Diana Which is a Better 10 Meter Air Rifle and Why do you think so Pls? Diana 75 or Walther LG55 Tyrolean stock

The LG55 Tyro is a beautiful rifle...IMO, one of the true classics. Here's my DST.

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I love my Diana 75. 44 years old and just got it back from David Slade. Seals and buffer replaced, cleaned up and relubed. Still has the factory springs in it. Single digit extreme spread and almost 6.7fpe. Trigger is a measured 1.8oz pull. Although my eyes really struggle to see clearly through the diopter sights, it is one tiny hole on target.

Awesome, well made rifles.

Steve
That's a great point! If you are older than 30...or shoot at places other than well-lit 10-meter ranges...IMHO an adjustable-opening iris is a must-have accessory for any target rifle. OEM diiopter-sight eyepieces typically have an opening around 1.0mm which can be tough for other environments.

Gehmann, Centra, and AHG make a vast range of irises, and they can be had with any combination of color filters, a polarizer, and a 1.5x magnifying lens. But the simple variable opening models are economical, smoothly dial in any opening from 0.8 to 3.0mm, and make a huge difference. All these old sights made since the 50's use the same eyepiece mounting thread, too, so a single iris fits them all.

Here's an older Gehmann iris, in an Anschutz sight, on a Weihrauch HW 55.
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That's a great point! If you are older than 30...or shoot at places other than well-lit 10-meter ranges...IMHO an adjustable-opening iris is a must-have accessory for any target rifle. OEM diiopter-sight eyepieces typically have an opening around 1.0mm which can be tough for other environments.

Gehmann, Centra, and AHG make a vast range of irises, and they can be had with any combination of color filters, a polarizer, and a 1.5x magnifying lens. But the simple variable opening models are economical, smoothly dial in any opening from 0.8 to 3.0mm, and make a huge difference. All these old sights made since the 50's use the same eyepiece mounting thread, too, so a single iris fits them all.

Here's an older Gehmann iris, in an Anschutz sight, on a Weihrauch HW 55.
View attachment 477776
I have an adjustable Gehmann on my 300s, but find it more difficult to see through. I’ve dialed it both ways and although I can see the target getting brighter, the clarity of the target is horrible. Maybe I’m overlooking something in the setup of this sight.

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D75 by a landslide !!!

It ( the 75 ) is a Full size rifle, Large target grip, unreal trigger, full length anchute rail, adjustable butt pad ... an Honest full feature match tool.

Rebuilt several W55's and while they shoot well enough, there by build structure / size no where close to the diana. Use a more typical stock profile, there a lot smaller being more 3/4 size to the 75's. Trigger is good, but no 75 trigger !!!
 
I have an adjustable Gehmann on my 300s, but find it more difficult to see through. I’ve dialed it both ways and although I can see the target getting brighter, the clarity of the target is horrible. Maybe I’m overlooking something in the setup of this sight.
As specie said, checking / cleaning the lens is always a good idea! I'd also note that newer units have a bigger lens with a better focus range than these older ones.

When I first got one of these magnifying irises, I found myself actually relying too much on the lens. The iris opening is the primary means of optimizing depth-of-field; then go back and forth with the lens to tweak that, and adjust things to your eye. If you use too big an iris opening, you won't be able to see the front sight and target both clearly.

Also, the lens cannot compensate for some eye problems such as cataracts or extreme astigmatism, though Gehmann makes some (spectacularly pricey!) units that will fix the latter. If you wear glasses but don't have extreme issues, you may actually be able see through the lens better without your glasses - that's what I'm doing these days.

The old sights came with the big rubber cup eyeshades - but most modern match shooters do not use those. The contrast between the tiny, super-bright sight picture and surrounding blackness is fatiguing to the eye.
 
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I have the Gehman on my 75, I had the same problem with older eyes and used the magnifier in the front sight and made the target clear.
That’s exactly what my problem was! After specie talked about possibly cleaning the lens, I started looking closer at the sight. I then discovered that the silver collar pictured below is actually a focus wheel….DOH!!!! Shows my limited experience with the diopter sights. After focusing, WOW!!! What a difference!!! Crystal clear. Amazing setup😎

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