請 指導 如何 選擇 bino
各位師兄師姐,我是一新丁,已有一個 Minox BV 8x25 (太太送的禮物),覺不夠光,太太用的 BV 10x42 比較光, 我正研究什麼望遠鏡才適合我,但有些問題解決不了,請指教。 (前題: 不怕重量)
1. My lay thinking makes me to think that a larger objective lens allows me to see more, but looking at the Field of View (FOV) of the Minox BV series, the FOV goes down with larger objective lens, from 421 f @ 1,000 yd (8x33) to 389 (8x42) to 342 (8x56). Difficult to understand.
2. My BV 8x25’s FOV is 358 yd @ 1,000 yd, while the BV 10x42’s FOV is 342. But the image I saw in the 8x25 is smaller than the image in the 10x42. Why?
3. If I exercise my lay reasoning that a larger objective lens give a bigger image, similar to using a 19-inch computer monitor vs a 15-inch monitor (everything else equal), will I get a larger image with a 10x52 (e.g. the Minox BL 10x52 FOV 342 ft) compared to my wife’s BV 10x42 (FOV also 342 ft) ?
4. If a larger objective lens gives a bigger image, can I choose a lower magnification but a bigger objective lens, e.g. instead of choosing BV 10x42, I choose BV 8x56, the FOV are the same, but to expect the ’56 will give a larger image of the shrunken in size by the 8x (instead of 10x)? But then the brightness factor will increase from 17.64 (10x42) to 49 (8x56)!
5. The twilight factor is most difficult to understand, a high magnification bino easily gives a higher twilight factor. If I found that the colours are usually darkened (from blue to black, from brown to black etc.) when looking from underneath a tree in shade, and I want less colour distortion, do I need a bino with a higher magnification or a bigger objective lens? E.g. the twilight factor of Minox BL 10x44 is 20.98 and that of BL 8x52 is 20.4, is the colour distortion less with the 10x44 or the 8x52?
多謝指教。