Are these circular highlights ok?

This image was taken with the da*200 at f2.8, 2000th shutter speed. I thought that highlights were shaped by the aperture and therefore as the lens is wide open these highlights should be circular. Am I correct?

Other images taken on the same day have similar shaped highlights but only at high shutter speeds above 2000.

IMGP7853 by kiwao, on Flickr" class="comment_image" />



IMGP7853-2 by kiwao, on Flickr" class="comment_image" />

Having difficulty making the links!

click on the lower imgp in both cases and you will get to the link

I personally think that given you were shooting at 2000th that what you see is as good as it gets. It's a huge ask for a lens to stop down that quickly and settle into a perfect circle; just think of the inertia!

I'd try again at slower speeds and see what results you get then.

By the way, I really like your cherry blossom shots.

Looks ok to me. That must be the shape of the aperture when wide open

Thank you

Given the shutter doesn't operate until the lens has stopped down the shutter speed is ( or should be ) irrelevant. i.e the shutter speed is how long the shutter is open for NOT how long it takes to open after the button is pressed.

If the aperture is set at f2.8, wide open, and the camera focuses using that aperture then the blades would not operate and therefore should be wide open when the shutter operates. I am not sure at what aperture the camera focuses at but I think the aperture closes to f5.6 focuses then adjusts to the set aperture which in this case was f2.8 and if this is the case could it be that the shutter operating before the blades have finished?opening.

Thanks for your kind comment about the cherry blossom pics,

But shouldn't the shutter only open when the aperture has finished adjusting.?

No the camera focusses at the widest aperture of the lens ( except old non A-button lenses ) . When you press the shutter button the lens stops down and the mirror flips up. Only then the shutter opens to take the picture.


yes that's what happens

No the camera focusses at the widest aperture of the lens ( except old non A-button lenses ) . When you press the shutter button the lens stops down and the mirror flips up. Only then the shutter opens to take the picture.


The thing is am I expecting too much to see circular highlights considering the subject but if they should be circular in shape then what is causing this irregularity to happen?

I doubt if it is a problem with the lens or body. It is probably the way the light is being refracted by the subject, water droplets sand etc that is causing this effect.

TBH, I think your concerns are the result of pixel peeping. At normal viewing distances I cant see a problem

just to be clear I didn't write the following which is ascribed to me above

I dont think any of us would