Op­ti­cron Ad­ven­turer II WP 10x42 binoc­u­lars

You'd be hard pressed to find a bet­ter pair of binoc­u­lars for the price

Sky at Night Magazine - - CONTENTS - WORDS: STEPHEN TONKIN

Binoc­u­lars that are light, com­pact and wa­ter­proof are ideal ‘take any­where’ in­stru­ments, which is why we were so keen to try the Ad­ven­turer II WP 10x42s – an up­dated model in Op­ti­cron’s en­try-level ‘Ad­ven­turer’ roof-prism range.

The binoc­u­lars are supplied in a soft, lightly padded case with a belt loop, a de­tach­able shoul­der strap and a mi­crofi­bre clean­ing cloth. The un­padded neck strap of the binoc­u­lars them­selves is a com­fort­able 38mm wide. When you hold the binoc­u­lars up to the light, each of the exit pupils is per­fectly cir­cu­lar, in­di­cat­ing that the prisms are ad­e­quately sized. We mea­sured the exit pupil at 4.2mm, con­firm­ing that the binoc­u­lars are not stopped down in­ter­nally to mask op­ti­cal aber­ra­tions; this gives the Ad­ven­turer II a greater ef­fec­tive aper­ture, and hence po­ten­tially bet­ter light-gath­er­ing abil­ity, than some binoc­u­lars that are nom­i­nally 10 50s.

The fo­cus mech­a­nism has a smooth, pos­i­tive feel and in use we found that stars snapped to a crisp fo­cus. The im­ages from each side were per­fectly merged, show­ing that col­li­ma­tion was spot on. When you re­fo­cus from a near ob­ject to a dis­tant ob­ject, you will find that there is still three quar­ters of a turn of the fo­cus wheel re­main­ing. If you are short­sighted, you will be able to use this ex­tra fo­cal range to ob­serve with­out cor­rec­tive lenses. The eye re­lief (the ideal dis­tance of your eye from the binoc­u­lar lenses) is spec­i­fied as 15mm but, even with the Ad­ven­turer II’s eye cups fully down, this was in­suf­fi­cient to al­low the whole field of view to be vis­i­ble with spec­ta­cles. This could make them un­suit­able if you need spec­ta­cles to cor­rect for astig­ma­tism.

Dis­tor­tions be gone

There was very mild pin­cush­ion dis­tor­tion no­tice­able at the edge of the field of view. This makes straight lines ap­pear to bow in­wards, but also coun­ter­acts an un­pleas­ant ef­fect called ‘rolling ball’, which is present if there is no dis­tor­tion.

Con­trol of false colour was very good on axis, and even a gib­bous Moon showed only min­i­mal colour fring­ing when the limb or ter­mi­na­tor was near the edge of the field of view. False colour on bright stars such as mag. 0.0 Vega in Lyra was barely per­cep­ti­ble. There was some lens flar­ing when the Moon was just be­yond the field of view, and when

SKY SAYS… They are not stopped down in­ter­nally, so have po­ten­tially bet­ter light-gath­er­ing than some nom­i­nal 10◊50s

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