Old Burris Scope Help needed

[1mil]

I now have 3 of the old Burris Signature Scopes with the Daylight/Twilight adjustment feature. I think Burris warranty and customer service is great but even the guy I spoke really did not know much about these scopes... any experts here answer of few?
1. Was the daylight/twilight feature designed to help maximize clarity in various light condition or what was the real idea?
2. The scope shade appears to be spring loaded...pull it back does what? Help to easily adjust the parallax? The Burris rep said he never heard of this...go figure.
Thanks for any help!

 

[SBS]

According to the late 1990's Burris catalogs, it was designed to reduce glare during bright light and give maximum light during low light conditions. In early 2000's catalogs, mention was made of the ability to vary the depth of field. I have found that increasing the depth of field during bright light reduces the need to refocus except for extreme changes in distance. On the scope shade question, I am puzzled. The sun shades for mine are a fixed length tube that simply screws into the front of the scope, same as sun shades I have for other brands. Perhaps you are referring to the large coil spring that can be seen when looking in the objective lens. I THINK it is there to keep pressure against the objective lens system so that it is always against the parallax focusing ring and therefore keeping the focus from moving until you adjust it again. The adjustable aperature system was patented as the "Light Collector" and was available on the 3-12 (short lived model), the 4-16, 6-24 and 8-32 and were offered in gloss black, matte black and matte silver. They are great scopes and carry Burris' lifetime warranty.

 

[Evan]

I have the gloss black 8-32. You turn it to daylight, and a mechanical aperture closes down in the objective. If you turn it to twilight, that aperture opens back up. I suppose you get more light collection ability it twilight setting, but the daylight setting just seems to work better. It's like the aperture rings you can buy for scopes to "increase the depth of field".

Here's some discussion from a ways ago: http://forum.accurateshooter.com/threads/mirage-reduction.3925228/

Vortex Golden Eagle ships with a reducer ring in the box that achieves the same thing.

 

[1mil]

Thanks folks...this info makes a lot of sense now.
I think these are fine scopes too.
I know prairie dogs don't like them.