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Archive 2016 · Front-End Filter Improves Corner Smearing

  
 
GMPhotography
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p.34 #1 · p.34 #1 · Front-End Filter Improves Corner Smearing


Damn its better than my GM 24-70 in the corners at 2.8


Jan 24, 2017 at 11:47 AM
GMPhotography
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p.34 #2 · p.34 #2 · Front-End Filter Improves Corner Smearing


Okay at 2.8 the ZM 25mm with proxar on and off and the GM 24-70 at 26mm






















Jan 24, 2017 at 12:01 PM
GMPhotography
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p.34 #3 · p.34 #3 · Front-End Filter Improves Corner Smearing


Its a keeper


Jan 24, 2017 at 12:03 PM
GMPhotography
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p.34 #4 · p.34 #4 · Front-End Filter Improves Corner Smearing


Here is the crazy part with Proxar on its better at 2.8 in the corners than with it off at F8. Its that much of a difference. Im floored

The ZM 25mm with Proxar on takes at 2.8 takes the GM to match it at F5.6



Jan 24, 2017 at 12:19 PM
Fred Miranda
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p.34 #5 · p.34 #5 · Front-End Filter Improves Corner Smearing


@GMPhotography

And we know how good the 24-70GM is at 25mm. (Although it needs at least f/4 for the corners)

This result is fantastic for the ZM 25/2.8!



Jan 24, 2017 at 12:28 PM
HaruhikoT
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p.34 #6 · p.34 #6 · Front-End Filter Improves Corner Smearing


GMPhotography wrote:
Here is the crazy part with Proxar on its better at 2.8 in the corners than with it off at F8. Its that much of a difference. Im floored

The ZM 25mm with Proxar on takes at 2.8 takes the GM to match it at F5.6


Wow, great results
There are some versions of Proxar 1m, having different diameter e.g. B57, B67, A42 and A28.5. Which one are you using?



Jan 24, 2017 at 12:29 PM
Fred Miranda
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p.34 #7 · p.34 #7 · Front-End Filter Improves Corner Smearing


HaruhikoT wrote:
Wow, great results
There are some versions of Proxar 1m, having different diameter e.g. B57, B67, A42 and A28.5. Which one are you using?


He is using the B50.
I know that because he got it from me.



Jan 24, 2017 at 12:31 PM
HaruhikoT
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p.34 #8 · p.34 #8 · Front-End Filter Improves Corner Smearing


Fred Miranda wrote:
He is using the B50.
I know that because he got it from me.


Thank you, Fred.



Jan 24, 2017 at 12:38 PM
Fred Miranda
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p.34 #9 · p.34 #9 · Front-End Filter Improves Corner Smearing


HaruhikoT wrote:
Thank you, Fred.


If I didn't already have the superb Loxia 21/2.8, I would be all over the ZM 25/2.8 + Proxar 1m.

I really want a great 28mm and hopefully the Contax 28/2.8 G will work well with the PCX 1.5m (reversed).



Jan 24, 2017 at 12:47 PM
BastianK
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p.34 #10 · p.34 #10 · Front-End Filter Improves Corner Smearing


Fred Miranda wrote:
He is using the B50.
I know that because he got it from me.

I couldn't find that one, may it be B57 50mm?



Jan 24, 2017 at 01:02 PM
Phillip Reeve
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p.34 #11 · p.34 #11 · Front-End Filter Improves Corner Smearing


Hmm, that ZM25 looks really interesting to me. I would like the focal length and it would be great to have a high contrast WA with nice sunstars and good flare resistance. Guy, if you could point it towards the sun and take some pictures that would be a great help.

I look forward for further results



Jan 24, 2017 at 01:03 PM
GMPhotography
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p.34 #12 · p.34 #12 · Front-End Filter Improves Corner Smearing


Loving it Fred

Fred Miranda wrote:
He is using the B50.
I know that because he got it from me.




Jan 24, 2017 at 01:06 PM
Fred Miranda
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p.34 #13 · p.34 #13 · Front-End Filter Improves Corner Smearing


BastianK wrote:
I couldn't find that one, may it be B57 50mm?


On the paperwork I have it says Hasselblad Proxar B50 but it could be wrong.

I just found one at Keh.com:
https://www.keh.com/shop/hasselblad-manual-focus-proxar-b50-1-0-50318-719369.html

It's confusing because their description shows "B50" but if you look at their picture, the lens is marked with "B57".



Jan 24, 2017 at 01:06 PM
GMPhotography
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p.34 #14 · p.34 #14 · Front-End Filter Improves Corner Smearing


Yea I have to do more testing for sure but so far very impressing. I'm just stuck on a house painting my exterior. So I'll get to it soon

Phillip Reeve wrote:
Hmm, that ZM25 looks really interesting to me. I would like the focal length and it would be great to have a high contrast WA with nice sunstars and good flare resistance. Guy, if you could point it towards the sun and take some pictures that would be a great help.

I look forward for further results




Jan 24, 2017 at 01:07 PM
GMPhotography
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p.34 #15 · p.34 #15 · Front-End Filter Improves Corner Smearing


It's working that's for sure

Fred Miranda wrote:
On the paperwork I have it says Hasselblad Proxar B50 but it could be wrong.




Jan 24, 2017 at 01:08 PM
BastianK
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p.34 #16 · p.34 #16 · Front-End Filter Improves Corner Smearing


Fred Miranda wrote:
On the paperwork I have it says Hasselblad Proxar B50 but it could be wrong.

Is the diameter of the lens 50mm?
As far as I understand there are 50mm = B57 (description bayonet for Hasselblad lenses) and 60mm = B60.
But maybe I got that wrong, so I would be interested in the diameter of the lens.



Jan 24, 2017 at 01:10 PM
BastianK
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p.34 #17 · p.34 #17 · Front-End Filter Improves Corner Smearing


Fred Miranda wrote:
On the paperwork I have it says Hasselblad Proxar B50 but it could be wrong.

I just found one at Keh.com:
https://www.keh.com/shop/hasselblad-manual-focus-proxar-b50-1-0-50318-719369.html

It's confusing because their description shows "B50" but if you look at their picture, the lens is marked with "B57".

As I expected, thank you very much!
These H'blad filter bayonets are quite confusing...



Jan 24, 2017 at 01:12 PM
HaruhikoT
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p.34 #18 · p.34 #18 · Front-End Filter Improves Corner Smearing


BastianK wrote:
As I expected, thank you very much!
These H'blad filter bayonets are quite confusing...


As far as I know B50 and B57 represent the same filter format. Also B67 = B60. Yes it's quite confusing...
I own B57 Proxar 2m. Its bare lens diameter is 50.8mm (2inch). I expect f=1m has the same diameter.



Jan 24, 2017 at 01:19 PM
Fred Miranda
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p.34 #19 · p.34 #19 · Front-End Filter Improves Corner Smearing


I was able to test the Contax 28mm f/2.8 G with the PCX 1.5m (in reversed orientation) front-lens today.

This is one of the first lenses tested by @HaruhikoT , and I see similar findings. There is little improvement in the center but there is big improvement towards the corners. See crops below at f/2.8, f/4, f/5.6 and f/8 (extreme corners)
Best of 3 for each aperture. Same sharpening settings for both.

I used the Kipon adapter and didn't have to adjust the lens in an way. I'm actually able to focus pass infinity with this adapter and the front-lens.




f/2.8 (Extreme corners)






f/4 (Extreme corners)






f/5.6 (Extreme corners)






f/8 (Extreme corners)




Jan 24, 2017 at 05:57 PM
ceder
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p.34 #20 · p.34 #20 · Front-End Filter Improves Corner Smearing


GMPhotography wrote:
Okay at 2.8 the ZM 25mm with proxar on and off and the GM 24-70 at 26mm


Wow!!

Thanks for posting



Jan 25, 2017 at 02:24 AM
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