Halaking
Mu-43 Top Veteran
I see all my pictures from 25mm 1.8 wide open are much sharper than the 45mm 1.8 wide open, do you feel the same way?
No, it won't. For a similar framed picture, DOF is a function of sensor size and aperture only.The 45mm wide open will create a more shallow depth of field than the 25mm wide open, so if you take similar framed pictures, more of the subject will be in focus with the 25mm.
My mistake. I was thinking along the lines of cropping the 25mm picture to get a similar frame as the 45mm.No, it won't. For a similar framed picture, DOF is a function of sensor size and aperture only.
what camera are you shooting on?.... a stabilsed Oly or a unstabilsed Pany?... might just be camera shake/too low shutter speedI see all my pictures from 25mm 1.8 wide open are much sharper than the 45mm 1.8 wide open, do you feel the same way?
Closing the aperture of a lens by 2 stops from f/1.8 gives f/3.5.B
This is brilliant and confirms something I've felt for a long time. I put in crop 2 25 1.8 and crop 1 50 1.8 and the FF (crop 1) blurs the background much more. No surprise. Then I upped the FF to f 2.8, which is even smaller than the 2 stops DOF difference often quoted for m4/3, and still more background blur for the FF setup. Blurring the background happens under fewer conditions with the crop camera for sure. This is a difference and not necessarily a disadvantage though. I'm considering a fast prime for my EM-10 and like that I could shoot it wide open and still have usable dof for family photos.
Maybe post a pair of photos?Be patient Kevin, are you expecting members login everyday and reply quotes on the same day? I'm just login and find out there is a quote.
I use OMD E-M5/OMD E-M10 and it's not about shutter speed. I did a little test on tripod, and my 45mm is not as sharp as 25mm at 1.8 wide open, I feel that 25mm is tack sharp at 1.8 in the center, corners almost as sharp as the center, the 45mm needs to step down to 2.8 to get similar result. I used to think my 45mm is sharp, but compare it with my 25mm, the 45mm looks like a bad copy, that's why I want to know anyone has feel the same!
If you guys have both lenses, try yours on tripod, share your result with us, thanks!!
The 25mm/1.8 is about 66lpmm in the center with 49lpmm in the edges from the MTF charts wide open at f/1.8. The 45mm/1.8 on the other hand is about 66lpmm in the center with 46lpmm in the edges from the MTF charts wide open at f/1.8. The results in terms of sharpness should be pretty even. Sample variance of the lenses however could tell a different story. Maybe one of your copies is better than the other. Depending on the distance you are photographing and the subjects that you are photographing, you'll also notice depth of field differences which may make part of your subject slightly blurry depending on the depth of your subject. Most times, a wider lens will also look sharper just because more stuff is in focus than out of focus. Both lenses render differently and I haven't really noticed a huge difference in sharpness but I do notice that the 25/1.8 tends to look more in focus just because of how wide it is when taking a portrait. With the 45mm/1.8, I usually stand further back and try to get the subject farther away from the background to get the look I want.I see all my pictures from 25mm 1.8 wide open are much sharper than the 45mm 1.8 wide open, do you feel the same way?
Hi,Be patient Kevin, are you expecting members login everyday and reply quotes on the same day? I'm just login and find out there is a quote.
I use OMD E-M5/OMD E-M10 and it's not about shutter speed. I did a little test on tripod, and my 45mm is not as sharp as 25mm at 1.8 wide open, I feel that 25mm is tack sharp at 1.8 in the center, corners almost as sharp as the center, the 45mm needs to step down to 2.8 to get similar result. I used to think my 45mm is sharp, but compare it with my 25mm, the 45mm looks like a bad copy, that's why I want to know anyone has feel the same!
If you guys have both lenses, try yours on tripod, share your result with us, thanks!!