Hi folks
Following on from my EFS 24MM post that led to a brief discussion on the different hoods, I did a short experiment.
EOS90D on a tripod in my small front garden. Yorkshire UK. Midday, grey overcast. Camera set on Green A to let it do all the work.
Two shots of a tulip head and bushes behind.
1st with LH 25 hood fitted
2nd with K&F hood.
Taken 2 mins apart.
I think I can see a difference, but struggling to put it into serious photographic language.
What do you think?
I should add that the camera wouldn't let me fine tune the focus in the A mode.
Both with same Ultra Low Reflection UV filter.
Ramsden
I hope some of this might be helpful.
For such a comparison, I suggest using manual mode, manual focus, and a remote trigger. For some cameras, the Canon Camera Connect app will work as a remote trigger without spending any money. If there are any clouds, or if there is too much time between shots outdoors, the scene lighting will have changed. If there is any wind, things will have moved between photos.
If the sun is just outside of the field of view is when one is most likely to see lens flare without a hood. It might be obvious enough to notice without close inspection.
https://en.wikipedia.org/wiki/Lens_hood#Cause_of_lens_flare
Also, it is possible to compare two images using free software.
Gimp: https://docs.gimp.org/2.6/nl/gimp-concepts-layer-modes.html subtract will show the difference.
Difference mode subtracts the pixel value of the upper layer from that of the lower layer and then takes the absolute value of the result. No matter what the original two layers look like, the result looks rather odd. You can use it to invert elements of an image.
GMIC, GraphicsMagick, and Imagemagick are 3 free software programs that can do it on a command line.
I gave an example of the difference between images at:
https://www.rsok.com/~jrm/2026Apr30_birds_and_cats/IMG_5771c_2026apr03_titmouse.html This case is slightly different processing differences and most of the difference is in the brighter areas.
