The lens on a camera has only two tasks. First, it must gather in as much light as possible in order to activate the sensitive chemicals on the film. Second, it
B. inggris
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Pertanyaan
The lens on a camera has only two tasks. First,
it must gather in as much light as possible in
order to activate the sensitive chemicals on the
film. Second, it must organize the light rays so
that they form a sharp image on the film.
These may so und like simple tasks, but they are
not.
One of the sharpest lenses is merely a pinhole in
a sheet of cardboard, metal, plastic, or a similar
material. If the pinhole is tiny enough, the
image can be quite sharp, but then very little
light is admitted. For most purposes, even the
most sensitive film would take too long to
record an image.
A glass lens is much better because it lets in
much more light and focuses it on the film. Yet
simple glass lenses are sharpest only in their
centers. As more o f the lens is used, the image
suffers in sharpness.
One reason a simple lens can cause problems is
that it is shaped like a section of a sphere.
Spherical lenses do not focus perfectly on flat
film, so the image is slightly distorted, especially
at the edges. Another reason is that the lens
can act partly like a prism. This means that
some of the colors in the image will not focus
properly, and the image will be fuzzy.
One solution is to block off all but the sharp-
focusing center of the lens. If you block off the
edges of the lens, however, less light will get to
the film. Early lenses had to compromise
between sharpness and light-gathering power.
Very sharp lenses that admit as much light as
possible can be built by making them with
several separate lenses, or elements. A
multiple-element lens has from two to nine
separate lenses. Some elements are cemented
together, and some have a gap between them.
Furthermore, the elements are often made of
different kinds of glass, each with a different
ability to bend light rays. Some of the elements
are there just for correcting problems caused by
the other elements! The results are worth it,
though: pictures can be taken in many different
light conditions, and they have a sharpness you
can almost feel.
it must gather in as much light as possible in
order to activate the sensitive chemicals on the
film. Second, it must organize the light rays so
that they form a sharp image on the film.
These may so und like simple tasks, but they are
not.
One of the sharpest lenses is merely a pinhole in
a sheet of cardboard, metal, plastic, or a similar
material. If the pinhole is tiny enough, the
image can be quite sharp, but then very little
light is admitted. For most purposes, even the
most sensitive film would take too long to
record an image.
A glass lens is much better because it lets in
much more light and focuses it on the film. Yet
simple glass lenses are sharpest only in their
centers. As more o f the lens is used, the image
suffers in sharpness.
One reason a simple lens can cause problems is
that it is shaped like a section of a sphere.
Spherical lenses do not focus perfectly on flat
film, so the image is slightly distorted, especially
at the edges. Another reason is that the lens
can act partly like a prism. This means that
some of the colors in the image will not focus
properly, and the image will be fuzzy.
One solution is to block off all but the sharp-
focusing center of the lens. If you block off the
edges of the lens, however, less light will get to
the film. Early lenses had to compromise
between sharpness and light-gathering power.
Very sharp lenses that admit as much light as
possible can be built by making them with
several separate lenses, or elements. A
multiple-element lens has from two to nine
separate lenses. Some elements are cemented
together, and some have a gap between them.
Furthermore, the elements are often made of
different kinds of glass, each with a different
ability to bend light rays. Some of the elements
are there just for correcting problems caused by
the other elements! The results are worth it,
though: pictures can be taken in many different
light conditions, and they have a sharpness you
can almost feel.
1 Jawaban
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1. Jawaban khalimah16
Kiat: Telusuri hasil dalam bahasa Inggris saja. Anda dapat menentukan bahasa penelusuran di Preferensi
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Lensa pada kamera hanya memiliki dua tugas. Pertama, itu harus mengumpulkan sebany...Lainnya
---------------AfrikaansAlbaniaAmharikArabArmeniaAzerbaijaniBasqueBelandaBelarusiaBengaliBosniaBulgariaBurmaCebuanoCheskaChina (Aks. Sederhana)China (Aks. Tradisional)DanskEsperantoEstiFilipinoFrisia BaratGaelik SkotlandiaGalisiaGeorgiaGujaratHausaHawaiiHindiHmongHungariaIbraniIgboIndonesiaInggrisIrlandiaIslandiaItaliaJawaJepangJermanKannadaKatalanKazakhKhmerKirgizKoreaKorsikaKreol HaitiKroasiaKurdiLaoLatinLatviLituaviLuksemburgMakedoniaMalagasiMalayalamMaltaMaoriMarathiMelayuMongoliaNepaliNorwegiaNyanjaPashtoPersiaPolskiPortugisPrancisPunjabiRumaniaRusiaSamoaSerbShonaSindhiSinhalaSlovakSlovenSomaliSotho SelatanSpanyolSundaSuomiSwahiliSwediaTajikTamilTeluguThaiTurkiUkrainaUrduUzbekVietnamWelshXhosaYiddishYorubaYunaniZuluIndonesia
Masukan
Tukar ke Inggris
Lensa pada kamera hanya memiliki dua tugas. Pertama,
itu harus mengumpulkan sebanyak mungkin cahaya masuk
untuk mengaktifkan bahan kimia sensitif di
film. Kedua, ia harus mengatur sinar cahaya itu
bahwa mereka membentuk gambar yang tajam di film.
Ini mungkin sangat tidak seperti tugas sederhana, tapi memang begitu
tidak.
Salah satu lensa paling tajam hanyalah lubang jarum di dalamnya
selembar kardus, logam, plastik, atau sejenisnya
bahan. Jika lubang jarum itu cukup kecil, maka
Citra bisa sangat tajam, tapi sedikit sekali
cahaya diterima Untuk sebagian besar tujuan, bahkan
Film paling sensitif akan memakan waktu terlalu lama
rekam gambar
Lensa kaca jauh lebih baik karena memungkinkan masuk
jauh lebih ringan dan memfokuskannya pada film. Namun
Lensa kaca sederhana paling tajam hanya di lensa mereka
pusat. Karena lebih banyak lensa yang digunakan, gambarnya
menderita dalam ketajaman
Salah satu alasan lensa sederhana bisa menimbulkan masalah adalah
itu berbentuk seperti bagian bola.
Lensa spherical tidak fokus sempurna pada datar
Film, jadi gambarnya sedikit terdistorsi, terutama
di tepi. Alasan lainnya adalah lensa itu
Bisa bertindak sebagian seperti prisma. Ini berarti itu
Beberapa warna pada gambar tidak akan fokus
Benar, dan gambarnya akan kabur.
Salah satu solusinya adalah memblok semua tapi tajam-
pusat fokus lensa. Jika Anda memblokir
Tepi lensa, bagaimanapun, cahaya yang kurang akan sampai ke
film. Lensa awal harus kompromi
antara ketajaman dan kekuatan pengumpulan cahaya.
Lensa yang sangat tajam itu mengaku sama ringannya
mungkin bisa dibangun dengan cara membuatnya
beberapa lensa terpisah, atau elemen. SEBUAH
Beberapa elemen lensa memiliki dua sampai sembilan
lensa terpisah Beberapa elemen disemen
bersama, dan beberapa memiliki celah di antara keduanya.
Selanjutnya, unsur-unsurnya sering dibuat
Berbagai jenis kaca, masing-masing berbeda
kemampuan menekuk sinar cahaya. Beberapa elemen
apakah ada hanya untuk memperbaiki masalah yang disebabkan oleh
elemen lainnya! Hasilnya sangat berharga,
Meskipun: gambar bisa diambil dalam berbagai hal
kondisi ringan, dan mereka memiliki ketajaman Anda
hampir bisa terasa