Nikon PROSTAFF P7 vs MONARCH M5

An upgrade should solve a problem you actually notice. Moving from PROSTAFF P7 8×42 to MONARCH M5 8×42 brings ED glass, but it also reduces the published field from 126m to 112m at 1,000m. That is a 14m loss in scanning width, or about 11% of the P7's field (14 ÷ 126). The M5 also adds 40g, about 7% of the P7's weight, while stated eye relief falls only 0.7mm and close focus improves by 0.5m. An “M” badge alone does not decide which combination works better for birds. These published differences identify the purchase trade; they do not quantify an ED-related sharpness gain.

The case for the PROSTAFF P7

The P7's broad field is valuable for tracking flight and searching reedbeds. At 590g it is 40g lighter than the M5. Nikon publishes 20.2mm eye relief, so it is a particularly strong glasses candidate, subject to a real fit check. The locking dioptre keeps your individual focus setting from being knocked, and the external lens surfaces have a water/oil-repellent coating.

It lacks ED objectives in Nikon's published description. Around dark branches against a bright sky, that may be the strongest reason to examine an upgrade. Yet P7 already has phase-corrected roof prisms and dielectric reflective coating, so the comparison is not “ordinary glass versus all optical treatment”.

The case for the MONARCH M5

M5 uses extra-low-dispersion glass to reduce colour fringing. It closes focus to 2.5m rather than P7's 3m, a small but useful difference for garden subjects or butterflies. Its 19.5mm eye relief remains generous on paper. At 630g it is still a manageable full-size body, though not the lighter option.

The narrower 112m field matters if your main subject is a fast bird in mixed habitat. It may matter less if you concentrate on perched or settled subjects and value a cleaner high-contrast edge. This is a model-specific trade-off, not a claim that ED never helps. See is ED glass worth it? for the optical context.

Do not confuse the 8× and 10× comparisons

In 10×42, Nikon publishes 122m for P7 and only 98m for M5. The gap is more dramatic than with these 8×42 models. The M5 10×42 does, however, offer 18.4mm eye relief versus P7's 15.7mm, so glasses may reverse the priority. If that is the format you are choosing, see best 10×42 binoculars rather than assuming the same answer.

How to decide in a shop or field

Use both on a high-contrast branch or sign, then move to a flying or walking subject. With your usual glasses, can you see the complete field on each? Is the M5's ED-related cleanliness noticeable to you, and does it outweigh the narrower field? Check the focus wheel and eyecup stops. If the P7 already gives an easy, broad, relaxed image, the M5 upgrade is optional. If colour fringing distracts you and the M5 fits, its extra cost may be justified.

Decide by what you miss in the field

If you lose fast birds at the edge of the view, P7's wider published field is a benefit every time you acquire one. If you usually study a stationary bird against a bright sky and coloured outlines distract you, M5's ED objectives give a concrete reason to try it. Close-focus distance favours M5 modestly, but a subject at 2.7m is relevant only if you genuinely watch birds, insects or flowers at that range. The MONARCH name alone cannot settle these different tasks.

Neither model's stated eye relief guarantees a complete view through every pair of spectacles. Try both with your normal frames; then move your eye slightly around the exit pupil and see whether the image cuts off. A small numerical advantage for P7 should not override an M5 that fits you better in practice. Likewise, published weight is only part of comfort: note where your fingers rest, how the barrels balance and whether the focus wheel can be operated without changing grip.

At checkout, confirm that both offers are the exact 8×42 variants used in this comparison. Mixing a 10×42 field figure with an 8×42 price creates a false bargain. If the price gap is large, decide which specific gain you would buy; if neither matters on your usual subjects, keeping the broader P7 view is a rational outcome, not a refusal to upgrade.