The GetDPI Photography Forum
Great to see you here. Join our insightful photographic forum today and start tapping into a huge wealth of photographic knowledge. Completing our simple registration process will allow you to gain access to exclusive content, add your own topics and posts, share your work and connect with other members through your own private inbox! And don’t forget to say hi!
V
Vivek
Guest
None needed in my case. As I might have mentioned here earlier, I was shocked to find out that EOS lenses are much faster than any other. For example, the Canon EF 50/1.8 is faster than the Planar ZM 50/1.4 or the Olympus OM 50/1.2 (all "mint" samples- all with the speed booster).
Annna T
Active member
How do you measure "faster" ? By using fixed ISO, or fixed shutter speed and considering the variation of the other parameter at max aperture ?
In this case, depending on the metering mode the importance of vignetting could explain part of the variation ? For instance, center weighted or spot metering in the center of the frame could change the results of a strong vignetting lens..
Manufacturers could use spot metering in the center to measure the max aperture when they know that their lens exhibits strong vignetting (are there any guidelines the manufacturers have to apply when evaluating how fast one lens is ? )
V
Vivek
Guest
Fix everything and note the shutter speed in A mode.
Annna T
Active member
Which metering mode ?
Could vignetting play a role, supposing that you aren't using spot metering in the center ?
Is the Canon exhibiting a particularly low vignetting at max aperture ?
NB : it is not new that manufacturers are cheating somewhat when it comes to focal length or max aperture.
V
Vivek
Guest
In the lenses mentioned, the ZF 50/1.4 and the OM 50/1.2 have more fall off than the EF 50/1.8. I did not say that Zeiss or Oly cheated w.r.t the apertures. Rather, the Canon EF lenses have higher transmission- f/1.8 is even faster than the f/1.2 from another maker. May be they calibrate their meters differently.
No spot metering.
No spot metering.
Yes about 3/4 turn CCW was about what each of mine required. Took a good bit of trial and error testing to get each one exactly right.
I only had to fine tune the EF-Emount speedbooster for my Elmarit R 19mm. The rest of my Canon, Olympus OM, and nikkors all could focus to infinite without adjustment.
pegelli, the Metabones speedbooster works particularly well with Olympus OM lenses. Infact, I found the peformance of OM lenses better using speedbooster on my 5r than using them on an A7s!!
I too have the 24mm f2.8, and that lens is a very good performer wide open. Lately I acquired a OM 35mm f2.0. It is my current favorite lens
I too have the 24mm f2.8, and that lens is a very good performer wide open. Lately I acquired a OM 35mm f2.0. It is my current favorite lens
pegelli
Well-known member
Thanks Mazor, so far I've been very happy with my speedbooster for OM lenses.
Yesterday I did a little testing of my OM Zuiko 50/1.4 + SB vs. the Voigtlander Nokton 35/1.2 II. Exposure wise the difference between the (theoretical 35/1.0) of the boosted Olympus and the Nokton is negligible, for IQ aspects see below.
Here's the comparison (unedited in Lightroom, only WB set the same for all shots), both wide open at 50 cm distance (MFD for the Nokton, very close to MFD for the Olympus)
Olympus 50/1.4 + Speedbooster at f1.4 on the lens (so effective f1.0)
Nokton 35/1.2 II @ f1.2
Here the main flower looks a bit sharper, but that's mainly because the plane of focus is slightly deeper into the petals vs. the boosted Olympus version)
And a slightly different view
Olympus 50/1.4 + Speedbooster at f1.4 on the lens (so effective f1.0)
Nokton 35/1.2 II @ f1.2
Conclusion is that there is very little difference between the sharpness of the speedboosted Olympus and the Nokton, but that the bokeh of the Nokton is slightly smoother. Also the Nokton has slightly more contrast "out of the box", but nothing a little PP can't solve.
And just for fun, here's a shot with the 24/2.8 + SB wide open at MFD (25 cm). Amazing sharpness, contrast and bokeh not even too bad (considering the very busy buxus hedge background).
I've borrowed a Zuiko 35/2 once and liked it a lot, but since I already have 4 good 35's I didn't want to add a 5th to my collection. However if I ever run across one at a good price I'll probably cave in :facesmack:
Yesterday I did a little testing of my OM Zuiko 50/1.4 + SB vs. the Voigtlander Nokton 35/1.2 II. Exposure wise the difference between the (theoretical 35/1.0) of the boosted Olympus and the Nokton is negligible, for IQ aspects see below.
Here's the comparison (unedited in Lightroom, only WB set the same for all shots), both wide open at 50 cm distance (MFD for the Nokton, very close to MFD for the Olympus)
Olympus 50/1.4 + Speedbooster at f1.4 on the lens (so effective f1.0)
Nokton 35/1.2 II @ f1.2
Here the main flower looks a bit sharper, but that's mainly because the plane of focus is slightly deeper into the petals vs. the boosted Olympus version)
And a slightly different view
Olympus 50/1.4 + Speedbooster at f1.4 on the lens (so effective f1.0)
Nokton 35/1.2 II @ f1.2
Conclusion is that there is very little difference between the sharpness of the speedboosted Olympus and the Nokton, but that the bokeh of the Nokton is slightly smoother. Also the Nokton has slightly more contrast "out of the box", but nothing a little PP can't solve.
And just for fun, here's a shot with the 24/2.8 + SB wide open at MFD (25 cm). Amazing sharpness, contrast and bokeh not even too bad (considering the very busy buxus hedge background).
I've borrowed a Zuiko 35/2 once and liked it a lot, but since I already have 4 good 35's I didn't want to add a 5th to my collection. However if I ever run across one at a good price I'll probably cave in :facesmack:
V
Vivek
Guest
Your taste on boket is very special.
pegelli
Well-known member
Rejoice boket :angel:
Guy Mancuso
Administrator, Instructor
I was in Tempe Camera yesterday and theTamron rep was there and she let me play with the 15-30 on her Sony A7II with adapter. Looks pretty nice but if you want my opinion it's a 18 wheel truck. Not sure it's for me
it is available in EF mount though. and Olympus OM adapts very easily to EF.
For me I use my Olympus 24mm f2.8 via OM-EF dumb adapter on my Metabones EF to nex speedbooster
Oly OM 35mm f2.0 @ 2.0 on speedbooster
Canon 300mm f4L @ 4.0 on speedbooster
Canon 16-35 f4L IS @ 4.0 on speedbooster
Last edited:
pegelli
Well-known member
Thanks, I would be interested in that. Since I already have a Metabones SB for OM I was thinking getting the Mitakon for my Minolta MC/MD lenses. But if it's a lot lower quality vs. the Metabones I might as well get the higher quality straight away (since that will happen anyway in case the Mitakon disappoints)
I have Mitakon now in AI, PK and FD. All will disappoint due to sloppy construction. All of them rotate on NEX mount even after setting adapter to the locked position. The FD mount is particularly finicky when it comes to mounting. Optical quality seems to be pretty good but I can't live with the slop. I will likely return or sell and replace with Metabones.
@ pegelli
The Metabones SB in OM mount was back ordered by B&H
Recently I've been playing with Samyang 35mm 1.4 with Mitakon and A6000. Initial results look pretty good but it sure is one big chuck of glass on that tiny body. When I get some decent images I will post a few here.
The Metabones SB in OM mount was back ordered by B&H
Recently I've been playing with Samyang 35mm 1.4 with Mitakon and A6000. Initial results look pretty good but it sure is one big chuck of glass on that tiny body. When I get some decent images I will post a few here.