6-10-12 mpx, dont quite remember the size right now. but the thing is that the more mpx a senzor has the more noise it produces at high iso since the pixels are smaller. take that into consideration (of course each camera has noise reduction software in it so it is relative)
     
  4. rasheemo

    rasheemo TPF Noob!

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    alright, which DSLRs have the smallest sensor and which bigger? or are they all the same really? does it break down by prosumer/professional grade bodies?
     
  5. Steph

    Steph No longer a newbie, moving up!

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    There are roughly 4 sizes for sensors in dSLRs. From smaller to larger:

    - 4/3 system (as found in Olympus cameras E420, E520, E3...) : 17.3 x 13.0 mm
    - APS-c sized sensor (most dSLRs) : 22.2 x 14.8mm or 23.4x15.6mm depending on manufacturers
    - 28.1 x 18.7 mm (exclusively in the Canon EOS-1D).
    - Full frame (Canon 5D, 1Ds, Nikon D3, D700) : 24 x 36mm

    Off course if you want larger sensors, you could buy a medium format digital camera such as the Mamiya ZD (very expensive!).
     
  6. Village Idiot

    Village Idiot No longer a newbie, moving up!

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    I wouldn't say that. The APS-C format has nothing to do with it. If it's a FF sensor or an APS-H sensor, then it applies as well.

    The larger the sensor, the less the noise should be. Olympus is 2.0x. Canon is generally 1.6x except for the 5D and 1D MII+. I believe Sony and Pentax are 1.5x. Nikon is generally 1.5x with the d300 and d3 being the exception.

    When you jump from the crop sensor to the full frame it starts getting pricey. Canon has the cheapest FF bodies right now as you can find a used 5D for about $1600-$1700. These were nearly $3000 new. Other than that, you're looking at a starting price fo about $3000 for any other new FF camera.
     
  7. ksmattfish

    ksmattfish Now 100% DC - not as cool as I once was, but still

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    The larger the photo receptor sites (pixels on the sensor) are, the greater the signal to noise ratio is, which should translate into less noise, although there are about a dozen other variables that influence it too, so it's really hard to make these sort of generalizations. ;)

    If you take sensors with the same sort of technology, then the sensor with the larger photo receptors should have less noise. The problem with the generalization is that the technology is always changing. The EOS 20D and the EOS 40D have the same sized sensor, but the 40D has more photo receptors and they are smaller. While the 20D is renowned for low noise, general consensus seems to be that 40D images have even less noise (personally I find the difference pretty slight). The 40D benefits from improved technology both in the hardware and the software.

    Here's a good article discussing sensor and photoreceptor size.

    http://www.cambridgeincolour.com/tutorials/digital-camera-sensor-size.htm
     
  8. prodigy2k7

    prodigy2k7 No longer a newbie, moving up!

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    No, there are a few different sizes of sensors, but not as many as there are megapixels. Each pixel is bigger or smaller to fit inside of the certain space that a sensor is....

    Ex:
    Canon Rebel XT 8MP
    Canon Rebel XTi 10MP
    Canon Rebel XSi 12MP

    Each 3 cameras have different megapixels, but the same sensor size...
     
  9. sburatorul

    sburatorul TPF Noob!

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    if i remember right the biggest sensor is on hasselblands(hope i spelled it correctly) but than again those are 41 mpx sensors and need to be huge for iso performance
     
  10. Village Idiot

    Village Idiot No longer a newbie, moving up!

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    50 now.
     
  11. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    I thought it was up to 60... ;)
     
  12. Alex_B

    Alex_B No longer a newbie, moving up!

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    those are the latest ... ever growing ;)
     

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