MrChipShoulder,

The Gehmann Basic (Anschutz Basic 9775 is the same iris, made by Gehmann) gives range 0.5 --> 3 mm - I do not need an aperture to open so large.

The Centra Basic 1.8 gives range 0.5 --> 1.8 mm, which is the range I most need for target shooting.

I do have the Anschutz Basic 9775 on two (2) of my field rifles, as I sometimes need to use a very large aperture when conditions are gloomy - my field rifles are fitted with 3mm front posts.

Have fun

Best regards

Russ