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DPChallenge Forums >> Hardware and Software >> Pentax, maybe somebody can explain
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07/27/2016 03:21:56 AM · #1
I was just looking at Leaf's (I think third place finish), photo in the challenge. She shot it using a Pentax, which reminded me of an age old question that still plagues my feeble mind.

I have always been a super big fan of Pentax, and this is just another shot that adds to the list of reasons. I don't know how this is possible, but I assure you it is. I had a 4 mega pixel pentax that I took a shot from, I blew it up into a 20x30, and never lost a sharpness, or detail in anyway.
I know that may sound absurd, but the photo is still framed and hanging on my wall. The Pentax Optio s40 took that shot, and I have blew up photos to half that size with twice the megapixels, and lost a significant amount of the crispness in the shot. I don't know the math, but it has lessened my opinion of these fancy cameras with a gazillion megapixels. How that 4 megapixels can be just as efficient still boggles my mind. Shutterfly printed that photo, and the photo also had a blue filter that came on board with the camera. I printed hundreds of shots with that little point and shoot, and over and over, the quality was far superior than cameras with twice the megapixels. I heard its because they used Leica for glass, but I don't know if thats true.
07/27/2016 06:50:00 AM · #2
I am confused to know who "Leaf" is and which photo you are refering too ?
07/27/2016 08:36:31 AM · #3
Originally posted by Tiny:

I am confused to know who "Leaf" is and which photo you are refering too ?


I think he's referring to this image:
' . substr('//images.dpchallenge.com/images_challenge/2000-2999/2318/120/Copyrighted_Image_Reuse_Prohibited_1184584.jpg', strrpos('//images.dpchallenge.com/images_challenge/2000-2999/2318/120/Copyrighted_Image_Reuse_Prohibited_1184584.jpg', '/') + 1) . '

With respect to the question, your 4Mpx Optio S40 had 2304px in the long direction. Assuming the image you printed was not cropped, then you had about 76dpi, which for normal viewing distances (for a print that large) is OK, especially given good practice for enlargement to ensure a smooth result. More pixels helps, but only if the lens is capable of out-resolving the sensor, which is more and more difficult with higher pixel counts. These days, though, really good lenses can out-resolve even the resolution of the latest generation of 50+ megapixel SLRs. And the detail obtainable from a well-made photo using one of these cameras is truly astonishing.
08/24/2016 11:57:40 AM · #4
OMG it was Neat, and I am so sorry I said Leaf, I am truly an idiot. Especially considering I favorite'd the photographer, and had been stalking their portfolio for hours. LOL. I guess the discussion is a little bit too much for me to understand still kirbic, I mean I just don't understand then why the standard is to keep raising the megapixels, when essentially your getting the same quality that is, the same useful quality. I mean if you can get it up to 20x30 print, and it looks great, then why slow down my computer for a bunch of useless data, you would never need resolution that high, or at the very least, very, very, infrequently. I mean most photography is used digitally anymore, and what is used for newspapers, magazines, etc...isn't really necessary that you have that kind of resolution, in most practical terms the way I'm understanding it, is that it is slowing down my PC, and my photoshop for not much reason.
08/24/2016 07:51:47 PM · #5
Originally posted by sacredspirit:

I mean I just don't understand then why the standard is to keep raising the megapixels, when essentially your getting the same quality that is, the same useful quality.


for a number of reason both practical and for just marketing. The hobbyist photographer really has no "need" for a high megapixel sensor (I personally would rather have larger pixels...) considering most of us show our images at the most 1920px.yeah 4k display are getting more common.

one practical reason is to allow for a lot of cropping, you can get additional reach from a lens with more pixels or maintain resolution is you really need to crop into an area.
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