I don't know that a front filter will make things clearer.  

I keep a UV photo filter on my scope to protect the objective lens but that's all it does.

The only things that help make the view clearer are larger scopes and cataract surgery.

If you're shooting at red targets, a 5A red camera filter behind the eyepiece will make the holes stand out.

My opinion spotting scope resolution on a typical rifle range is dependent on several things. Objective lens size, distance between objective and Occular lenses, lack of complication like variable power. Solid mounting, no vibration is critical too. I am assuming the scope is from a reputable maker not cheap junk.

Lens coatings generally help resolution in difficult light conditions, rifle range without shadows or adverse sunlight it’s not important.  Shooters eyes are critical and the best resolution aging eyes is cataract surgery. 

Opinion can’t prove any of it 

Boats 

You might try wearing your shooting glasses as you look through your eyepiece to see if that makes a difference. What eyepiece lens do you have on your scope, the 25x?

oneatatime wrote on Oct 29^th, 2025 at 4:36pm:

Yes, 25x. Also have a 60x. Has 77mm Objective. I will search for polarizing filter to try.
Flatlander.

Front of glass is marked 77mm so I am to conclude it is side of thread just like my camera lens. I have read of people having hard time seeing bullet holes but have not seen anyone mention filters. I just thought I may try one. Nothing ventured, nothing gained.
Flatlander.

It’s easy to overpower a spotter with less resolution than a lower power. My Unertl 100 team, just sold after 15 years use, was supplied with 15 24 & 32 x eyepieces. Bought it missing the 32 & used the 24 95% of the time. Had a chance to try a friends 32 eyepiece on our club 600 yard range. It magnified more but was not as clear as the 24. Long distance it picked up more condition problems, my guess, it was humidity mostly. 15 was clearer high humidity days  but lacked magnification needed. It was excellent sighting in new shooters on the berm’s dirt.

Now almost all my 200 - 600 spotting is with a 63x24 Unertl. It’s not as good as the 100mm whole lot easier to carry. 

Gallery 50 feet, 25 yards and at times to 100 yards Rimfire I generally use a rough looking, good glass, Unertl 24x54 mm it struggles with 22 holes at 100

Modern scopes have long been a fan of the now discontinued fixed power Leupold scopes . First was a 25x 50 mm. Very small and useful but a bit too much power. Added a 20x60 mm that’s much clearer than the small scope. Friend bought the same scope 30x60 mm and it does not resolve as well as the 20 to my eye.

Back to the big ones, often setting up the big Unertl someone would compare it to a Kowa. The 28x77 Kowa to my eye resolved as good not better. When the larger Kowas 82 & 88 came out they were superior as long as they had the fixed power Occular lens . Variable lens on any power setting was not as good as the fixed Unertl or Kowa’s. Any of the Kowas are better in bright light flare conditions than the my vintage scopes. The Unertl scopes extended sun shade does help a lot.

On the Bob Zimmerman test. Side by side scope comparison difficult target is a very good method. I’ve always used the same target, fresh crisp dollar bill.

Boats