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first trip to range: viper 6.5x20 44MM target dot

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/14/2010 at 18:08
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Optics GrassHopper
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so.... I had a Bushnell banner 6-18X 50m scope. and replaced it with the Vortex Viper. 

the good.
1. the build quality is fantastic. the checkering is deep and pointy. Excellent 
2. turret clicks feel great. the caps are heavy. very nice. 100% top notch. the adjusters work fine, but the pull up reset feels cheap compared to everything else on the scope. its not cheap, its just that everything else on the scope raised my level of expectation, so it stands out. I can see why PST vipers cost so much more money. 
3. target dot was fantastic at 100 yards. not good for anything under 25 yards.  
4. focused good at full power. much more clear then my banner was. I could read text.
5. when viewing Autumn leaves, the colors really pop, reds really jump. I'll be able to appreciate the beauty of what I'm about to shoot. Whacko

the one bad point.

there was a red/purple distortion visible on the left and upper edges of black objects at 100 yards on all magnification levels I tried, its a "purple edge". that was the only flaw and did not detract from all the other stuff that it did perfect. I was shooting with a guy that is a AA level Rifle Metallic Silhouette shooter, I'm completely unfamiliar with that sport. he shot it and thought it was as good as his $800 Leupold. he said there was nothing that distracted him. and the target dot was what he uses.  

The only thing I remember about the Leupold was that it was a 24X and was much more sensitive to eye position. but did not have a noticeable "purple edge".  

I'm very excited about the scope.... its kind odd that I look forward to looking thru the scope again. I wish I knew how to get rid of the purple edge, but I'm not a scope guy so I have no idea how normal that is. I seem to have seen that on photos I've taken before.


Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/14/2010 at 20:15
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i'll be getting mine some time this week and i'll look for a similar purple thingamajig and let you know what i find.  Might want to ask a Vortex rep their opinion on it, I know they certainly won't mind fixing it for ya either.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/14/2010 at 21:05
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Optics GrassHopper
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Originally posted by grimreaper21 grimreaper21 wrote:

i'll be getting mine some time this week and i'll look for a similar purple thingamajig and let you know what i find.  Might want to ask a Vortex rep their opinion on it, I know they certainly won't mind fixing it for ya either.

its the straight edges that did the purple edge. the target backdrop at my range is black tar paper. so its a big black square, I staple my target on to. the left and top edge had the neon purple distortion. there was no purple edge visible on the center of the target, but its round Clown.

maybe I need some sort of filter or need to adjust the speed of my eyeabllWhacko
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/14/2010 at 22:18
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yeah a strange light anomoly isn't out of the question either.  maybe a sunshade might help too.  maybe try to reproduce it somewhere other than at the range.  point it out in the backyard and see what happens
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/14/2010 at 22:53
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Optics GrassHopper
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I was under a shade. I was not in the sun.Bandito

I used Google... and its called purple fringing or Chromatic Aberration. I should have put the center reticle on the purple edge and seen if it was there in the center of the target. come to think about it, the banner did it too, but everything was so blurry that it didn't matter, pink blotchy stuff everywhere and to a higher degree. 

the Viper glass is crystal clear, its another situation where the viper does everything else so well that this effect has a chance to stick out. Howdy maybe this viper is like a gateway drug, now I need a $2000 scope. 

I found this:

that article says ED glass should fix it. my viper has "XD" glass. 

"In riflescopes, CA (Chromatic Aberration) is usually an artefact of objective lens system and can be largely corrected with sufficiently sophisticated design. It is also more prominent in higher magnification scopes where the tolerances are generally tighter and various aberrations are more visible. This is where Extra Low Dispersion (ED) glass comes in. When properly used, an addition of an ED glass element can help eliminate any noticeable CA from an optical system. The use of ED glass in riflescopes is not very prominent at the moment, but it is becoming more common. If you happen to need a riflescope with the highest possible magnification, it is worth your while to look at offerings with ED glass in the design."
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/14/2010 at 23:49
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My first thought on reading your post is CA. Doubt if it has anything to do with a straight edge casting colours off your target etc.
 
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/15/2010 at 21:37
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Optics GrassHopper
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any comments??

should I call Vortex and ask them? 


Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/15/2010 at 23:55
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might as well! I'd like to hear what they have to say.  Has anyone else noticed this problem? I never read anything about it in all the reviews I've seen about vipers thus far.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/16/2010 at 09:10
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I don't have that problem on my 6.5-20x. Call Vortex.

 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/16/2010 at 09:18
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I have the same scope and it does not have the issue you are talking about.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/16/2010 at 09:21
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maybe send scott or Sam a PM on here.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/16/2010 at 13:08
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ED glass does not necessarily fix it, but it helps if used properly.

Lateral chromatic aberration is typically symmetrical around the center, so it is unusual for you to see it on one side only.

There are a few potential reasons:

-the scope could be slightly faulty
-it is possible that your head is not perfectly centered with the eyepiece. Try to move your head slightly and see if CA fringes change.
-it is possible that you do not have the side-focus perfectly adjusted
-it is possible that if your mounts are slightly misaligned, so you had to compensate for that by significantly rotating the scope knobs for sight in.  How far away from optical center is your sight in?

ILya
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/16/2010 at 14:23
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What Ilya said.



On another note CA is just one of those things that will show up more with riflescopes than bino's or spotters and all optics will have CA,unless you can figure out how to only let one color into the optic, but then you would have no color. Obviously most optics companies do their best to minimize CA,but as with improving most things it affects cost. That being said the Vipers do very well job especially at their price point.

 With out personally looking at the scope I really cant tell you if there is a problem, but try Ilya's suggestion's and see how that goes.





Scott


Edited by Scott_at_Vortex - November/17/2010 at 07:58
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/16/2010 at 18:04
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Optics GrassHopper
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-it is possible that your head is not perfectly centered with the eyepiece.  

>> I’m a noobie.. I don’t have a constant position. So I’m always moving my head to get a clear sight picture.

 

-it is possible that you do not have the side-focus perfectly adjusted

>> Perfect :) no, but I swept thru the focus to see if it would go away at any point in the adjustment range. It didn’t. I did the same at Max, med and min zoom.

 

- How far away from optical center is your sight in?

>> I had to twist the elevation up a good bit. It’s on the “2” line. So I still have 24 clicks of upward adjustment. When I got it, it was on the 1 line, maybe the 1.5 line.. It goes from bellow zero to 4. The left-right had to be adjusted to the right and is almost to the 2 range. It came set at 1. All said and done, I still have a minimum for 24 MOA of adjustment available in all directions. Which I thought would be usable out to 300 yards.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/18/2010 at 18:46
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I have the same scope/reticle...I've not seen anything like you described.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/18/2010 at 20:12
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does yours say philipines or japan on the bottom?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/18/2010 at 21:04
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Optics GrassHopper
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at some point I heard some BS about being from japan. but yeah its philipines. 

assembly is cheaper there, the parts all look nice, they have to skimp somewhere, and if its not assembled correctly, then the warranty will take care of that.. 

I'm still fighting an urge to buy another one.

Originally posted by grimreaper21 grimreaper21 wrote:

does yours say philipines or japan on the bottom?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/18/2010 at 23:38
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Yeah i'm in love with mine too.. I'm thinking i might even go for a 2-7x to compliment the 6.5-20x, they can be best friends.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/20/2010 at 15:23
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Optics GrassHopper
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PM sent to scott.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/20/2010 at 16:47
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After purchasing the 2x7 VV last week I was so impressed that I called SWFA yesterday and bought the target 6.5x20 also. Should be here Monday so I'll watch out for the CA artifact and get back to you.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/20/2010 at 21:19
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didn't notice it on mine either, took it up to 20x clear as day. I did see what looked like a little purple starburst but it went away after I moved to a different taget. Not sure what caused it or if it was the same thing you are describing
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/04/2010 at 22:27
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Optics GrassHopper
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I've been a little disappointed by the performance of this scope. I'm a novice with optics. I don't own any optics that cost me more then $29. this scope should be the best optics I own. by a big margin, given the reviews of read about the vipers..

I dug out my Bushnell sentry spotting scope( it was a door prize) and this cheap spotting scope really has a lot more detail. 

for example there is a power pole that is visible from my backyard. about 150 yards away. there is a plate on it that says "high voltage" yellow background black letters about 5 inches tall.. day light is limited so, I think I've tried 9 or ten different times over the last week to get a good focus on that sign with the viper scope. just cant really read it clearly. 

today, I tried the cheap spotting scope set on 18X. its clear as day and is easy to read "high voltage"  and I have the revelation that the plate is raised like a car license plate.   the Bushnell is just that much better.Whacko

is this a fair comparison? I guess it's worth the $250, it is nicely constructed. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/05/2010 at 10:35
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I've not noticed it on mine.  Now I will have to take another look to see if it happens.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/07/2010 at 13:45
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Finally had a chance to check my Viper (6.5 X 20-44).  Conditions were bright sun (I'm using a 4 inch sun shade) and I tried a variety of magnification and ranges.  It was clear all the way to edges all the way to 20X.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/08/2010 at 15:13
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Optics GrassHopper
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thanks qball. but, I think this is all part of my learning curve.

I bought myself a UCC monarch, there was a $100 instant rebate last week. so it was $199. for a 3x9x40mm . FWIW, this is a "cheap" monarch, but the viper's mechanical details are superior. For example the turret cap threads are brass on the viper, the threads on the nikon are crumbly aluminum. taking the caps off the Nikon sounds like dragging fingernails down a chalkboard. the viper's caps are thick and screw on smoothly.

I took them to my favorite viewing area to eat lunch, some wetlands at the marina. it was overcast, gave the monarch a quick look and...

I get the same CA effect with both scopes. Whacko  My eyes must just be sensitive to it.


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