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Sony FE 35mm 1.4 VS. Voigtlander 35mm 1.7 Big Bronco Test
  
 
Fred Miranda
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p.14 #1 · p.14 #1 · Sony FE 35mm 1.4 VS. Voigtlander 35mm 1.7 Big Bronco Test


GMPhotography wrote:
Fred and my copies of the Ultron matched the same focusing spots both with filter on and off so I ordered a TAP for myself after he told me if his settings and confirmed infinity. I should have a bunch of shots to post when I get back to Phoenix. Having a lot of fun with it


I hope it works for you Guy!

Something else I noticed is that with the PCX the lens focuses closer. (A good 2 inches closer)
If using a helicoid adapter (like TAP) and focusing very close (0.2m), I found that I need to stop the lens down to at least f/2.5 to maintain the same resolution level. (compared to the lens MFD)

Can't complain about this because the lens wasn't designed to focus closer than 0.5m...

Also, the mid-field is very strong.



Sep 29, 2017 at 02:59 AM
GMPhotography
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p.14 #2 · p.14 #2 · Sony FE 35mm 1.4 VS. Voigtlander 35mm 1.7 Big Bronco Test


One thing Fred mentioned above was focal length it was certainly longer than my FE . If I had to guess like 2mm longer so like a 37mm


Sep 29, 2017 at 03:02 AM
Fred Miranda
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p.14 #3 · p.14 #3 · Sony FE 35mm 1.4 VS. Voigtlander 35mm 1.7 Big Bronco Test


GMPhotography wrote:
One thing Fred mentioned above was focal length it was certainly longer than my FE . If I had to guess like 2mm longer so like a 37mm


The FE 35/1.4 is actually shorter than 35mm. (I'd say similar to RX1RII at 33mm)

The CV 35/1.7 + PCX is just a tad longer than my Loxia 35/2.



Sep 29, 2017 at 03:06 AM
artur5
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p.14 #4 · p.14 #4 · Sony FE 35mm 1.4 VS. Voigtlander 35mm 1.7 Big Bronco Test


Fred, if by longer you mean that the focal length increases then no, itís actually the opposite. When you add a positive diopter element to any lens, the focal of the combo becomes shorter. Itís a basic law of optics. The simplified formula is : F3 = F1*F2/(F1+F2). Where F3 is the final length, F1 is the focal of the original lens and F2 is the focal of the PCX filter.
In this case : F3 = 35*5000/(35+5000) = 34.76
Thatís why youíre able to focus nearer when you use this PCX on your CV 35/1.7. The focal goes from the original 35mm to 34.76mm. To practical effects, itís like adding a 0.24mm. tiny extension tube. Therefore you can focus nearer than with the Ďnakedí lens. Of course that means also that, in order to reach infinity, you need to shorten 0.24mm. the length of the adapter or remove internal shims from the lens.



Sep 29, 2017 at 07:42 AM
Fred Miranda
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p.14 #5 · p.14 #5 · Sony FE 35mm 1.4 VS. Voigtlander 35mm 1.7 Big Bronco Test


artur5 wrote:
Fred, if by longer you mean that the focal length increases then no, itís actually the opposite. When you add a positive diopter element to any lens, the focal of the combo becomes shorter. Itís a basic law of optics. The simplified formula is : F3 = F1*F2/(F1+F2). Where F3 is the final length, F1 is the focal of the original lens and F2 is the focal of the PCX filter.
In this case : F3 = 35*5000/(35+5000) = 34.76
Thatís why youíre able to focus nearer when you use this PCX on your CV 35/1.7. The focal goes from the original
...Show more

Math is math and we can't argue with it.

In practical terms though, I didn't see any different in FL at infinity (with and without the PCX). If there is a difference, it's minimal and definitely not wider.

The CV 35/1.7 Ultron is a bit longer than my Loxia 35 at infinity to begin with.

Here are two crops showing the extreme edges at infinity. The left image is without the PCX and the right with it. I don't see a noticeable change in FL at this distance.





Top-Left Corner: Normal (left), PCX (Right)






Bottom-Right Corner: Normal (left), PCX (Right)




Sep 29, 2017 at 03:06 PM
GMPhotography
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p.14 #6 · p.14 #6 · Sony FE 35mm 1.4 VS. Voigtlander 35mm 1.7 Big Bronco Test


Yea I just noticed it when testing the FE side by side that the CV is longer but Fred did mention the FE is really 33mm which I did not know . Well going to head out and shoot the heck out of it today. Look forward to the TAP and the A9 firmware update when I get home. Iím shooting with the KF adapter right now. Interesting my Llawo 15 and CV 35 both at infinity are right at the start of the infinity mark. Truth be told with this Llawo 15 Iím questioning my 12-24 now. I would not mind buying back the Firin 20mm and a cheap 24-70 for PR work. But Iím hard pressed to do it since I have a great 12-24 on hand. I love shooting this 15 by a truckload. Im just very tactical when it comes to lenses. I Ike the feel of MF lenses


Sep 29, 2017 at 03:19 PM
Fred Miranda
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p.14 #7 · p.14 #7 · Sony FE 35mm 1.4 VS. Voigtlander 35mm 1.7 Big Bronco Test


Here is a super high quality () iPhone shot showing the CV 35/1.7 Ultron + PCX on a TAP:

46-55mm ring (To avoid any vignetting when using additional filters), blank 55 (Tiffen brand, UV glass removed), 5m PCX and El-pro3 retaining ring. I used a rubber O-ring to keep the front-lens perfectly centered. It looks like a protection filter on the lens.







Sep 29, 2017 at 04:46 PM
GMPhotography
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p.14 #8 · p.14 #8 · Sony FE 35mm 1.4 VS. Voigtlander 35mm 1.7 Big Bronco Test


My setup very similar to Fredís except the ElPro ring I used a stop down 55 to 52 at the end. I have a bunch of the O rings if anyone needs them


Sep 29, 2017 at 05:01 PM
twomblywhite
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p.14 #9 · p.14 #9 · Sony FE 35mm 1.4 VS. Voigtlander 35mm 1.7 Big Bronco Test



Fred Miranda wrote:
Math is math and we can't argue with it.

In practical terms though, I didn't see any different in FL at infinity (with and without the PCX). If there is a difference, it's minimal and definitely not wider.

The CV 35/1.7 Ultron is a bit longer than my Loxia 35 at infinity to begin with.

Here are two crops showing the extreme edges at infinity. The left image is without the PCX and the right with it. I don't see a noticeable change in FL at this distance.


Really impressive results. Thank you guys again for all of this testing.



Sep 29, 2017 at 05:06 PM
GMPhotography
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p.14 #10 · p.14 #10 · Sony FE 35mm 1.4 VS. Voigtlander 35mm 1.7 Big Bronco Test



Hey we are Lens whores we love it. 😂
twomblywhite wrote:
Really impressive results. Thank you guys again for all of this testing.




Sep 29, 2017 at 05:13 PM
 

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Fred Miranda
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p.14 #11 · p.14 #11 · Sony FE 35mm 1.4 VS. Voigtlander 35mm 1.7 Big Bronco Test


We should thank @HaruhikoT for starting all of this.

Here is the MTF simulation for the CV 35/1.7 Ultron + 5m PCX:

http://www.fredmiranda.com/forum/topic/1453834/84#14191202



Sep 29, 2017 at 05:19 PM
digital_AM
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p.14 #12 · p.14 #12 · Sony FE 35mm 1.4 VS. Voigtlander 35mm 1.7 Big Bronco Test


Fred, Guy, Bastian and many others who tested this, thank you! The results look great. Quick question. How did you remove the UV glass from the Tiffen ring? Just break it? Does the filter stay in place using the o ring or the retaining clip or both? Do I need any special tools to do this mod?

Fred Miranda wrote:
Here is a super high quality () iPhone shot showing the CV 35/1.7 Ultron + PCX on a TAP:

46-55mm ring (To avoid any vignetting when using additional filters), blank 55 (Tiffen brand, UV glass removed), 5m PCX and El-pro3 retaining ring. I used a rubber O-ring to keep the front-lens perfectly centered. It looks like a protection filter on the lens.




Sep 29, 2017 at 06:46 PM
GMPhotography
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p.14 #13 · p.14 #13 · Sony FE 35mm 1.4 VS. Voigtlander 35mm 1.7 Big Bronco Test


Iíll break it unless there is a retaining ring. Only tool you may need is a spanner wrench. 12 dollars on Amazon but only if your dealing with a retaining ring to hold filter down. My 55-52 step down holds it in place so no need


Sep 29, 2017 at 07:51 PM
brafman
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p.14 #14 · p.14 #14 · Sony FE 35mm 1.4 VS. Voigtlander 35mm 1.7 Big Bronco Test


I have a CV 35 1.7 and am interested in getting the PCX filter given Fred's pictures showing the clear improvement.

I'm a bit confused though about the other items -- step up ring, retaining ring, etc. I assume the step up is needed because the PCX doesn't come in the right size for the lens? Why are the other items needed?

If someone has figured out exactly what is needed to be ordered, I'd be grateful!

Thanks,
David



Sep 29, 2017 at 10:25 PM
GMPhotography
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p.14 #15 · p.14 #15 · Sony FE 35mm 1.4 VS. Voigtlander 35mm 1.7 Big Bronco Test


The PCX is 50mm. All this is explained in this thread. With links and descriptions. I posted it several times


Sep 29, 2017 at 10:39 PM
Fred Miranda
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p.14 #16 · p.14 #16 · Sony FE 35mm 1.4 VS. Voigtlander 35mm 1.7 Big Bronco Test


twomblywhite wrote:
Really impressive results. Thank you guys again for all of this testing.


The PCX helps the corners (reducing FC and astigmatism) but this also improves shooting wide open. Without the front-lens, the edges may look too sharp due to field curvature and the PCX fixes this.

See these crops showing without (LEFT) and with (RIGHT) the 5m PCX lens. The image was focused on the front pole.













Sep 30, 2017 at 12:29 AM
GMPhotography
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p.14 #17 · p.14 #17 · Sony FE 35mm 1.4 VS. Voigtlander 35mm 1.7 Big Bronco Test


Some shots with the CV 35 1.7 with the PCX in LA. This little lens has turned into gold for me. Couple shots




  ILCE-9    ---- lens    1/50s    100 ISO    +1.3 EV  






  ILCE-9    ---- lens    1/2500s    100 ISO    -0.7 EV  






  ILCE-9    ---- lens    1/1250s    100 ISO    -0.7 EV  






  ILCE-9    ---- lens    1/1250s    100 ISO    -0.7 EV  






  ILCE-9    ---- lens    1/400s    100 ISO    -0.7 EV  




Oct 01, 2017 at 02:03 PM
GMPhotography
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p.14 #18 · p.14 #18 · Sony FE 35mm 1.4 VS. Voigtlander 35mm 1.7 Big Bronco Test


It simply is sharp as heck as you can see I took a couple of some brick buildings to highlight the detail




  ILCE-9    ---- lens    1/500s    100 ISO    0.0 EV  




Oct 01, 2017 at 02:05 PM
GMPhotography
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p.14 #19 · p.14 #19 · Sony FE 35mm 1.4 VS. Voigtlander 35mm 1.7 Big Bronco Test


I have some more to post later but Im running out to run a test on another lens


Oct 01, 2017 at 02:06 PM
SoundHound
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p.14 #20 · p.14 #20 · Sony FE 35mm 1.4 VS. Voigtlander 35mm 1.7 Big Bronco Test


Fred, I read it all-every bit-my head hurts!

Seems there are these variables: field curvature, decentering, sensor curve, sample variation (lenses and filters). Seems like a mŲbius loop.

So for now I will use my 24-70 F2.8 GM, stop down as needed, and if there are any problems I, at least, can say 'it's just a zoom." However, I also get AF and a whole lot of focal lengths.



Oct 01, 2017 at 03:54 PM
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