Re: Panasonic G7 with 14-140mm lense still a good camera July 2022
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Michael Houston wrote:
JoviFan wrote:
Michael Houston wrote:
JoviFan wrote:
ok, whew - that's what I thought about the stabilization... and yea, I do like more 'zoom' for birding and I'm sure will take getting use to ... but wanted a higher quality photo.
I've never owned a G7, but several other Panasonics, and they all had a built-in teleconverter. I'll bet the G7 does too. It'll compromise your image quality a bit, but you might still might wind up with a superior image to a point and shoot.
oh right, by changing the MP setting you get 'more zoom'... I think that's what you mean!?
Kinda. On my cameras, at full resolution (16MP) the jpeg that is outputted (is that a word?) is around 7 or 8MP. (Jpegs are compressed by their very nature.) My cameras (and the G7 I'm sure) have a function called "Digital Zoom" that is either 2X or 4X. At 2X (the one I use the most) it takes your lens and effectively doubles the focal length. So in your case, instead of a 14-140, it'd be a 28-280 (and in full frame equivalent, 56-560). That will probably be enough for casual birding. If it's not enough, you can engage the 4X and double all of these numbers again.
What the digital zoom does, through some kind of digital trickery, is it uses only the center portion of the sensor, but enlarges it so that it appears to be full size. And through more digital trickery, I still get a 7 or 8MP jpeg. You don't have to change the MP setting, just engage the digital zoom through the menu. You can even assign it to a Function button if you want to use it often.
Although this approach can't help but compromise image quality as you're using less pixels for the image, frankly (as others have implied) unless you're a hard-core pixel peeper you won't be able to tell a whole heck of a lot of difference. I sure can't. And I think you'll still have a better image than you would with a point-and-shoot, and have a whole lot more versatility to boot. Although I think we all like adding lenses to our bag o' tricks, I think you have a pretty good starter rig there that'll hold you for quite some time.
Have fun!
I have the GX7 (as well as about 6 other Panasonic M43 cameras)
Panasonic offers two kinds of digital zoom on its cameras.
I don’t have much use for the “Extra Tele Conversion” feature-for 1.4x increase in zoom it requires you to set the JPEG quality to “M”
The “Digital Zoom” feature can be set to 2x or 4x. I find the 2x to be pretty good, the 4x not so good.
Converting from raw image information to JPG discards a lot of fine detail, this is why a strong crop of a JPG has poor results.
Digital Zoom crops before JPG conversion, adjusts the JPG conversion to keep more detail, and then makes a little white lie about the original number of pixels.
Roughly speaking, JPG conversion averages the detail from a block of 4 or more pixels to one set of values, smearing out detail and colour which is not visible when viewing the entire image.
By using ¼ of the total number of pixels (2X magnification) but not averaging pixels, the same amount, quality and kind of information is obtained as a normal JPG from the entire sensor.
There are fewer original pixels, but a lot less smearing.
A JPG doesn’t contain RGB information about each pixel, it contains the count of pixels, the size of the pixel groups, and cosine curves that represent average information of each group of pixels. The computer at the receiving end uses this information to determine the information for each pixel it displays.
Quite often the viewing computer can’t display as many pixels as the original image. The JPG information is convenient because the cosine curves permit the viewing computer to calculate the RGB values for the pixel positions it using instead of those in the original image.
Digital Zoom then lies about the number of original pixels, so where the cosine curve may have been determined by two pixels, the viewing computer uses that information to get RGB values for up to 4 pixels.
For 2x, the result is pretty good - a bit noisier perhaps.