English term
Türkiye
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Native in: Persian (Farsi)
Works in: English, Persian (Farsi) to English, English to Persian (Farsi)
Φ148 x 111.3 mm (Ø5.8” x 4.4”)
I am translating a camera User Guide. I need to know what the symbols Φ and Ø represent.
Dimensions (Ø x H) = Φ148 x 111.3 mm (Ø5.8” x 4.4”)
Many Thanks
Apr 5, 2018 15:33: B D Finch changed "Level" from "PRO" to "Non-PRO"
PRO (1): Hazem Zaki
Non-PRO (3): Tony M, Catharine Cellier-Smart, B D Finch
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Responses
Egypt
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Native in: Arabic (Variants: Syrian, Egyptian)
Works in: English to Arabic, Arabic to English, English
Diameter
both Φ and Ø are the same.
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Note added at 44 mins (2018-04-04 18:57:26 GMT)
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As Tony mentioned, you have to pay extra care in your document for the difference between Ø with a slash, which usually denotes "Diameter", and Φ, which is the greek symbol of "Phi".
in the case of your question, both (the second is sure by mistake) denote Diameter.
Mexico
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Native in: English 
, Spanish , French 
Works in: English to Spanish, English to French, French to Spanish, and 6 more.
Φ=Phi ////////Ø = diameter
(mathematics) The golden ratio, an irrational number with a value of approximately 1.618033988 which expresses the relationship that the sum of two quantities is to the larger quantity as the larger is to the smaller.
Ø = diameter
The diameter symbol (⌀) (Unicode character U+2300) is similar to the lowercase letter ø, and in some typefaces it even uses the same glyph, although in many others the glyphs are subtly distinguishable (normally, the diameter symbol uses an exact circle and the letter o is somewhat stylized). The diameter symbol is used extensively in engineering drawings, and it is also seen anywhere that abbreviating "diameter" is useful, such as on camera lenses. For example, a lens with a diameter of 82 mm would be labeled ⌀ 82 mm.
| neutral |
Tony M
: Yes, but that's not really going to help solve Asker's problem, is it, since 'phi' is clearly wrong here – it's just an erroneous use of the wrong symbol.
2 mins
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| neutral |
Daryo
: The golden ratio is a ratio [dimension 0] so it can't make any sense here - what's the point of mentioning it?
1 hr
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United Kingdom
Translator since 1953
Native in: English
Works in: Russian to English, German to English, English
Φ = power, Ø = diameter
ecee.colorado.edu/~mcleod/pdfs/OESD/lecturenotes/ThickLenses.pdf
ECE 5616 OE System Design. Robert McLeod. 84. Gaussian design aka thick lenses. •Design of ideal imaging systems with geometrical optics. –Gaussian design. Thick lenses are fully characterized by three quantities: 1. Effective focal length (F) or power (1/F=Φ). 2. Front principal plane, P. 3. Rear principal plane, P'. P'. F.
Image Formation in the Ray Model
https://www.cis.rit.edu/class/simg303/Notes/Ch9-ImageFormati...
IMAGE FORMATION IN THE RAY MODEL. We often use the 0power1 φ instead of the focal length f to describe the lens, since the powers add. 2. PlanoMconvex lens, plane side forward: rQ. ] &∞. rR. \ P. Q. оQ. K. Q о'R. ] −. HиR − QI. rR. ] HиR − QI. гrRг. ^ P б ]. гrRг. иR − Q. G RгrRг. 3. PlanoMconcave, plane side forward:.
Reference comments
popular model for the box containing a dome camera
https://www.google.co.uk/search?q="Φ148 x 111.3 mm (Ø5.8” x ...
if you go through all the ghits you get about 150 dome cameras whose external dimensions are described exactly as "Φ148 x 111.3 mm (Ø5.8” x 4.4”)"
plain obvious that "Φ" is a mistake/typo that keeps being copied from one spec sheet to another - no point dwelling on what "Φ" should/could mean.
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