Originally Posted by garyx
Is there a big difference at dark between the Z5 and the Z6.
I'm sure that the term "big" is going to be interpreted differently by everyone reading this.
First, the 3.5-18X44 Z5 has a smaller objective than the 3.0-18X50 Z6. So, right off the bat the Z6 lets in more light. Second, the Z6 has the HD glass in it.
So, to answer your question I went out in the dark and took out both scopes and looked at a neighbor's house about 100 yards away. They have a porch lamp and under that I can see equally well with both scopes. Down about 50 yards more, another neighbor still has their Christmas lights up but no porch light. The lights are hanging in a tree. I can see the lights with the Z5 but the tree is a blur. With the Z6 I can see both the lights and the branches and pine needles around the lights. I then swung back to the neighbor with the porch light and started looking away from the light. There is a section of the garage that is not directly lighted by the porch light and I can see the roof as well as the shingles with the Z6. With the Z5 I can see the roof but I can't make out the shingles.
The answer is that I know in daylight ther is no difference in brightness in them but the images have more contrast and better resolution in the Z6. Everyone I have had look through them has been able to tell which is the better image even though they are both equally bright.
I hope that helps. I don't know if I would call being able to see the shingles a big difference or not.