Some help with my new 10-18mm IS STM please?

jvceac wrote:

I said I didn't know if HTP would have any negative impact on sharpness but wondered if it could. ISO 200 in all of the OP's samples leads me to think he might be using HTP.

Wether he is or isn't using HTP it will have no effect on sharpness not sure  how you even think it would. Contrast or even the lack of it may affect ones perception of sharpness but that's not what the OP is seeing. He seems to have been unlucky enough to get poor copy,it happens.

trulandphoto wrote:

bent christian wrote:

trulandphoto wrote:

bent christian wrote:

Looking at the two full-resolution photos, I can't find anything in focus. Absolutely nothing. The issue appears to be something other than than diffraction at f/11. Diffraction would be minimal at this aperture in a crop sensor.

Like I said, diffraction starts on this sensor at f/5.9 at normal focal lengths. super wide like this would be even larger aperture.]

Diffraction does not present itself like this in crop sensors at f/11.

Some areas would still show focus.

"focus" and softness are different things but can be confused. Diffraction results in softness. At 10mm and f/11 on a crop sensor you could almost focus anywhere and the entire shot is "in focus."

Even if I defocus my lens?

The fact that you don't see anything "in focus" indicates it's not a focus issue.

Ummm....no. It does not indicate that definitively at all. If the lens isn't focusing correctly or the user is in error, it would be entirely possible to capture nothing in focus.

No it wouldn't be. The range of focus for a crop at 10mm and f/11 is like from 18 inches to infinity. If you can manage to get nothing in focus in that range you're special indeed.

G'night.

You are operating under the assumption that the this lens was focused properly.

dave_bass5 wrote:

Although this doesn't help much ive just taken a distance shot at f/11 with mine on my 80D. I know its not quite the same thing but 100% inLR shows very, very acceptable sharpness. This is what i would expect of this lens so i suggest you get yours replaced and try again.

Yes. F/11 can offer at least acceptable sharpness on a crop sensor if the lens is functioning properly. This issue does not appear to be diffraction.

trulandphoto wrote:

bent christian wrote:

trulandphoto wrote:

bent christian wrote:

Looking at the two full-resolution photos, I can't find anything in focus. Absolutely nothing. The issue appears to be something other than than diffraction at f/11. Diffraction would be minimal at this aperture in a crop sensor.

Like I said, diffraction starts on this sensor at f/5.9 at normal focal lengths. super wide like this would be even larger aperture.]

Diffraction does not present itself like this in crop sensors at f/11.

Some areas would still show focus.

"focus" and softness are different things but can be confused. Diffraction results in softness. At 10mm and f/11 on a crop sensor you could almost focus anywhere and the entire shot is "in focus."

Even if I defocus my lens?

The fact that you don't see anything "in focus" indicates it's not a focus issue.

Ummm....no. It does not indicate that definitively at all. If the lens isn't focusing correctly or the user is in error, it would be entirely possible to capture nothing in focus.

No it wouldn't be. The range of focus for a crop at 10mm and f/11 is like from 18 inches to infinity. If you can manage to get nothing in focus in that range you're special indeed.

G'night.

Like most modern lenses this lens can have focus set beyond infinite.  This is how you get nothing in focus.  Happens all the time due to either errant manual focus or AF issues with lens/camera combo.

ispyej wrote:

Hi guys,

I appreciate all your comments. I since took some photos with several different settings of the same landscape and ensured my focus was correct. I was experienced the same issue. Since more than one person has recommended to return the lens, it is what I have done.

Your welcome,hope you get it sorted out soon.If you go for an exchange could you report back with your findings.

Better to be sure than always wonder, I suppose.

Dareshooter, great to hear you live close to the Brecon Beacons. It's such a wonderful area. I'm studying at Cardiff University.

I live in the valleys and the Beacons are a ten minute drive away. My son did his degree in Cardiff too but that was a long time ago,he did applied biology,what are you studying ?

Have a good weekend everyone. Thank you all again!

You to and take care.

Best Regards,

Dareshooter

ispyej wrote:

... I used f/11 because I read that landscape photos will be at their best between f/11 and f/16, so that a lot of the photo can be in focus...

Yes for FF (full frame) sensors. With a APS-C 1.6X crop sensor f/11 has the equivalent DOF of f/17.6 with a FF sensor. Cans use sites like the one HERE to check equivalent DOF and diffraction aperture for different types of sensors.

I think its good idea that you returned the lens prior to the end of the return period.

However agree with others that the amount of haze could of affected AF accuracy. I downloaded your above image and viewed in DPP 4 and shows you were using multi-AF points.

For the bulk of my shooting with optical viewfinder I prefer single center AF point.

Also played around with your image in PSE 14 with its new Haze Removal tool and did some sharpening -- sill soft when 100% pixel peeping but a slight improvement viewing at smaller size.

Cheers,
Jon

ispyej wrote:

Hi guys,

I appreciate all your comments. I since took some photos with several different settings of the same landscape and ensured my focus was correct. I was experienced the same issue. Since more than one person has recommended to return the lens, it is what I have done.

Pity you've done that as there was almost certainly nothing wrong with the lens. I checked the two images you re-posted at a larger size, and in both cases they include the focusing distance in the maker Notes of the Exif data. The second one is focused at 5.53-6.56 m, and the first one is 1.19-1.4 m. It's not really possible to know how you did that, but maybe you half-pressed the shutter while still pointing at the ground in front of you? I've no particular reason for suggesting that other than it is one way to make that happen.

There is so much depth of field and so little background blur when shooting a wide angle lens at f/11 that the overall effect is an image which is very soft all over, rather than being obviously out of focus, and nothing is in sharp focus because the images have no foreground.

Where do I claim my prize?

trulandphoto wrote:

bent christian wrote:

Looking at the two full-resolution photos, I can't find anything in focus. Absolutely nothing. The issue appears to be something other than than diffraction at f/11. Diffraction would be minimal at this aperture in a crop sensor.

Like I said, diffraction starts on this sensor at f/5.9 at normal focal lengths. super wide like this would be even larger aperture.

Some areas would still show focus.

"focus" and softness are different things but can be confused. Diffraction results in softness. At 10mm and f/11 on a crop sensor you could almost focus anywhere and the entire shot is "in focus."

The fact that you don't see anything "in focus" indicates it's not a focus issue.

It is definitely a focus issue, see my other response.

BTW - diffraction softness is certainly visible at f/11 on a crop body, but it wouldn't make an image as soft as these. I use f/11 sparingly, but when I have to use it I get good enough results.

Steve Balcombe wrote:

ispyej wrote:

Hi guys,

I appreciate all your comments. I since took some photos with several different settings of the same landscape and ensured my focus was correct. I was experienced the same issue. Since more than one person has recommended to return the lens, it is what I have done.

Pity you've done that as there was almost certainly nothing wrong with the lens. I checked the two images you re-posted at a larger size, and in both cases they include the focusing distance in the maker Notes of the Exif data. The second one is focused at 5.53-6.56 m, and the first one is 1.19-1.4 m. It's not really possible to know how you did that, but maybe you half-pressed the shutter while still pointing at the ground in front of you? I've no particular reason for suggesting that other than it is one way to make that happen.

There is so much depth of field and so little background blur when shooting a wide angle lens at f/11 that the overall effect is an image which is very soft all over, rather than being obviously out of focus, and nothing is in sharp focus because the images have no foreground.

Where do I claim my prize?

Um. On APSC FL of 10mm at F11 aperture hyperfocal distance is 0.48m.  The near end of the depth of field at 1.2m would be about 0.32m and the far end would be infinity. In other words this exif data you found is useful but actually proves the opposite. Focus was correct and the lens must have an issue.