Leon Noel wrote:
@Cgiff: nice 3d-ness in your 1st flower shot, but there's imperfection spots in circular highlights in both shots, perhaps there's something in the elements themselves (air bubbles, coupling seperation) ?
Thanks, yeah I didn't notice that at first but now I'm a bit curious! I'm going to finish the conversion and shoot with it more (as much as I love it wide open, being able to stop down will be nice...). In many shots the circular highlights are completely blown out and those "bubbles" aren't visible, but it is funky.
Yakim Peled wrote:
Ellipsoid bokeh? Very unique. If I were in Nikon I'd make you an offer you would not refuse.
Happy shooting,
Yakim.
hah, thanks, I think I'm really going to like the lens. It's going to be a tough call picking between this and the Samyang 85/1.4 though, which is kind of hilarious considering the difference in price and prestige (Zuiko vs... Samyang??). Might just have to keep both.
cogitech wrote:
This phenomenon is a direct result of the mirror box entry size being smaller than the size of the rear element, so it happens much more on cameras with a smaller mirror box (crop cams).
It can also be due to a faster shutter than the shot should have. I've had a few shots where I was shooting with a faster shutter and large aperture, and i had weird clipping happening in the bokeh spots. (remember guys - i shoot a crop body)
A much more severe cropping effect happens when shooting at faster than 1/160th when using GI/Cactus V2S'.
Jos Tesseract wrote:
It can also be due to a faster shutter than the shot should have. I've had a few shots where I was shooting with a faster shutter and large aperture, and i had weird clipping happening in the bokeh spots. (remember guys - i shoot a crop body)
A much more severe cropping effect happens when shooting at faster than 1/160th when using GI/Cactus V2S'.
The phenomenon you are getting when shooting with flash is an entirely different thing.
It has to do with the duration of the flash pulse related to the travelling slit opening between shutter blades (which gets smaller as the shutter speed increases).
You will notice that only areas which are subject to light from the flash will be affected - the normal ambient exposure will remain even across the frame.
I could explain it better but im in the middle of replacing windows on my house
Empire wrote:
The phenomenon you are getting when shooting with flash is an entirely different thing.
It has to do with the duration of the flash pulse related to the travelling slit opening between shutter blades (which gets smaller as the shutter speed increases).
You will notice that only areas which are subject to light from the flash will be affected - the normal ambient exposure will remain even across the frame.
I could explain it better but im in the middle of replacing windows on my house
The flash blackout phenomenon has to do with the maximum speed the shutter curtains can travel. The X-sync speed is the fastest shutter speed where the entire frame is exposed at the same time. Anything faster than the X-sync will have one or both curtains in front of the frame.
Your 24-105/4L IS shot pretty much confirms my own observations with this lens. The bokeh is just very slightly ring-like. The edges are noticeably brighter than the center. It's actually visible in a lot of my blurred backgrounds with this lens, whereas when I shoot with my 100/2.8L macro IS, I never have this effect. In fact, I don't see it with any of my other lenses--just this one.
Not saying I dislike it--it's just a different look.
But your comments make me want to investigate this phenomenon more closely--I want to see whether the blur disks look different depending on whether the plane of focus is in front or behind the highlight.
