Latest Lens Comments

Latest comments, thoughts and reaction to our recently reviewed Photography Lenses, including the Nikon Nikkor Z 24-70mm f/2.8 S Pro Review.

LenShepherd

Quote:

"Edge" is near the long edge and is consistent with all lenses.


Have you made a typo?
The long edge of the frame at its centre is 12 mm from the centre of the image with 24x36 format, whereas the short edge centre is 18mm. The corner is 22mm.
I presume you do not mean to imply you measure "lines" about 10mm from centre (on 24x36) as this can be largely irrelevant to the edge lines near the shorter edge at about 16mm out or lines in the corners at about 20 mm out.


Quote:With very long lenses there are many challenges and these are addressed appropriately depending on the lens.


I agree.
Printing out a "double normal size target" makes getting the camera exactly at 90 degrees to the target with 24x36 format easier with lenses around 14mm and wider.
Filling the camera frame with an Imatest target with a 400mm requires a focus distance much too long to be practicable indoors.

Made by LenShepherd on 28 Jul 2019 9:55AM, join in and reply to this comment!  Reply

altitude50
I have just returned from a photo trip taking landscapes in bright sunny weather (I know, not the golden hour(s)) Lots of trees and water. Most of the images were shot on my good Tamron 28-75. I put the Samyang on for about 10 minutes in one location, which I had almost forgotten about.
Now I have started editing, In my opinion the colour rendering of the Samyang images and detail are slightly better than the Tamron which cost almost 3x the Samyang.

Made by altitude50 on 27 Jul 2019 1:06PM, join in and reply to this comment!  Reply

johnriley1uk
The full answer to the question is actually far more complicated that we should get into, but Imatest assure us that figures such as delivered by the test procedure are absolutely possible.

The picture of the test target is of course merely for representation purposes and depth of field is limited so it will appear unsharp. It's just demonstrating the general idea.

"Edge" is near the long edge and is consistent with all lenses. With very long lenses there are many challenges and these are addressed appropriately depending on the lens.

Anybody interested in the theory of lens testing can look at the Imatest website, but it is a lot of technical information and much of it is beyond the relatively simple things we need to know for a review. Consistency is a major requirement and it enables us to realistically compare one lens results to another.

Made by johnriley1uk on 26 Jul 2019 6:29PM, join in and reply to this comment!  Reply

LenShepherd

Quote:Hi Evan,

How we test our lenses can be found here, and goes in to detail on the process:
https://www.ephotozine.com/article/lens-reviews---find-out-how-we-review-lenses-33167

Thanks
Josh


Could you kindly to update the link, please?

The image in the link shows a target separating from the "backing board" in 2 places, and of dubious contrast as the detail in the centre of each slanted Imatest panel is not defined.

There is no explanation as to whether by edge you mean the "top" edge where the most Imatest target detail is at about 10mm from the image centre on 24x36 format, or near "outer" edge at about 16 mm.

The tripod and head has relevance to an amateur on a limited budget but to me seems somewhat below a top quality set up, and especially so when testing longer focal length lens.

As I see it the link currently demonstrates a test procedure raising questions and not giving a fully credible explanation.

Made by LenShepherd on 26 Jul 2019 2:21PM, join in and reply to this comment!  Reply

joshwa
Hi Evan,

How we test our lenses can be found here, and goes in to detail on the process:
https://www.ephotozine.com/article/lens-reviews---find-out-how-we-review-lenses-33167

Thanks
Josh

Made by joshwa on 25 Jul 2019 11:44AM, join in and reply to this comment!  Reply

joshwa

Quote:Please add a full review of the Sony FE 24-105!


Here you go: Smile
https://www.ephotozine.com/article/sony-fe-24-105mm-f-4-g-oss-review-33431

Made by joshwa on 25 Jul 2019 9:18AM, join in and reply to this comment!  Reply

Evan_Ts
The MTF charts on this website are strange.
Z7 sensor has a resolution of 8256*5504. That is to say the maximum measurable value of sharpness is 8256/2 (=4128) LW/PH. How can you get the sharpness of 4750+ LW/PH, even higher than the theoretical value?

Made by Evan_Ts on 24 Jul 2019 2:39PM, join in and reply to this comment!  Reply

joshwa
Hi TheWoolf, when we have this lens in for a full review, we will be sure to add some, thanks Josh

Made by joshwa on 19 Jul 2019 5:12PM, join in and reply to this comment!  Reply

TheWoolf
It would be very helpful to see some landscape shots as I believe this is likely to be one of the primary uses of this lens (certainly it is the reason that I am interested in it).

Made by TheWoolf on 1 Jul 2019 10:46AM, join in and reply to this comment!  Reply

JonathanFV
Good to know! Enjoy the new camera and the snappier focus!

Made by JonathanFV on 24 Jun 2019 6:02PM, join in and reply to this comment!  Reply