| Joined: | Fri Jul 25th, 2025 |
| Location: | Stroud Glos., United Kingdom |
| Posts: | 16 |
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Bob
A couple of things after our PM chat regarding the squirrel image.
It’s not as sharp as it could be. Was it taken through window glass and if so were you perpendicular to the glass ? Even a slight angle through window glass can lose a lot of definition.
I notice you had f16 on the lens. Whilst recognising close objects sometimes require smaller apertures to get everything in focus, I was not a fan of going beyond f11 with my Sigma lens. Even with recalibration it went soft after f11.
I would try some tests at f5.6/f8 of static subjects to see if sharpness improves.
I couldnt see what ISO you used. Keeping ISO as low as lighting and subject allow again helps with definition.
With regard to dust. I’ve never been troubled by a bit of dust in a lens. But dust on the sensor can show up as spots on an image at small apertures. The best way to check for sensor dust is to take a photo of a plain* white or light wall at f16 or f22. You will see dust bunnies when you review the image if the sensor needs cleaning.
* I once started to clean my sensor on seeing a couple of “dots” on my screen before realising the wife had previously stuck a poster on the wall with drawing pins.
I have developed a habit of trying to remove natural marks…just spent a day pressure washing the front of the house including a few wasted minutes trying to remove……….shadows of the telephone line
Click here to comment on this image.
Regarding the squirrel, not taken through glass - I'll run some test shots using each aperture. Regarding ISO numbers, as you know, with film the lowest number gives the finest grain and the sharpest image. How does grain size translate to digital photography?
Image reference Dust off - how does that work?
I see you have the curse of the photographer's eye - no minute speck is left unseen
Last edited on Fri Aug 1st, 2025 08:19 by