Setting up the magnetic filter system involves removing your lens from your existing lensholder and install it into the 25mm magnetic lensholder, shown in upper left in the picture. You will see 3 little round black dots around the lensholder ring, those are the magnets. This lensholder can be used whether you use filters or not, the magnets do not interfere with the lens in any way.

The second step is to add the magnetic filter holder to the magnetic lensholder, shown in upper right in the picture. This is the gray plastic ring with 3 corresponding magnets and a slot in the middle to hold the filters. This filter holder can be attached to (or removed from) the magnetic lensholder while you are wearing the glasses and the position is guaranteed to be correct due to the magnets.

The filters in the picture are, left to right in the middle row: orange, brown, gray; then left to right in the bottom row: yellow, 25% purple, 40% purple. I have an article explaining the use of different filters in various lighting conditions. Please see: http://www.precision-sports.com/custmset.htm. Those are guidelines, since no two persons have the exact same eyes or perceive color the exact same way, the effects of each filter may differ slightly from person to person.

Each filter is inserted into the slot in the middle of the gray plastic magnetic filter holder with the convex surface facing forward (target side), then put on in front of the lensholder using the magnets. When you need to change a filter, you have to take the filter holder off (but no need to remove your glasses), slide the filter out, slide another filter in, clean the lens, then put it back on the magnetic lensholder.

When you remove or insert the filters, you have to hold the front and back of the lens with your fingers using a piece of microfiber cloth to protect the lens surface. The same cloth, if clean, may be used to wipe the lens every time it is used.

The plastic filter holder when new is quite tight. The filters do not just freely drop in and drop out. You don't want a loose filter holder where filters can fall out of it accidentally. You have to push firmly, using a slight rotation or wiggly motion. Over time, once the plastic is conditioned, inserting and removing filters will be easier.

Here's how I did it:
First put the filter on in front of the lensholder. Use one hand to hold both the filter and lensholder rings so that these two rings are separated as far as the three little hooks allow, leaving a gap in between them. Then carefully insert the clip on the iris to the lensholder making sure the tip gets inserted in between the filter ring and the lensholder ring. Maintain the position of the filter and then insert the second clip of the iris onto the lensholder. Check the position of both the lensholder and the filter. At this point the filter ring might by tipped to one side slightly, correct it with a finger so it remains parallel to the lensholder, then insert the third clip of the iris onto the lensholder. All three tips of the iris clips should be inserted between the filter and the lensholder. Please the attached sketch.

If you try to put the iris on first, it will be even more difficult to put the filter on afterwards, that is my experience. But if you find it easier for yourself the other way around, then good for you - whatever works, works :-) The basic idea is that you try to provide as much space as possible in between while you insert the plastic clips.

1. Yellow and orange filters, light to medium densities:
   • ...absorbs violet, provides clearer bull's eye outline, accepted by most shooters.
2. Dark brown or gray filters, light to medium densities:
   • ...absorbs entire spectrum, reduces glare from directly sun-lit targets, the yellow portion impedes violet.
3. Neutral gray with green shading:
   • ...impedes violet to a lesser extent than gray filters, but the green portion is pleasant to the eye for some shooters.
4. Dark yellow, orange, and yellow green filters:
   • ...brings out contrast, most suitable on sunny / overcast days, hazy but bright conditions, or early morning or late afternoon.
5. Yellow green, medium to high density:
   • ...removes excessive brightness.
6. Polarized filters:
   • ...when two polarized filters are rotated against each other, the amount of light passing through the lenses gradually changes. This allows infinite adjustment of filtering density to almost total darkness.

• age : older shooters may need more effort to focus, and stayed focused, on the target / front sight ( as the case may be );
• eye condition : near- or far-sightedness, astigmatism,...etc;
• sensitivity of eye : some people have eyes more sensitive to strong light than others ( e.g. must wear sunglasses outdoors or driving...etc);
• psychological : " I just feel better this way... "

With shooting glasses, you should start out with the best you can afford. The reason is that once you have gone through the many steps to set up your glasses properly, you really do not want to do it all over again just because now you want to upgrade to a better set. One set of glasses is good for many years. Mine is twelve years old and is still excellent ( but that of course requires that you use it properly and takes good care of maintaining it in tip top condition ).

That said, our best glasses is the Olympic Champion. With the micrometer adjustments and titanium frame, there are no equals on the market. It is easy to set up, and it lasts for a long time.

The Olympic Offset Champion is designed for archers or rifle shooters in standing positions who use an extreme aiming position, and the lens must be place right in the middle of the frame.

The cheaper version of that is the World Champion 2. This has an aluminium frame instead of titanium, and adjustment is by set screws and sliding blocks.

For those who needs to wear prescription glasses, they may want to purchase an extra lens-holder assembly for the non-aiming eye, so they can do other things at the bench such as loading the magazine, sighting the scope...etc. while they are not shooting.

People with astigmatism may want to purchase the adjustable iris diaphragm to help obtain the best possible image.

When you shoot outdoors in bright sun light you may want to have the grey or brown filters. In overcast days you may want yellow or orange filters.

If you are not wearing a shooting cap and want to block off extra side light or help your concentration, you may want the side shields.

During the initial set up process you may want the centering device to help you determine if your lens is located perfectly center with your aiming eye.

These are the most common accessories people would want to purchase. Some bought everything together to save shipping charges, some buy them one piece at a time when they feel there is the need. Whether you need all these at once must be decided by none other than yourself, because you know your own needs best.