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Swarovski NL 8x42 - First Impressions (1 Viewer)

henry link

Well-known member
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Thomas_M

Active member
The first sentence is not a description of pincushion distortion, but rather a description of angular magnification distortion, which as you say increases as pincushion distortion decreases. Mustache distortion employs enough pincushion in the inner 2/3 or so of the the field to correct AMD and then rapidly decreases the pincushion in the outer part of the field, causing AMD to rapidly increase near the field edge.

Below are some photographs of strong AMD distorting a circle at the field edge of a Swarovski 8x32 SV. I use circles for this purpose, but the distortion of a square follows the same pattern of radial compression near the field edge.

https://www.birdforum.net/showpost.php?p=3251084&postcount=1

I won't be completely certain about the NL's distortion until I or someone else examines and photographs a similar row of circles (or squares) through it and also examines and photographes a grid pattern placed behind the eyepiece and viewed through the objective end of the binocular to establish how straight lines change between the center and edge of the FOV.

Henry
Sorrry for coming back to an rather old question, after reading several different reviews and comments it is still not clear to me whether the 8x42 is suffering from a globe effect. If yes how does if compare to the Zeiss SF, either 8x42 or 8x32?

Thomas
 

Gijs van Ginkel

Well-known member
Thomas, post 842,
I investigated the NL 8X42 and did not observe a globe effect, see my report on the WEB-ste of House of Outdoor.
Gijs van Ginkel
 

pm42

Well-known member
Sorrry for coming back to an rather old question, after reading several different reviews and comments it is still not clear to me whether the 8x42 is suffering from a globe effect. If yes how does if compare to the Zeiss SF, either 8x42 or 8x32?
I see it when panning with the NL 8x42 but not with the SF 8x32. To be fair, I'm not very sensitive to it and I had to check after reading about it and I noticed it only when viewing straight lines such as buildings.
 

henry link

Well-known member
Hi Thomas,

It's easy enough to demonstrate that the 8x42NL has the type of distortion that causes the the globe effect, but whether it will be noticed by a particular person is much more difficult to predict as you can see from the last two posts.

To continue with my post that you quoted, I've now photographed the same series of circles through the 8x42 NL, which will be included in my review (if it ever gets done). I made a screen shot below that shows the shape distortion imposed by the NL (top) compared to the distortion of the 8x32 ELSV. Both have enough pincushion distortion at the midpoint between the center and edge (far left circle) to correct the angular magnification distortion that causes the globe effect, but as you near the field edge on the right both show the compression of shapes that cause the globe effect. The closest circle to the edge in both is similarly distorted, but because the NL has a wider AFOV that circle is farther from the center and so may cause less disturbance when panning. Subjective experiences are sure to differ between these two binoculars (as well as the Zeiss SFs, which I haven't photographed), so while the same angular magnification distortion is there in all of them it doesn't map quite the same way in different models, so I wouldn't try to predict anything.
 

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PeterPS

MEMBER
Hi Thomas,

It's easy enough to demonstrate that the 8x42NL has the type of distortion that causes the the globe effect, but whether it will be noticed by a particular person is much more difficult to predict as you can see from the last two posts.

To continue with my post that you quoted, I've now photographed the same series of circles through the 8x42 NL, which will be included in my review (if it ever gets done). I made a screen shot below that shows the shape distortion imposed by the NL (top) compared to the distortion of the 8x32 ELSV. Both have enough pincushion distortion at the midpoint between the center and edge (far left circle) to correct the angular magnification distortion that causes the globe effect, but as you near the field edge on the right both show the compression of shapes that cause the globe effect. The closest circle to the edge in both is similarly distorted, but because the NL has a wider AFOV that circle is farther from the center and so may cause less disturbance when panning. Subjective experiences are sure to differ between these two binoculars (as well as the Zeiss SFs, which I haven't photographed), so while the same angular magnification distortion is there in all of them it doesn't map quite the same way in different models, so I wouldn't try to predict anything.
Henry,
Your screenshots seem to suggest that the NLs have a lot of CA, whereas in my experience they correct CA as well as the SVs, or even better. Regarding RB I have also noticed it in the NLs, but it's rather mild.
Peter
 

henry link

Well-known member
Hi Peter,

These images shouldn't be used to evaluate CA. In order to photograph the field edge the camera must be pointed through the eyepiece from an off-axis angle.

I was quite impressed with the CA in my normal CA tests. Longitudinal was unusually well corrected for a binocular and lateral was probably the best I've seen in a modern binocular with a complex eyepiece and objective design.

Henry
 

Thomas_M

Active member
Gijs,
thank you for your comment, can you please give a link to the review, I couldn't find it on the house of outdoor webpage

Many thanks

Thomas
 

Thomas_M

Active member
Hi Thomas,

It's easy enough to demonstrate that the 8x42NL has the type of distortion that causes the the globe effect, but whether it will be noticed by a particular person is much more difficult to predict as you can see from the last two posts.

To continue with my post that you quoted, I've now photographed the same series of circles through the 8x42 NL, which will be included in my review (if it ever gets done). I made a screen shot below that shows the shape distortion imposed by the NL (top) compared to the distortion of the 8x32 ELSV. Both have enough pincushion distortion at the midpoint between the center and edge (far left circle) to correct the angular magnification distortion that causes the globe effect, but as you near the field edge on the right both show the compression of shapes that cause the globe effect. The closest circle to the edge in both is similarly distorted, but because the NL has a wider AFOV that circle is farther from the center and so may cause less disturbance when panning. Subjective experiences are sure to differ between these two binoculars (as well as the Zeiss SFs, which I haven't photographed), so while the same angular magnification distortion is there in all of them it doesn't map quite the same way in different models, so I wouldn't try to predict anything.
Hi Heny,

thanks a lot for the detailed reply and the photographs. I think I am not super sensitive to globe effect but judging from the images I fear that it could disturb me. A year ago I purchaised the little Kowa 6,5x 32 with 10 degreee field of view, nice binoculars but the globe effect is somewhat unpleasant. I am asking myself if it is intended to avoid strongly curved lines at the edges due to pincushing distorsion or just a design flaw. Almost all astronomical eyepieces, even the 100 degree Ethos are free from globe effect. Why are especially the low magnification binoculars suffering from it, NL 8x42, Zeiss SF 8x42 but not 10x or 12x.

Thomas
 
I got my pair of NL Pure 8x42 yesterday. I have had quite many Swarovski binos before during my 25 years of birding, SLC 7x42, SLC 10x42 (still have), EL SV 10x50 and now NL Pure 8x42. I have to say that these are so far the best binos I have ever watched through. I'm very happy about that. One minor drawback there is and that is the fact the lens cover is too tight. I solved this issue by sanding (using Dremel) two (2/6) of the inner knobs from lens covers. Now the lens covers are not too tight but just perfect.
 

Gijs van Ginkel

Well-known member
hyperboreus, post 850,
I had exactly the same problem with the eyepiece cover, so I decided to take a cover of another (historical) brand that fits very well, comes off quickly when necessary and protects perfectly against rain and dust. Eyepiece covers of many brands are in my experience often not very comfortable or easy to use, so I have made a collection of covers over the years and use the one that is suited for that particular job.
Gijs van Ginkel
 
That is what the seller also suggested to me, but it seemed kind of silly to have almost 3K€ binos and then some flimsy Opticron eyepiece cover on it. I would suggest the sanding method, works very well and you still have the original eyepiece cover on the binos...
 
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Gijs van Ginkel

Well-known member
hyperboreus, post 856,
I do not think that it is silly. The bag Zeiss supplies for the Victory SF 8x32 does not satisfy me at all, although it is well made etc. So I have other bags that fulfill my wishes much butter and the ZEiss bag is used for a smaller binocular and that works allright to.
Gijs van Ginkel
 
I felt like I was buying a Porsche 911 and the seller says to me that "no, the driving wheel is not good, lets change it to the one from Toyota Avensis with the Toyota logo on it". I think I got with a minor tweak still the Porsche driving wheel, if you know what I mean.
 
One minor thing I'm missing from the new NL Pure is related to the field bag: there is no easy handle as there was in the EL field bag I previously owned. This stitched handle can be seen here: https://www.bhphotovideo.com/c/product/712747-REG/Swarovski_60507_Field_Bag_for_EL_SLC.html. It was very easy to move the bag around, now you always have to get a grip from the strap to securely move the bag/binos around. I wonder why the did not include that feature to the NL Pure bag?
 

Gijs van Ginkel

Well-known member
The new Swarovski bag has in my view the advantage that it is easy to get the binocular in the bag and not with the lenses directed to the botom or the top cover of the bag. And I do not miss the handle in the previous bag at all. Swarovski has experimented quite a bit with different bag designs. The one that fitted like an envelope I liked very much, since it protects the binoculars very well and is very compact. But this rather expensive bag was not liked by customers, so Swarovski designed another one shown in post 856. I was not very fond of that bag, but tastes differ as is clear from the different posts. The new bag supplies the option of using a shoulder strap, but one can also insert a very short strap at the backside of the bag, so you can make a convenient handle. Everybody happy I assume since it combines the advantages that other bags did not have.
Gijs van Ginkel
 

[email protected]

Well-known member
Supporter
The new Swarovski bag has in my view the advantage that it is easy to get the binocular in the bag and not with the lenses directed to the botom or the top cover of the bag. And I do not miss the handle in the previous bag at all. Swarovski has experimented quite a bit with different bag designs. The one that fitted like an envelope I liked very much, since it protects the binoculars very well and is very compact. But this rather expensive bag was not liked by customers, so Swarovski designed another one shown in post 856. I was not very fond of that bag, but tastes differ as is clear from the different posts. The new bag supplies the option of using a shoulder strap, but one can also insert a very short strap at the backside of the bag, so you can make a convenient handle. Everybody happy I assume since it combines the advantages that other bags did not have.
Gijs van Ginkel
Once I got used to putting the NL's in sideways I like the new NL bag also. It is just something you have to get used to because you are accustomed to putting the binoculars in the case with the oculars up. The new NL bag is well-made and well padded and it has plenty of room for the strap. It works for me.
 
I like also that the binos are inserted sideways, they are easier to put and get from there. But still I’m missing the very convenient handle from the EL bag, it would have made the bag still a bit better.
 

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