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Archive 2016Front-End Filter Improves Corner Smearing
p.48 #1Front-End Filter Improves Corner Smearing
I had to adjust Zeiss ZM 25/2.8 by removing 2 shims. Nothing for 35mm FLE, 35mm ZM Distagon, Zeiss zm 28/2.8, c/y 28mm 2.8. I used techart pro. Very convenience but I cannot mount the camera to a tripod with this adapter. The c/y requires 2 adapters: c/y to lm and TCP adapters. Not so sure about the 21mm SEM as it is very close to infinity and dof is so large.
Feb 16, 2017 at 08:40 AM
p.48 #2Front-End Filter Improves Corner Smearing
ZM 25 I removed 2 shims from the front and 1 on the rear. ZM 35 I took two out left 1 gold shim in. I'm using the Hawk adapter on the 35 and a Fotosy adapter on the 25 but both lenses will hit the infinity hard stop. ZM 85 can use both also.
As far as using the TAP and a L bracket. I used rubber pads between the bottom of L bracket to give enough space between camera bottom and lower plate so it worked on a tripod with no interference but I'm no longer using the TAP right now. Decided to wait for a upgraded version or another brand if either of them come out with something a little better concept. I also noticed why my Hoya was soft on one side when testing the spring that retain it was off. I redone this anyway with a new filter rig with a screw down retaining ring so I'll test again against the Proxar 1m. I knew something was off. I do think the Hoya is better but I want to be sure.
As far as using the TAP and a L bracket. I used rubber pads between the bottom of L bracket to give enough space between camera bottom and lower plate so it worked on a tripod with no interference but I'm no longer using the TAP right now. Decided to wait for a upgraded version or another brand if either of them come out with something a little better concept. I also noticed why my Hoya was soft on one side when testing the spring that retain it was off. I redone this anyway with a new filter rig with a screw down retaining ring so I'll test again against the Proxar 1m. I knew something was off. I do think the Hoya is better but I want to be sure.
Feb 16, 2017 at 09:08 AM
p.48 #3Front-End Filter Improves Corner Smearing
Thanks teeraash and Guy for the info.
On ZM 25, I removed 3 shims from the front so that it can reach infinitely on TAP and also a unknown brand adaptor. Good to know that, for TAP, nothing need to be remove for 35mm FLE and ZM 35 Distagon. Think I will order the 5m lens to try out.
@teeraash, do you mean you also use a front-end filter on c/y 28mm 2.8? What lens is that? I also have this c/y 28mm.
Thanks.
On ZM 25, I removed 3 shims from the front so that it can reach infinitely on TAP and also a unknown brand adaptor. Good to know that, for TAP, nothing need to be remove for 35mm FLE and ZM 35 Distagon. Think I will order the 5m lens to try out.
@teeraash, do you mean you also use a front-end filter on c/y 28mm 2.8? What lens is that? I also have this c/y 28mm.
Thanks.
Feb 16, 2017 at 09:41 AM
p.48 #4Front-End Filter Improves Corner Smearing
Just wondering about any info on installing the Leica ElPro 3 like getting the retaining ring out and proper procedure. I'm just waiting on Fed X to deliver mine
Feb 16, 2017 at 12:01 PM
p.48 #5Front-End Filter Improves Corner Smearing
@Fred Miranda@, @HaruhikoT@, @GMPhotography@, @teeraash@
As far as I know all of you have the ZM 35mm 1.4 + OptoSigma 5m PCX, as do I since last friday.
Did any of you check across the frame sharpness at closer distances?
I am thinking of 3 to 6 m.
I think across frame performance is much worse compared to infinity at these distances,
so would like to know if you experienced the same.
As far as I know all of you have the ZM 35mm 1.4 + OptoSigma 5m PCX, as do I since last friday.
Did any of you check across the frame sharpness at closer distances?
I am thinking of 3 to 6 m.
I think across frame performance is much worse compared to infinity at these distances,
so would like to know if you experienced the same.
Feb 16, 2017 at 03:02 PM
p.48 #6Front-End Filter Improves Corner Smearing
Well I shot my Big Bronco wall which is about 10 meters and it's really even across the frame. Let me load up the Raws
Feb 16, 2017 at 03:09 PM
p.48 #7Front-End Filter Improves Corner Smearing
Lets start with the infinity stuff first. This is with and without lens at 1.4 and F4 which gives us a great idea of the improvement. ZM 35mm with OptimaSigma .5 lens
1.4 without lens center
1.4 lens center
1.4 without lens center
1.4 lens center
Feb 16, 2017 at 03:37 PM
p.48 #8Front-End Filter Improves Corner Smearing
Lets see F4 left and center
Feb 16, 2017 at 03:42 PM
p.48 #9Front-End Filter Improves Corner Smearing
On the corners to me with lens at F1.4 equals F4 without the lens thats a 3 stop improvement. Thats a big jump.
Ill work on Big Bronco now. Ill just do 1.4 with and without than move on to just with it on left and center.
Oh this is full frame. Im focused squarely on that center building which is infinity
Edited on Feb 16, 2017 at 04:03 PM · View previous versions
Ill work on Big Bronco now. Ill just do 1.4 with and without than move on to just with it on left and center.
Oh this is full frame. Im focused squarely on that center building which is infinity
Edited on Feb 16, 2017 at 04:03 PM · View previous versions
Feb 16, 2017 at 03:46 PM
p.48 #10Front-End Filter Improves Corner Smearing
GMPhotography wrote:
Ill work on Big Bronco now. Ill just do 1.4 with and without than move on to just with it on left and center
Would really appreciate if you could include midframe.
Ill work on Big Bronco now. Ill just do 1.4 with and without than move on to just with it on left and center
Would really appreciate if you could include midframe.
Feb 16, 2017 at 03:54 PM
p.48 #11Front-End Filter Improves Corner Smearing
Ill Load up raws from 1.4 on with lens
Feb 16, 2017 at 03:56 PM
p.48 #12Front-End Filter Improves Corner Smearing
Big Bronco which is my guess 30 feet away
Feb 16, 2017 at 03:56 PM
p.48 #13Front-End Filter Improves Corner Smearing
Full Frame at 2.8 with lens
Feb 16, 2017 at 04:05 PM
p.48 #14Front-End Filter Improves Corner Smearing
Uploading Raws of both series with lens on. Each series is 1.4,2,2.8,4,5.6,8
You got 7 days to download. BTW Big Bronco is focused before the infinity hard stop, so more mid range view
https://www.hightail.com/e?phi_action=app/orchestrateDownload&sendId=3063681875&emailId=e9fff41c3608fc7f3c70a46a8095c400
or
https://www.hightail.com/download/dDZGckhXRSs0b0RyZHNUQw
Edited on Feb 16, 2017 at 04:30 PM · View previous versions
You got 7 days to download. BTW Big Bronco is focused before the infinity hard stop, so more mid range view
https://www.hightail.com/e?phi_action=app/orchestrateDownload&sendId=3063681875&emailId=e9fff41c3608fc7f3c70a46a8095c400
or
https://www.hightail.com/download/dDZGckhXRSs0b0RyZHNUQw
Edited on Feb 16, 2017 at 04:30 PM · View previous versions
Feb 16, 2017 at 04:11 PM
p.48 #15Front-End Filter Improves Corner Smearing
Again I say the range is 2 to 3 stop improvement. On more wide open shots it seems like 3 . This F4 with lens looks a lot like F6.7 without lens which both Fred and I agreed on when we tested this lens before this new revelation started. As far as I'm concerned it's not coming off the lens. I'll be in NY next week shooting the city with both the ZM 25 and ZM 35 not to mention my CV 12 and ZM 85. So hopefully I can get some nice shots to post as this testing is boring me to tears. 
Feb 16, 2017 at 04:28 PM
p.48 #16Front-End Filter Improves Corner Smearing
This pretty much confirms what I see with my tests.
IMO, the 35/1.4 ZM + PCX is now optimal at f/4 and there is also a big advantage: You no longer have to focus at mid-field are to account for the induced field curvature.
IMO, the 35/1.4 ZM + PCX is now optimal at f/4 and there is also a big advantage: You no longer have to focus at mid-field are to account for the induced field curvature.
Feb 16, 2017 at 04:45 PM
p.48 #17Front-End Filter Improves Corner Smearing
Thanks for having uploaded these.
With Big Bronco I can see the same thing I noticed in my close range shots:
Corners/borders are much better than midframe wide open.
The behaviour is also very symmetrical, so I don't think this is an alignment issue.
By f/4 everything is pretty perfect, no questions on that one.
Fred Miranda wrote:
This pretty much confirms what I see with my tests.
IMO, the 35/1.4 ZM + PCX is now optimal at f/4 and there is also a big advantage: You no longer have to focus at mid-field are to account for the induced field curvature.
Regarding infinity I tend to agree, but talking about other distances: I am not so sure yet.
With Big Bronco I can see the same thing I noticed in my close range shots:
Corners/borders are much better than midframe wide open.
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The behaviour is also very symmetrical, so I don't think this is an alignment issue.
By f/4 everything is pretty perfect, no questions on that one.
Fred Miranda wrote:
This pretty much confirms what I see with my tests.
IMO, the 35/1.4 ZM + PCX is now optimal at f/4 and there is also a big advantage: You no longer have to focus at mid-field are to account for the induced field curvature.
Regarding infinity I tend to agree, but talking about other distances: I am not so sure yet.
Feb 16, 2017 at 04:46 PM
p.48 #18Front-End Filter Improves Corner Smearing
Yea I agree at F4 it's just so dang good. So really in effect here is we went from F6.7 without lens to really F4. Let's call it 5.6 as perfect can't get any better than that. For a .5m adjustment that's pretty dang good. On the 25 it's a 1m adjustment
Feb 16, 2017 at 04:52 PM
p.48 #19Front-End Filter Improves Corner Smearing
I'm also not settled in on the lens mount. In these I have 49 thin ring than 49-55 than 55-52 step down with 52 retaining ring. I'm hoping the Leica ElPro 3 gets the lens closer to the front element and not known yet that could help or not. I can't imagine it getting worse.
Feb 16, 2017 at 04:55 PM
p.48 #20Front-End Filter Improves Corner Smearing
GMPhotography wrote:
I'm hoping the Leica ElPro 3 gets the lens closer to the front element and not known yet that could help or not. I can't imagine it getting worse.
I tried a few different setups with the filter closer and also farther away from the front lens and did not manage to see a difference in image quality between these.
I'm hoping the Leica ElPro 3 gets the lens closer to the front element and not known yet that could help or not. I can't imagine it getting worse.
I tried a few different setups with the filter closer and also farther away from the front lens and did not manage to see a difference in image quality between these.
Feb 16, 2017 at 04:59 PM