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Informatii generale despre

binocluri

pagina anterioara

 

1. De ce factori trebuie sa tin cont cand doresc sa achizitionez un binoclu?

2. Ce este diametrul obiectivelor?

3. Ce este campul vizual?

4. Ce este diametrul pupilei la iesire?

5. Ce este relieful ocular?

6. Ce determina luminozitatea imaginii oferite de binoclu?

7. Ce este rezolutia in cazul binoclurilor.

8. Este important contrastul imagii?

9. Ce se intelege prin "near focus"?

10. Straturi optice aplicate. Cat sunt de importante?

11. Prime roof / prisme porro. Care este diferenta?

12. Ce reprezinta puterea de marire a binoclurilor?

13. Ce este distanta interpupilara si cum se regleaza in cazul binoclurilor?

14. Reglarea dioptriilor la binocluri

15. Cum montez binoclul la trepid?

16. De ce obiectele indepartate sunt neclare atunci cand folosesc un binoclu cu putere mare de marire?

 

Click pe sigla Celestron pentru a vedea oferta noastra de monoculare, binocluri si accesorii pentru binocluri

 

1. De ce factori trebuie sa tin cont cand doresc sa achizitionez un binoclu?

Factorii de care trebuie sa tineti cont sunt: diametrul obiectivului, puterea de marire, tipul si calitatea elementelor optice ale obiectivelor, tipul de straturi care au fost aplicate pe lentile, tipul de prisme folosite. In general, sunt de preferat binocluri cu diametrul obiectivelor mare, puteri de marire mici si lentile tratate.

2. Ce este diametrul obiectivelor?

Obiectivele binoclurilor sunt lentilele frontale ale acestora. Diametrul acestor lentile il veti observa exprimat in milimetri in descrirea binoclurilor, fiind reprezentat de al doilea numar. Asdar, un binoclu 7x42 are un dimetrul al obiectivului de 42mm.

Diametrul obiectivelor este deseori inscriptionat chiar pe binoclu.

Diametrul obiectivelor determina puterea de adunare a luminii a instrumentului. O putere mare de adunare a luminii se traduce printr-o imagine mai luminoasa, cu mai multe detalii. Poate fi deosebit de importanta in conditii mai slabe de iluminare.

Dublarea dimensiunii unui obiectiv duce la marirea de 4 ori a puterii de adunare a luminii a instrumentului. De exemplu, un binoclu 7x50 aduna de 3 ori mai multa lumina decat un binoclu 7x35 si de 4 ori mai multa lumina decat un binoclu 7x25.

Ar parea ca un diametru mai mare inseamna mai bine, dar in realitate aceasta valoare trebuie coraborata cu alti factori, cum ar fi diametrul pupilei de iesire sau chiar scopul pentru care doriti sa folositi binoclul.

3. Ce este campul vizual?

Campul vizual al binoclurilor reprezinta latimea ariei pe care o vedeti prin binoclu si este de obicei descris in doua moduri: angular sau linear.

Campul vizual angular reprezinta unghiul real vizibil prin binoclu si se masoara in grade. Campul vizual linear reprezinta latimea ariei observate si se masoara in metri la 1000 de metri sau picioare (ft.) la 1000 de yarzi  (yrd). Valori mari ale campului vizual se traduc intr-o arie mai mare care este vizibila.

Campul vizual este strans legat de puterea de marire a binoclului. O putere mare de marire inseamna un camp vizual ingust. Campurile largi sunt de dorit in special in cazul obiectelor aflate in miscare (ex., pasari care zboara) sau cand dumneavoastra sunteti in miscare (va aflati intr-o masina, barca).

4. Ce este diametrul pupilei la iesire?

Diametrul pupilei la iesire indica latimea razei de lumina care iese din binoclu (in partea cu oculare). Un diametru mare este de dorit in conditii slabe de iluminare.

Pentru aplicatii astronomice, diametrul pupilei ar trebui sa corespunda diametrului pupilei dumneavoastra dupa ce acesta s-a adaptat intunericului. Diametrul va trebui sa fie intre 5mm si 7mm. 7mm este diametrul maxim la care poate ajunge pupila umana. Diametrul pupilei umane tinde sa scada o data cu varsta. In general, in jurul vartei de 50 de ani diametrul pupilei poate ajunge la o valoare de 5mm.

Pentru a calcula diametrul pupilei la iesire, impartiti diametrul obiectivului la puterea de marire. De exemplu, diametrul pupilei de iesire a unui binoclu 7x42 este 42/7=6mm

5. Ce este relieful ocular?

Relieful ocular este distanta (exprimata in milimetri) la care binoclul poate fi tinut in relatie cu ochii, astfel incat intregul camp vizual sa poata fi observat confortabil.

Relieful ocular ar trebui sa fie cel putin 10mm, 15mm pentru un confort optim, poate chiar mai mult daca purtati ochelari.

6. Ce determina luminozitatea imaginii oferite de binoclu?

Atunci cand comparati doua binocluri este important sa luati in considerare luminozitatea lor. Luminozitatea are impact direct asupra capacitatii binoclului de a va oferi imagini chiar si in conditii slabe de iluminare. Calitatea contrastului si a culorilor imaginii depind si ele de luminozitate.

Luminozitatea este direct influentata de urmatorii factori: diametrul obiectivelor, capacitatea componentelor optice  de transmisie a luminii, puterea de marire. Straturile cu care sunt trate suprafetele optice permit ca mai multa lumina sa treaca. Daca vom compara doua binocluri cu diametre ale obiectivelor egale dar cu puteri de marire diferite, binoclul cu o putere mai mica de marire va fi mai luminos. Ex.: 7x50 este un binoclu mai luminos decat 15x50.

Pentru a afla mai mult