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| Digital zooms v optical zooms - Page 2 | |
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| Posted: Tue Nov 27th, 2018 18:12 |
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11th Post |
jk
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From wikipedia.... https://en.m.wikipedia.org/wiki/Digital_zoom Digital zoom is a method of decreasing the apparent angle of view of a digital photographic or video image. Digital zoom is accomplished by cropping an image down to a centered area with the same aspect ratio as the original, and usually also interpolating the result back up to the pixel dimensions of the original. It is accomplished electronically, with no adjustment of the camera's optics, and no optical resolution is gained in the process.[1] When comparing the image quality achieved by digital zoom with image quality achieved by resizing the image in post-processing, there's a difference between cameras that perform potentially lossy image compression like JPEG and those that save images in an always lossless Raw image format. In the former case, digital zoom tends to be superior to enlargement in post-processing, because the camera may apply its interpolation before detail is lost to compression. In the latter case, resizing in post-production yields results equal or superior to digital zoom.
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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| Posted: Wed Nov 28th, 2018 03:37 |
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12th Post |
Robert
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jk wrote:From wikipedia.... https://en.m.wikipedia.org/wiki/Digital_zoom More or less what I said... Only they probably took longer to compose the text.  Is this being explored as a Yorkshire alternative to a Z7 and the 500PF? If so I think it will win the Yorkshiremans prize for thrift but fail big time on IQ. Two zooms, one of which digital, on a bridge camera will never approach the quality of the 500PF (+ X1.4?) and cropping the Z7 (or D850). Straight logic, why would anybody buy the expensive option if the cheap option would even, almost get the job done.
____________________ Robert. |
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| Posted: Wed Nov 28th, 2018 06:59 |
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13th Post |
jk
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Re: "If so I think it will win the Yorkshiremans prize for thrift but fail big time on IQ. Two zooms, one of which digital, on a bridge camera will never approach the quality of the 500PF (+ X1.4?) and cropping the Z7 (or D850)." Agree with Robert. Eric, you only live once, never compromise the quality for the sake of a few pence/pounds. You know you are worth it!  Enjoy the Z7/D850 and 500mm. I still think the 200-500mm f5.6 AFS VR rather than 500mm f4 PF AFS is a better purchase as it gives more flexibility.
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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| Posted: Wed Nov 28th, 2018 14:22 |
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14th Post |
Eric
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Who said anything about ME changing my intentions? I merely said that images presented to me from a bridge camera exhibited less visible noise when digitally zoomed than when cropped on a computer and this may have changed my opinion of digital zoom. The camera was the LUMIX FZ1000 shooting in raw, by the way. My wife already has the later FZ2000 (in many ways a superior camera) and when I have a moment I will do the same comparison with her camera that mike did on his camera. I STRESS, the image sharpness does suffer ( equally with digitally zooming or cropping afterwards) and for this reason I wouldn't countenance choosing it over a prime lens, larger sensor and more pixels. I just feel it's interesting that high ISO noise appears to be less intrusive on a digital zoom. As I haven't got Mikes images to post I will take some shots on the FZ2000.... while I wait for my Z body and 500mm to be delivered. ( on recent Nikon delivery performance I have many weeks to effect this comparison 😡)
____________________ Eric |
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| Posted: Wed Nov 28th, 2018 14:39 |
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15th Post |
Robert
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Eric wrote:I just feel it's interesting that high ISO noise appears to be less intrusive on a digital zoom. It may be that further noise reduction takes place after or even during, the interpolation process. From that point of view, I think 'in camera processing' can be superior to post processing, because it's very camera specific and also image specific.
____________________ Robert. |
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| Posted: Wed Nov 28th, 2018 14:39 |
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16th Post |
Robert
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Eric wrote:I just feel it's interesting that high ISO noise appears to be less intrusive on a digital zoom. It may be that further noise reduction takes place after or even during, the interpolation process. From that point of view, I think 'in camera processing' can be superior to post processing, because it's very camera specific and also image specific.
____________________ Robert. |
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| Posted: Wed Nov 28th, 2018 15:26 |
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17th Post |
Iain
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I was going to say it must have been one with a 1" sensor as my Panasonic fz330 digital zoom is useless mine I have to say I am disappointed with it full stop. I should have kept my Canon hs50 as the iq was much better.
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| Posted: Thu Nov 29th, 2018 04:51 |
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18th Post |
jk
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Which Z did you go for Eric? Z7 or Z6. The 500mm will be great as you know but I will be interested to hear how you like/dislike the Z.
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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| Posted: Thu Nov 29th, 2018 14:06 |
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19th Post |
Eric
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jk wrote:Which Z did you go for Eric? Z7. I've had a brief look at the digital zoom on the FZ2000. Need to talk to Mike about his results because on THIS model you cannot use digital zoom when shooting Raw, 
____________________ Eric |
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| Posted: Thu Nov 29th, 2018 15:32 |
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20th Post |
Iain
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That's the same as my fz330 Eric.
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| This is topic ID = 1610 Current time is 21:58 | Page: 1 2 3 | |
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