Luminous Landscape Forum

Equipment & Techniques => Cameras, Lenses and Shooting gear => Topic started by: Guillermo Luijk on August 30, 2018, 12:01:21 pm

Title: Quick sharpness test Laowa 12mm f/2,8 ZERO-D + Magic converter
Post by: Guillermo Luijk on August 30, 2018, 12:01:21 pm

For anyone interested on how the Laowa 12mm f/2,8 ZERO-D performs + the Laowa Magic shift converter (1.4x converter + shift mechanism).
Sony A7 II, ISO100, 1/50, f/8 (I believe):

(http://www.guillermoluijk.com/misc/aspiration1.jpg)

100% crops:

Top left:
(http://www.guillermoluijk.com/misc/aspiration2.jpg)

Centre:
(http://www.guillermoluijk.com/misc/aspiration3.jpg)

Bottom right:
(http://www.guillermoluijk.com/misc/aspiration4.jpg)


No corrections applied (distortion or CA). Standard unsharp mask in ACR (40). For me the result is great, bearing in mind we are adding optics in front of a 12mm to make it a shiftable 17mm.

Regards

Title: Re: Quick sharpness test Laowa 12mm f/2,8 ZERO-D + Magic converter
Post by: mcbroomf on August 31, 2018, 07:48:42 am

Thanks for the test and crop Guillermo.
It's been a while since I looked at this lens combo, please remind me; it has 35mm FF coverage at 12mm right?  and converts to a 17mm with the converter with a wide enough image circle to allow shifts?

Was the image you show with no shift?
How much shift is possible before noticeable reduction in quality?
What does a 12mm look like (corners and center)

Regards

Title: Re: Quick sharpness test Laowa 12mm f/2,8 ZERO-D + Magic converter
Post by: Guillermo Luijk on September 01, 2018, 02:39:27 am

Quote from: mcbroomf on August 31, 2018, 07:48:42 am

Thanks for the test and crop Guillermo.
It's been a while since I looked at this lens combo, please remind me; it has 35mm FF coverage at 12mm right?  and converts to a 17mm with the converter with a wide enough image circle to allow shifts?

Was the image you show with no shift?
How much shift is possible before noticeable reduction in quality?
What does a 12mm look like (corners and center)

Regards

Hi Mc, yes it has 12mm coverage on FF. This is what it looks like (focus on the chimney top left):

(http://www.guillermoluijk.com/misc/laowaescena.jpg)


100% crops:

(http://www.guillermoluijk.com/misc/laowaf2.8.jpg)

(http://www.guillermoluijk.com/misc/laowaf5.6.jpg)

(http://www.guillermoluijk.com/misc/laowaf8.0.jpg)

Developed with DCRAW, this means absolutely no corrections nor unsharp mask.

The 12mm becomes a shiftable 17mm, didn't try maximum shift yet, the bridge picture was not shifted.

The lens seems to have a quite complicated field curvature, making it difficult to know what will be in focus at f/2.8.

RAW files for download:

http://www.guillermoluijk.com/laowa/


Regards

Title: Re: Quick sharpness test Laowa 12mm f/2,8 ZERO-D + Magic converter
Post by: mcbroomf on September 01, 2018, 04:12:07 am

Thanks again ...