RDS: Co-Witness or Lower 1/3 Co-Witness... your thoughts?

[Mysteryman]

I'm not referring to the listed field of view. Thanks though, I'm sure someone who's never looked through an RDS will find your comment helpful.

Neither was I. FOV is FOV. There is no obstruction with a reddot when used properly with both eyes open. The desire for a "greater FOV" with a reddot is a gimmick and a sure sign that the individual doesn't fully understand how a reddot is to be employed. The FSB or any other attachment is a non issue as it becomes a ghosted image. The Armson OEG is an excellent example(and the first reddot/rapid aiming point type sight) of how binocular/stereoscopic vision works. It has no lenses and absolutely zero FOV when viewed by the user. the FOV is generated by the non sighting eye which shares that image with the sighting eye. The OEG housing, or the reddot housing becomes ghosted and a non issue as far as FOV is concerned. The same effect occurs when you hold a paper towel tube to your eye then place your hand against it, it appears as though you have a hole in your hand thanks to stereoscopic vision and image sharing between both eyes.

MM

[Leuthas]

Neither was I. FOV is FOV. There is no obstruction with a reddot when used properly with both eyes open. The desire for a "greater FOV" with a reddot is a gimmick and a sure sign that the individual doesn't fully understand how a reddot is to be employed. The FSB or any other attachment is a non issue as it becomes a ghosted image. The Armson OEG is an excellent example(and the first reddot/rapid aiming point type sight) of how binocular/stereoscopic vision works. It has no lenses and absolutely zero FOV when viewed by the user. the FOV is generated by the non sighting eye which shares that image with the sighting eye. The OEG housing, or the reddot housing becomes ghosted and a non issue as far as FOV is concerned. The same effect occurs when you hold a paper towel tube to your eye then place your hand against it, it appears as though you have a hole in your hand thanks to stereoscopic vision and image sharing between both eyes.

MM

I was probably too vague in my first post.


Reel back a little bit with the regurgitation and find where I wrote about the irons obstructing the view. I didn't. This about cowitness and when it actually comes into play - when you're using the irons, and at that point your RDS becomes an artifact in your field of vision. Not much, but enough, and a 1/3 cowitness moves the hood of the RDS a little further away.

You affirm this yourself referring to ghosted images.

[henschman]

Definitely absolute co-witness and folding rear sights for me. I like cheek weld. Holding your head up off the stock with your neck muscles gets tiresome and negatively impacts accuracy, especially in prone and seated. Even if I had a rifle that was only ever used for close quarters, I'd like solid cheek weld. Having solid fundamentals with your main optic is more important to me than being able to transition to your backup irons 1 second faster in the long shot event that something happens to it. I agree with Mysteryman that a FSP is a complete non-issue. You don't even notice it when shooting fast at close quarters.

[Boba Fett v2]

I prefer lower 1/3 for all the reasons stated.

[4thPointOfContact]

Personal preference as everyone says but.....

Fixed sights? definitely lower 1/3rd
Folding sights? My pref is for absolute and keeping a consistent cheek weld regardless of which sights I'm using

[Renegade]

I go with no witness.

Do not want to see iron sight at all when using RDS. So I use flip up sights. When flipped up, the are co-witness so cheek weld is identical.

[Mysteryman]

I was probably too vague in my first post.


Reel back a little bit with the regurgitation and find where I wrote about the irons obstructing the view. I didn't. This about cowitness and when it actually comes into play - when you're using the irons, and at that point your RDS becomes an artifact in your field of vision. Not much, but enough, and a 1/3 cowitness moves the hood of the RDS a little further away.

You affirm this yourself referring to ghosted images.

Still not an issue. You don't need to look any further north than the top of the front sight post. With an absolute cowitness you still have half of the objective sense diameter to use. Ideally you should be shooting irons with both eyes open as well but that is a tall order for most of us. Identifying your target then bringing the sights into your line of sight completely negates the "cluttered" FOV through the reddot. Your focus is on the front sight anyway so the rest of the FOV is irrelevant.

MM

[Mysteryman]

I go with no witness.

Do not want to see iron sight at all when using RDS. So I use flip up sights. When flipped up, the are co-witness so cheek weld is identical.

That's still an absolute cowitness, whether you run with the irons up or down.

MM

[Renegade]

That's still an absolute cowitness, whether you run with the irons up or down.

MM

Not really as I never use the two together. Thus differentiating from an FSB/M4 vs folding.

[Mysteryman]

Not really as I never use the two together. Thus differentiating from an FSB/M4 vs folding.

You don't need to use them together to be a co witness. The sight height for both your optic and irons are on the same plain, they are co witnessed. You don't need to adjust your head or cheek weld to use either.

MM