Lensa fotografi: Perbedaan antara revisi
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''Soft focus'' adalah sebuah efek pada [[fotografi]] yang disebabkan oleh [[blur]] akibat [[aberasi speris]] lensa. Sebuah lensa fokus halus didesain untuk menimbulkan efek blur tersebut namun tetap menjaga ketajaman setiap garis dari subjeknya. Efek ''soft focus'' yang ditimbulkan oleh lensa ini tidak sama dengan efek ''out of focus'' yang disebabkan posisi subjek di luar bidang fokus.
Contoh lensa fokus lunak adalah [[Canon EF 135mm f/2,8 with Softfocus]]<ref>
=== [[Lensa sudut lebar]] ===
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Istilah ''prime lens'' pada awalnya mempunyai arti '''lensa utama''' pada sebuah kombinasi sistem lensa.<ref>{{cite book|title = The British Journal of Photography|publisher = Liverpool Photographic Society|year = 1967|edition = v.115|url = http://books.google.com/books?id=ZIAqAAAAMAAJ&q=prime-lens+date:0-1950&dq=prime-lens+date:0-1950&lr=&as_brr=0&ei=M-WvR5rJJ5aytgOZsuSDBg&pgis=1 }}</ref> Ketika sebuah lensa digunakan bersamaan dengan misalnya ''teleconverter'', lensa tersebut sering disebut ''prime lens'' yang berarti lensa yang utama, dan ''teleconverter'' sebagai komponen tambahan ([[bahasa Inggris|en]]:''auxiliary'').
Beberapa pabrikan lensa seperti ARRI Media,<ref>{{cite web|url=http://www.arrimedia.com/productlist.php?catalog_id=193 |title=ARRI Variable Prime Lenses |accessdate=2007-11-19 |work=ARRI Media }}</ref> ISCO Precision Optics,<ref>{{cite web |url=http://iscoprecisionoptics.com/Downloads_new/Product_information/ISCO_PL_VP_System_US_02_2007.pdf |title=Variable Prime System for 35 mm Film |accessdate=2007-11-19 |work=ISCO Precision Optics |archive-date=2007-10-19 |archive-url=https://web.archive.org/web/20071019131554/http://www.iscoprecisionoptics.com/Downloads_new/Product_information/ISCO_PL_VP_System_US_02_2007.pdf |dead-url=yes }}</ref> Schneider Kreuznach,<ref>{{cite web|url=http://www.schneideroptics.com/ecommerce/CatalogSubCategoryDisplay.aspx?CID=67 |title=Variable Prime |accessdate=2007-11-19 |work=Schneider Optics }}</ref> Carl Zeiss,<ref>{{cite web |url=http://www.oscars.org/scitech/1998/winners.html |title=1998 Scientific & Technical Awards Winners |accessdate=2007-11-19 |work=Academy of Motion Picture Arts and Sciences |archive-date=2007-12-08 |archive-url=https://web.archive.org/web/20071208130140/http://www.oscars.org/scitech/1998/winners.html |dead-url=yes }}</ref> Canon<ref>{{cite web|url=http://wwwdb.oscars.org/ampas/plsql/ampas_award.detail?primekey_in=1999070715:59:34802212511 |title=AMPAS Award |accessdate=2007-11-19 |work=Academy of Motion Picture Arts and Sciences }}</ref> masih memasarkan produk lensa variabel mereka dengan istilah ''variable prime'' sehingga dapat menimbulkan kesan seakan-akan produk tersebut berupa lensa parfokal.
=== [[Lensa normal]] ===
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* {{en}} [http://www.the-digital-picture.com/Canon-Lenses/Zoom-Vs-Prime-Lens.aspx Zoom vs. Prime Lenses]
* {{en}} [http://www.largeformatphotography.info/soft-focus.html Soft-Focus Lenses and Techniques], an overview for [[large format]] photographers
* {{en}} [http://www.forrestcroce.com/Articles/DigitalSoftFocus.html Article on creating the soft-focus effect in Photoshop.] {{Webarchive|url=https://web.archive.org/web/20081224012500/http://forrestcroce.com/Articles/DigitalSoftFocus.html |date=2008-12-24 }}
* {{en}} [http://www.photozone.de/3Technology/lenstec5.htm Information on Catadioptric mirror lenses] {{Webarchive|url=https://web.archive.org/web/20061012073945/http://www.photozone.de/3Technology/lenstec5.htm |date=2006-10-12 }}
* {{en}} [http://www.shutterbug.com/equipmentreviews/lenses/0103sb_telephoto/ Further clarification: Why Telephoto?]
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