not sharp

SEPkent

SEPkent

Suspended / Banned
Messages
1,167
Name
Jon
Edit My Images
Yes
I have a d7100 nikon and a tamron 28-75 f2.8.
Seems to be that its not sharp. Is there something i can do to test? Fix?
 
Without samples this isn't going to go anywhere constructive. And the samples need the exif intact.
 
You could post an image and see if other owners here think your images are not sharp, and who may be able to suggest why.
 
I presume you have eliminated potential issues like camera shake? If so, looking at a photo, are there parts of the image that are sharp in front or behind the point where you have focussed, or is everything soft? If you use a different lens, does that produce sharp images? How are you saving images from the camera (raw, jpg best quality/low quality)?
 
Start by posting an image, at least that way we can quickly see what flavour of "not sharp" you're experiencing..

Flickr is good for showing the exif alongside the image, providing it'snot being stripped out by your processing and you have your Flickr account to share exif data (on by default, I think).
 
Not sure about a lot of stuff. pretty basic user. here is an image i took today. I haven't amended it at all.
a>

Thanks for all and any help.
 
What Apeture are you using? Maybe if you have it wide open that's why its not fully sharp?
 
That shot looks plenty sharp to me. But your sensor needs a clean.

What are you seeing that makes you think it's soft?
 
Presuming the focus is on the tip of the pencil, or the edge of the glasses just behind it, it looks pretty damn sharp to me.. Why do you think it isn't? It's got a shallow DOF so the focus is pretty slim, but the bits that are in focus are very sharp.
 
ok. thanks. maybe it's my eyes - i'll have to go to specsavers myself. thanks again to all
 
Nothing wrong with that. The tip of the pencil is as sharp as can be expected from a DX sensor.
 
Is it a DoF issue?
F7.1 will give loads of DoF at 24mm on a typical landscape, but at close distance its not really a small aperture.
 
ISO1000 may also not help - noise can reduce apparent sharpness if you pixel-peep.
 
With Toni on the noise issue. How much sharpening have you set in the camera, and what processing software are you using?
 
>>> This <<< thread might be of interest, I bought a sigma 70-200 that was very soft but turns out that it was front focussing quite a bit, causing what i thought was lens softness. After micro adjusting the image its now mega sharp and solved all the problems. Might be worth having a look into that if it seems like its soft? Just to eliminate it.
 
nickjohnwatson said:
>>> This <<< thread might be of interest, I bought a sigma 70-200 that was very soft but turns out that it was front focussing quite a bit, causing what i thought was lens softness. After micro adjusting the image its now mega sharp and solved all the problems. Might be worth having a look into that if it seems like its soft? Just to eliminate it.
Click to expand...

There's nothing wrong with the OP's image though.
 
^ what he said.

the image isn't soft now, so trying to "fix" it can only make it soft.
 
Phil V said:
Is it a DoF issue?
F7.1 will give loads of DoF at 24mm on a typical landscape, but at close distance its not really a small aperture.
Click to expand...
That's my thinking...it's a lack of DOF/ DOF placement.

Make the image smaller and it will get better :).
Or stop down a lot to ~ f/16.

One thing about DOF is at short distances it's about 50% in front of the point of focus, and 50% behind... because the point of focus is the front edge/pencil tip you are wasting about half of what you have at f/7.1
 
Last edited:
SEPkent said:
I have a d7100 nikon and a tamron 28-75 f2.8.
Seems to be that its not sharp. Is there something i can do to test? Fix?
Click to expand...

Jon, it can be difficult if not impossible to evaluate what your problem, particularly when we have so little information about how you captured the image. There are many factors which can influence sharpness - if you've given consideration to the points on this list then there is no reason why your images shouldn't be tack sharp (notwithstanding a hardware fault, which you can test by being an absolute control of your focus point and selecting a relevant target): http://lindsaydobsonphotography.com/blog/get-sharp-photos/
 
I uselightroom to post process. But the imageiposted i have done nothing with. Maybe its just as you say.
Too high an iso. And too small an aperture. I'll. Try again and harder.
School report - could do better.
 
Image quality = fine
Image size = large
Image area = dx
Af fine tune = -7
Firmware version = C-1.01, L-1.009
White balance = auto
Picture control = standard
Colour space = sRGB
Active D lighting = normal
Hdr = off
High iso nr = norm
 
Jon, you still haven't described why you think the shot you posted isn't sharp - it may be that "sharp" isn't the right word, and to get the correct answer the problem as you see it needs to be more accurately identified.
 
Sorry. I am pretty sure i focused on the black clip. And i thought it would all be a bit clearer than it appears.
Looks like this has all been answered though with DOF and ISO being the points i need to address.
 
There is nothing fundamentally wrong with the sharpness. The tip of the pencil is as sharp as you'd ever want, the rest is down to shallow DoF. So there is nothing wrong with the lens, nor is there any suggestion of motion blur. But you say the focus is not where you'd placed it. That gives you two likely options: either the camera was moved backwards between autofocus and taking the shot, or you've made an error in placing the focus point. I suppose there could also be something wrong with the autofocus, but before considering that I'd try again being very careful about where you place the focus point.
 
There is surely a joke in here somewhere about soft images and the fact that the OPs glasses are on the table but I can't quite find the words... However, fortunately I can hear you all queuing up to create this comedy gem as I speak!...
 
The OP is sharp but worth noting.This lens is actually as sharp as my nikon 24-75,,i have both,maybe not built to last as long but surprisingly perhaps it is as sharp.The only thing is they are known to be hit or miss as to if you get a decent sharp one.I had another i quickly got rid of that was nowhere as sharp even after doing the in camera focus adjustments,and i know others who have experienced this,seems to be the way with this model.Some have the gold ring,some its black and gold,same lens but the gold ring version far better in my experience,perhaps made in another country
 
You must log in or register to reply here.
Back
Top