I am considering a Gen 4 IOR 3-18x42, and one of my concerns is the eye relief. I have read that some shooters require an extended base to get the scope far enough back, but I am not sure if this is a problem for everyone. For IOR users, how short is the eye relief? I plan on mounting it on an FN PBR XP, which has a Near 20 MOA base. Thanks!
Rifle Scopes IOR eye relief?
- Thread starter Jason280
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Re: IOR eye relief?
I had one on of these on an FNAR and because the space between the magnification dial and the turret housing is so short, and I like max spread on my rings, I had to push out my front ring farther on the base. This might be an issue because a bolt action would have a shorter base. You can always mount your front ring in closer to the turret housing. This is a great scope by the way-It is still sitting in the safe without a mate.
I had one on of these on an FNAR and because the space between the magnification dial and the turret housing is so short, and I like max spread on my rings, I had to push out my front ring farther on the base. This might be an issue because a bolt action would have a shorter base. You can always mount your front ring in closer to the turret housing. This is a great scope by the way-It is still sitting in the safe without a mate.
Re: IOR eye relief?
My 3.5-18x50 ffp has a generous eye relief, but from what I understand IOR addressed eye relief specifically for this scope, so YMMV.
My 3.5-18x50 ffp has a generous eye relief, but from what I understand IOR addressed eye relief specifically for this scope, so YMMV.
Re: IOR eye relief?
Thanks for the information. I've wanted one of the 3-18s for quite some time now, but the eye relief has always been a point of hesitation. The IOR site indicates 3.35", which sounds like enough. I guess I really won't know until I actually mount the scope!
Thanks for the information. I've wanted one of the 3-18s for quite some time now, but the eye relief has always been a point of hesitation. The IOR site indicates 3.35", which sounds like enough. I guess I really won't know until I actually mount the scope!
Re: IOR eye relief?
Eye relief isnt the real issue. Its where you will be able to mounr the scope. Due to the turret housing being so close to the ocular, you're limited as yo how far you can move the scope rearward.
The most aft rail slot on a bolt action is generally right before where the trigger is, because the bolt takes up space aft of that. That will be the furthest you can mount the aft ring, and with the turret/ocular spacing so close, its also the furthest aft the scope can be mounted.
So even though eye relief maybe 3.35" the scope may still be to far forward from the get-go, making it seem like eye relief is to short.
On a semi (like the FNAR above/AR) the last slot is further aft, so aft scope positioning has a lot more flexibilty.
The new IOR 3.5-18x50 has a longer much wider gap between the ocular and turret housing, combined with a longer ocular, there is much more flexibilty for moving the scope aft.
Eye relief isnt the real issue. Its where you will be able to mounr the scope. Due to the turret housing being so close to the ocular, you're limited as yo how far you can move the scope rearward.
The most aft rail slot on a bolt action is generally right before where the trigger is, because the bolt takes up space aft of that. That will be the furthest you can mount the aft ring, and with the turret/ocular spacing so close, its also the furthest aft the scope can be mounted.
So even though eye relief maybe 3.35" the scope may still be to far forward from the get-go, making it seem like eye relief is to short.
On a semi (like the FNAR above/AR) the last slot is further aft, so aft scope positioning has a lot more flexibilty.
The new IOR 3.5-18x50 has a longer much wider gap between the ocular and turret housing, combined with a longer ocular, there is much more flexibilty for moving the scope aft.
Re: IOR eye relief?
I have 3 of the 3-18 x 42s, good scopes now that the bugs are sorted out. The eye relief on them at higher powers tightens up a bit but isn't too bad, it's the short amount of tube between the power ring and the turret box that causes problems because it really limits you in terms of mounting options. On an AR or something like a DTA with a lot of rail on the topside getting the scope positioned properly usually isn't a problem but on a bolt gun with limited rail room for scope rings it can often be a problem-- especially if you have long arms or a longer LOP on your stock.
I have 1 of the 3-18 x 42s on my AR-10 and had 2 of them on Remington 700's using Badger/Seekins 20MOA bases & Seekins rings. With the R700's I could not get the scopes far enough back to prevent having to stretch my neck to "get in the scope." The only way to make getting in the scope comfortable was to shorten the LOP of the stock by 1.5" inches-- and that made for an uncomfortable rifle hold with my long arms. I ended up compromising with a somewhat shorter than ideal LOP to minimize the neck stretching but not totally eliminate it-- and as a result shooting the rifle was never 100% comfortable.
In the end I moved one of the 3-18x42s to my squirrel blaster 24" AR-15 and I tried putting the other on my LRB M25 but also couldn't get the scope back far enough to be comfortable. I sold that one to a friend for his AR-10. I regret having to sell it but it simply wouldn't work comfortably on any of my other rifles.
I upgraded the R700's to the new 3-18 x 50 IOR. Not only is there a little more eye relief at 18X with the 50mm version but the longer length of tube between the power ring and the turret box gives you much greater flexibility when installing the scope.
My recommendation would be to spend the few extra bucks for the new 3-18 x 50 illuminated for greater mounting options.
I have 3 of the 3-18 x 42s, good scopes now that the bugs are sorted out. The eye relief on them at higher powers tightens up a bit but isn't too bad, it's the short amount of tube between the power ring and the turret box that causes problems because it really limits you in terms of mounting options. On an AR or something like a DTA with a lot of rail on the topside getting the scope positioned properly usually isn't a problem but on a bolt gun with limited rail room for scope rings it can often be a problem-- especially if you have long arms or a longer LOP on your stock.
I have 1 of the 3-18 x 42s on my AR-10 and had 2 of them on Remington 700's using Badger/Seekins 20MOA bases & Seekins rings. With the R700's I could not get the scopes far enough back to prevent having to stretch my neck to "get in the scope." The only way to make getting in the scope comfortable was to shorten the LOP of the stock by 1.5" inches-- and that made for an uncomfortable rifle hold with my long arms. I ended up compromising with a somewhat shorter than ideal LOP to minimize the neck stretching but not totally eliminate it-- and as a result shooting the rifle was never 100% comfortable.
In the end I moved one of the 3-18x42s to my squirrel blaster 24" AR-15 and I tried putting the other on my LRB M25 but also couldn't get the scope back far enough to be comfortable. I sold that one to a friend for his AR-10. I regret having to sell it but it simply wouldn't work comfortably on any of my other rifles.
I upgraded the R700's to the new 3-18 x 50 IOR. Not only is there a little more eye relief at 18X with the 50mm version but the longer length of tube between the power ring and the turret box gives you much greater flexibility when installing the scope.
My recommendation would be to spend the few extra bucks for the new 3-18 x 50 illuminated for greater mounting options.
Re: IOR eye relief?
If you're going to get a 3-18 IOR get the 50MM model, it is better than the older 42mm version. I have the 42 and it works nicely on an AR but can't imagine it on a bolt gun, eye relief is too short.
If you're going to get a 3-18 IOR get the 50MM model, it is better than the older 42mm version. I have the 42 and it works nicely on an AR but can't imagine it on a bolt gun, eye relief is too short.
Re: IOR eye relief?
Jason,
Scroll down mid-way into following thread-dimensions look to be approx. 1.375"-1.5". If you want an exact measurement I can dig mine out of the safe for you.
[url=ttp://www.silencertalk.com/forum/viewtopic.php?f=22&t=13298][url=ttp://www.silencertalk.com/forum/viewtopic.php?f=22&t=13298]ttp://www.silencertalk.com/forum/viewtopic.php?f=22&t=13298[/url][/url]
John
Jason,
Scroll down mid-way into following thread-dimensions look to be approx. 1.375"-1.5". If you want an exact measurement I can dig mine out of the safe for you.
[url=ttp://www.silencertalk.com/forum/viewtopic.php?f=22&t=13298][url=ttp://www.silencertalk.com/forum/viewtopic.php?f=22&t=13298]ttp://www.silencertalk.com/forum/viewtopic.php?f=22&t=13298[/url][/url]
John
Re: IOR eye relief?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: tt350z</div><div class="ubbcode-body">Eye relief isnt the real issue. Its where you will be able to mounr the scope. Due to the turret housing being so close to the ocular, you're limited as yo how far you can move the scope rearward.</div></div>
Yup. I was unable to mount the scope far enough back to get proper eye relief due to the lack of roomb/t the oculat and the turret. I put both rings on the front housing. Lets see if it works...
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: tt350z</div><div class="ubbcode-body">Eye relief isnt the real issue. Its where you will be able to mounr the scope. Due to the turret housing being so close to the ocular, you're limited as yo how far you can move the scope rearward.</div></div>
Yup. I was unable to mount the scope far enough back to get proper eye relief due to the lack of roomb/t the oculat and the turret. I put both rings on the front housing. Lets see if it works...
Re: IOR eye relief?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SniperCJ</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: tt350z</div><div class="ubbcode-body">Eye relief isnt the real issue. Its where you will be able to mounr the scope. Due to the turret housing being so close to the ocular, you're limited as yo how far you can move the scope rearward.</div></div>
Yup. I was unable to mount the scope far enough back to get proper eye relief due to the lack of roomb/t the oculat and the turret. I put both rings on the front housing. Lets see if it works... </div></div>
With the 3.5-18x50 these problems do not exist.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SniperCJ</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: tt350z</div><div class="ubbcode-body">Eye relief isnt the real issue. Its where you will be able to mounr the scope. Due to the turret housing being so close to the ocular, you're limited as yo how far you can move the scope rearward.</div></div>
Yup. I was unable to mount the scope far enough back to get proper eye relief due to the lack of roomb/t the oculat and the turret. I put both rings on the front housing. Lets see if it works... </div></div>
With the 3.5-18x50 these problems do not exist.
Re: IOR eye relief?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: eleaf</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SniperCJ</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: tt350z</div><div class="ubbcode-body">Eye relief isnt the real issue. Its where you will be able to mounr the scope. Due to the turret housing being so close to the ocular, you're limited as yo how far you can move the scope rearward.</div></div>
Yup. I was unable to mount the scope far enough back to get proper eye relief due to the lack of roomb/t the oculat and the turret. I put both rings on the front housing. Lets see if it works... </div></div>
With the 3.5-18x50 these problems do not exist. </div></div>
I know this is an old thread but I just picked this scope up yesterday and I find that mounting it all the way back on the rail with the rings all the way forward on the scope that I still have to really strain to get a proper eye relief, which really sucks. I like this scope but I am not sure I am willing or wanting to compromise confront or using and extend rail to make it work.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: eleaf</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SniperCJ</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: tt350z</div><div class="ubbcode-body">Eye relief isnt the real issue. Its where you will be able to mounr the scope. Due to the turret housing being so close to the ocular, you're limited as yo how far you can move the scope rearward.</div></div>
Yup. I was unable to mount the scope far enough back to get proper eye relief due to the lack of roomb/t the oculat and the turret. I put both rings on the front housing. Lets see if it works... </div></div>
With the 3.5-18x50 these problems do not exist. </div></div>
I know this is an old thread but I just picked this scope up yesterday and I find that mounting it all the way back on the rail with the rings all the way forward on the scope that I still have to really strain to get a proper eye relief, which really sucks. I like this scope but I am not sure I am willing or wanting to compromise confront or using and extend rail to make it work.
