Question
|
Answer
|
| Do
they resolve fine details both at the center and at the edge of
the image? |
|
| Do
they display a bright, high-contrast image? |
|
| Do
they show colors accurately? |
|
| Are
all the air-to-glass surfaces coated, to cut down on internal reflections?
|
|
| Are
they a roof-prism or Porro-prism design? |
|
| If
they're a roof prism design, do they have anti phase-shift coatings?
|
|
| Do
they have a relatively flat field of view? The image shouldn't seem
to curve or bow. |
|
| What
is their field of view? Do they show a big, eye-filling picture?
|
|
| How
easy is it to bring the image into precise focus? |
|
| How
close can they focus? |
|
| Does
the level of magnification match your ability to hand hold them?
|
|
| How
likely are you to have them with you when you need them? Do they
seem bulky? |
|
| Can
you carry them comfortably for hours at a time? |
|
| If
you wear glasses, do they have long enough eye relief so you can
see the whole picture? |
|
| Is
it easy to adjust the eyecups up or down for glasses wearers? |
|
| If
you plan to use them at twilight or dusk, how large are the exit
pupils? |
|
| How
do they fit your hands? |
|
| Is
the surface pleasant to touch and secure to grip? |
|
| Is
the focus knob located to suit you? Does it turn smoothly? Is there
a lot of slop? |
|
| Where
is the diopter adjustment? Is it likely to get accidentally bumped
off its setting? |
|
| How
rugged is the internal construction? Can they take heavy use? |
|
| Are
they rubber armored? |
|
| Are
they actually waterproof, able to survive immersion? Or just water
resistant? |
|
| Are
they nitrogen filled so they won't fog up internally? |
|
| How
do they mount on a tripod? |
|
| Do
they come with a case? |
|
| What
are the provisions for protecting the lenses when in the field?
Are they practical? |
|
| What's
the warranty? |
|
