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Canon G7X macro really bad

Started Mar 11, 2015 | Questions
rachi Regular Member • Posts: 235
Re: Canon G7X macro really bad

I confirm you (as mentioned in dpreview as I remember) that G7X has often some trouble in focusing with close subjets and low contrast object. Maybe it's better to focus manually.

(in contrast it rarely has problems in focusing on far objects, even moving objects).

Here a macro on a coccinelle, cropped. And camera can do little better I think if better focused

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Canon PowerShot G7 X
boogisha
boogisha Senior Member • Posts: 2,858
Re: Canon G7X macro really bad - I don`t think so...

Here are a few tries from my end, straight out of camera JPEGs, all shot hand-held.

1) Normal (auto) focus used, camera seems to be a bit too close in order to have the center of the scene in focus, where focus is clearly moved towards a bit further away points - letters "G" and "g".

#1, Normal focus, a bit too close

2) Macro focus used, camera moved away a bit in order to obtain correct focus at the center of the scene (two "o" letters). I also used "Av" mode here in order to set the aperture to f/2.8 you used in your test shots.

#2, Macro focus, moved a way a bit to obtain focus at the very center

3) Manual focus, a bit too close again (similar to #1), yet focus peaking here clearly showed that focus is moved outside the center of the scene (because being too close), indeed, and ending up on the outer edges of two "G" letters (left part of "G" to the left, right part of "g" to the right).

#3, Manual focus, a bit too close again, yet focus peaking clearly showed focus being on "G/g" letters

In the end, I don`t think there`s anything wrong with your camera, you just need to adapt and learn to use its strengths. Bigger sensor size comes with its pros and cons (depending on your needs), and pretty shallow depth of field can be tricky for auto-focus to handle correctly, as even the slightest mistake, while nothing uncommon, will be much more visible / apparent in comparison to smaller sensor cameras.

If absolute precision is a must, then I guess manual focusing (using focus peaking) is the best (if not the only) option. Only if you get out of focus areas where focus peaking shows your focus point you may think of possibly malfunctioning camera, otherwise auto-focus is not perfect, and perfection is not to be expected

And as already mentioned in previous posts, choosing a smaller aperture or/and moving away and zooming-in may provide interesting results as well (and much more possibilities than with smaller sensor cameras).

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Donthuis
Donthuis Regular Member • Posts: 139
Re: Canon G7X macro really bad - I don`t think so...

I still wonder about the G7X focussing performance on longer focal lengths. I.c. in  the range from 50-100 mm equivalent, where all macro lenses in analog & digital SLR's used to be produced in.

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Longterm photographer from way back in the 50's via analog SLR's, three generations of video equipment towards present 2 high end compacts both with (F)HD-video included.

boogisha
boogisha Senior Member • Posts: 2,858
Re: Canon G7X macro really bad - I don`t think so... Samples at 100mm (5)
1

Here are some sample shots, taken in manual mode using a tripod, manual focus (set on the car windshield / rear wheel), apertures vary from f/2.8 to f/11.

Note that the ruler shows units in centimeters, where the unit numbers don`t show anything particular, except that they may help in observing the depth of field. For those interested, the focus point was actually ~36.5 cm from the lens front element, as close as manual focus allowed at 100mm equivalent focal length.

p.s.I didn`t have anything more interesting at the moment, but I hope this will serve the purpose as well

p.p.s. I keep forgetting to switch image stabilization OFF when using a tripod, not sure if it had any influence on the image sharpness here... :/

First, (slightly) RAW processed JPEGs:

#1, RAW, 100mm (equiv.) @ f/2.8

#2, RAW, 100mm (equiv.) @ f/4

#3, RAW, 100mm (equiv.) @ f/5.6

#4, RAW, 100mm (equiv.) @ f/8

#5, RAW, 100mm (equiv.) @ f/11

And for those interested, here are the same pictures, but straight out of camera JPEGs.

#6, JPEG, 100mm (equiv.) @ f/2.8

#7, JPEG, 100mm (equiv.) @ f/4

#8, JPEG, 100mm (equiv.) @ f/5.6

#9, JPEG, 100mm (equiv.) @ f/8

#10, JPEG, 100mm (equiv.) @ f/11

In the end, here`s an example of what I would consider a "web edit"

#11, RAW, 100mm (equiv.) @ f/4, cropped and resized

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Donthuis
Donthuis Regular Member • Posts: 139
Re: Canon G7X macro really bad - I don`t think so... Samples at 100mm (5)

boogisha wrote:

Here are some sample shots, taken in manual mode using a tripod, manual focus (set on the car windshield / rear wheel), apertures vary from f/2.8 to f/11.

Note that the ruler shows units in centimeters, where the unit numbers don`t show anything particular, except that they may help in observing the depth of field. For those interested, the focus point was actually ~36.5 cm from the lens front element, as close as manual focus allowed at 100mm equivalent focal length.

p.s.I didn`t have anything more interesting at the moment, but I hope this will serve the purpose as well

p.p.s. I keep forgetting to switch image stabilization OFF when using a tripod, not sure if it had any influence on the image sharpness here... :/

First, (slightly) RAW processed JPEGs:

#1, RAW, 100mm (equiv.) @ f/2.8

#2, RAW, 100mm (equiv.) @ f/4

#3, RAW, 100mm (equiv.) @ f/5.6

#4, RAW, 100mm (equiv.) @ f/8

#5, RAW, 100mm (equiv.) @ f/11

And for those interested, here are the same pictures, but straight out of camera JPEGs.

#6, JPEG, 100mm (equiv.) @ f/2.8

#7, JPEG, 100mm (equiv.) @ f/4

#8, JPEG, 100mm (equiv.) @ f/5.6

#9, JPEG, 100mm (equiv.) @ f/8

#10, JPEG, 100mm (equiv.) @ f/11

In the end, here`s an example of what I would consider a "web edit"

#11, RAW, 100mm (equiv.) @ f/4, cropped and resized

Thanx, this is what I wanted to see. Seems quite a dependable performance. Canon manual advises not only to switch off the IS stabilisation, but also try the AUTO position! I feel for macro Av would be a more natural choice. Your pictures show on the 100mm equivalent focal length the G7X performs really well. We all know from tests that the 24 mm end leaves much to be desired with regard to softness and vignetting. My guess is the lens may also diverge from the flat surface of the sensor in the  corners. Making it less suited for photographing coins and documents lying flat by their nature.
I will use my G7X in the near future for copying diapositives by letting my projector shine on an expensive wax-based flat glasscreen I once bought for Super 8 copying. I will try focal lenghts from 35 mm equivalent and upwards (50-85mm?). Settings will include the ND filter and HDR (auitmatic or DR200 still under study). I have 5500 diapositives in metal cases of which +/- 5000 survived well. The only ones that lost most of their colors are the Kodak ones I once bought at several touristic sites.
PS Before throwing an old German Photomagazine of 2008 away yesterday I reread the article in it on the difference of macro photo's with small sized sensor cameras of that period as compared to the then modern digital SLR's with the usual focus range on macro shots. Small sized sensor cameras on wide angle position covered a wider background with deeper in focus effects than the SLR's did. Now that small sized cameras are moving to larger sensors the difference will become less.

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Longterm photographer from way back in the 50's via analog SLR's, three generations of video equipment towards present 2 high end compacts both with (F)HD-video included.

Rwolf01 New Member • Posts: 2
Re: Canon G7X macro really bad

As you can see the detail in the second image at the centre is much sharper.

Does this indicate there is something wrong with the autofocus on my camera? Or maybe with the G7X autofocus in general?

This probably isn't your problem, but it reminds me of a fun bit of trivia.  Canon calibrates each lens at the factory and then stores the values in FLASH memory on the image processing chip.  This includes an offset for the auto focus. 
I know this because I repaired an S100 with the 'lense error' problem by transplanting the whole lens & sensor assembly from a different S100 with a cracked screen.  That fixed the lens error and it appeared to work great from the small screen, but all the pictures were a bit soft at full resolution.  Going back and transplanting the main PC board fixed the AF problem.
If you bought your camera 2nd hand, someone might have done a similar repair without realizing the lens/sensor assembly and camera control chip are  matched set.

larry Contributing Member • Posts: 889
Re: Canon G7X macro really bad

There's nothing wrong with your camera. That's the lens fisheye corrections making a mess of things. Back up, and use zoom.

I just bought an HX80 to cover things the G7Xii does less well.  You can read my detailed review in the sony forum.

I love my G7Xii.  I'm amazed by the tech of the sony.

I don't love the sony.

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