Nikon Side Focus

The Monarchs are a better scope period with better glass and coatings and will be brighter than a buckmaster. Usually you divide objective size by zoom setting and that gives you exit pupil size and that would give you relative brightness. But the Monarch has better glass so a straight comparison like that is not valid. If you can afford it get the monarch. If you cannot afford a Monarch get a Team Primos 3-9x40 as it is a Monarch UCC with a BDC reticle and a different name to trick you into not thinking it is a Monarch for $220, but that is what it is.

Oh and to the original topic side focus is worth it if you are a long range target shooter and need a side focus to quickly adjust for parallax. Otherwise the rear focus does the same thing. I hunt and have never touched the focus ring
 
I agree with many of lipadj46's comments and suggestions. For the math challenged you can usually find the exit pupil listed on SWFA.com or MidwayUSA. But keep in mind that age plays a limiting factor. An 18y/o with sharp eyes might make use of 7mm, but as we age that drops off. I can't remember the exact number but if memory serves it's around 4-4.5mm by age 40. In hard light transmissions numbers a Monarch is a better scope than a Buckmaster. The Buckmaster passes 92% and a Monarch 95%.

But keep in mind that a a larger objective has a big downside. Because they have to be mounted higher it can be a bit harder to achieve a good consistent cheek weld and that effects shooter accuracy.

Oh and to the original topic side focus is worth it if you are a long range target shooter and need a side focus to quickly adjust for parallax.
This is exactly true and really anytime you exceed 10x magnification it's nice to be able to both sharpen the image and correct out parallax errors. Whether you choose side focus or an adjustable objective (front focus) parallax correction is very important for precision target work. On the other hand stopping to fiddle with focus can slow down getting an accurate shot off.

Otherwise the rear focus does the same thing. I hunt and have never touched the focus ring
The rear focus ring on most modern scopes is only used for focusing the cross hairs and not to bring the target into focus.
 
Look at the www.swfa.com website in their chat room many knowledgeable people say the Nikon while having great glass is not as rigid as the Leupolds or Elites 4200, 6500. They are more easily jarred off of their settings than other brands. I found that to be true with my Nikon. My Leupolds can take far more abuse.
 
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