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Forum: Pentax DSLR Discussion
06-03-2016, 09:26 AM
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Oh, I have a perfect understanding of reach. The REACH of a lens on ANY Aps-c camera or FF camera will only provide a difference in field of view when going from one sensor format to the other REGARDLESS of how old or how many MP those sensors have.... So are we to believe the image projected from a lens on a 25.5 x 15.6 Pentax ist D Aps-c sensor with 6.10 mp has much less reach than the image cast by the same lens on a 25.5 x 15.7 K3 24mp camera just because of the MP size? Anyone with an understanding of reach knows better than that. Now if you were talking about cropped image resolution loss when reducing the image size of a full frame image to that of an Aps-c image then that I would agree the more MPs provided is of great importance and your mathematics is spot on comparing the K3 24mp to the cropped 16mp K1 image.
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Forum: Pentax DSLR Discussion
06-03-2016, 04:50 AM
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Ok, lets say you take a picture of a bird. If the image fills the frame on a ist D with it's 23.5 x 15.7 sensor, then puts 6.10 MP on the bird. Using exactly the same lens from exactly the same spot at exactly the same time the bird will take up 2/3rd the width and 2/3rd the height of the sensor on the K1, so the K1 puts (2/3)*(2/3)*36= 16MP on the Bird, so now does this mean since the ist D has less MP then per your example a K3ll using approximately the same size sensor (.1mm less) capturing the image at the same dimension using the same lens, now one could say the K1 has more reach using the same lens since the MP is greater than that of the ist D? I think not.
---------- Post added 06-03-16 at 08:09 AM ----------
Bull, you don't lose any extra Magnification. The image captured by an APS-C camera vs a Full frame will be the same magnified dimension regardless of how many MP the sensor has, you'll only lose resolution.
This was exactly the selling point reasoning when trying to convince photographers buying Digital crop sensor cameras were a good thing. Less lens to carry around.
Again Bull, your not losing 33% magnification since both FF sensors are approximately the same size the magnification will be the same, what you lose is 33% resolution. You can't logically tell me because a camera has more MP then another camera with the same format size sensor it will have more magnification due to having more MP.
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Forum: Pentax DSLR Discussion
06-02-2016, 02:04 PM
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Huh, you don't lose any reach, if using a lens with a circle designed for full frame, such as the 300mm, you gain more image captured on the sensor at the same distance as an Aps-c camera due to the larger sensor.
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Forum: Pentax DSLR Discussion
05-26-2016, 05:42 AM
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Sorry but this is incorrect. A 300mm lens is a 300mm lens whether it is on a crop sensor camera or not. It does not become 450mm period. The only thing that would change is the imaging recorded by each sensor size. So no lengthening or shortening occurs in lens mm going from one body to the other.
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