>>1892134

0/10

For any illegal content, please contact me so that I can immediatly destroy it!

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Ok. Prime lenses.

most are in multiples of 5.

30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 85mm, 90mm, 105mm, 135mm, 200mm, 300mm, 400mm, 600mm.

Why is there 24mm and 28mm... Wouldn't 25mm be a better fit?

most are in multiples of 5.

30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 85mm, 90mm, 105mm, 135mm, 200mm, 300mm, 400mm, 600mm.

Why is there 24mm and 28mm... Wouldn't 25mm be a better fit?

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>>1892134

0/10

0/10

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>>1892137

0/10 on a legitimate question?

I understand the 14mm, 17mm etc on crop cameras based on what the FF equivalent will be. But 24 and 28mm been there since film days.

0/10 on a legitimate question?

I understand the 14mm, 17mm etc on crop cameras based on what the FF equivalent will be. But 24 and 28mm been there since film days.

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>>1892134

Not sure, but maybe it relates to the angle of view? like, a 60 degree field of view could relate to 24mm or something. That way the whole numbers are in the degree, rather than the focal length required to achieve it.

>ihavenoideawhatimdoing.jpg

Not sure, but maybe it relates to the angle of view? like, a 60 degree field of view could relate to 24mm or something. That way the whole numbers are in the degree, rather than the focal length required to achieve it.

>ihavenoideawhatimdoing.jpg

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>>1892147

now that sounds logical. thx.

now that sounds logical. thx.

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>>1892142

There are plenty of 21mm and 25mm lenses so not sure what your point is

There are plenty of 21mm and 25mm lenses so not sure what your point is

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>>1892154

25mm, multiple of 5.

I'll add 21mm to my question. Why not 20mm?

25mm, multiple of 5.

I'll add 21mm to my question. Why not 20mm?

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They're done in roughly multiples of seven, not five. You start with 42 as the perfect normal. Add seven for 49 (eg 50). Subtract seven for a wide normal (35), seven again for a wide (28), seven again for ultrawide (21), seven for ultra-ultra wide.

Going up you have 85 (actually 84), 105, 133 (rounded up to 135), and the now-omnipresent 70-210.

Going up you have 85 (actually 84), 105, 133 (rounded up to 135), and the now-omnipresent 70-210.

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>>1892158

and this is the answer i was looking for. interesting. so the 7 answers why there is 14mm, 21mm, 28mm. Good.

/thead.

and this is the answer i was looking for. interesting. so the 7 answers why there is 14mm, 21mm, 28mm. Good.

/thead.

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>>1892156

mfw i can't math

mfw i can't math

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They make 12mm 15mm 11mm 20mm 19mm 17mm 16mm 25mm and all sorts of in betweens what are you guys even suggesting?

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While the early history of camera lenses and their focal lengths is by no means completely guided by one common rule... the Square root of 2 may have a lot to do with it.

Look at the standard f-stops. They are in multiples of the square root of 2 (~1.41). i.e. 2.0 x 1.41 is about 5.6... 8 x 1.41 is about 11. Do this for 1.4, 2.8, 5.6, 8, 11, 16, 22

Do the same thing with common focal lengths.

24mm x 1.4 = 34 (round to 35).

35mm x 1.4 = ~50mm

50mm x 1.4 = ~70mm (used to be a popular focal length)

What about 28mm?

Well - 28mm x 1.4 = ~40mm... a popular "normal" focal length, particularly earlier on. Actually, if you take the diagonal of 35mm film, it's closer to 40mm than 50mm. The "proper" normal field of view has been the subject of some debate.

This rule doesn't answer all questions about popular focal lengths... but it's good enough for a good conspiracy theory.

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Look at the standard f-stops. They are in multiples of the square root of 2 (~1.41). i.e. 2.0 x 1.41 is about 5.6... 8 x 1.41 is about 11. Do this for 1.4, 2.8, 5.6, 8, 11, 16, 22

Do the same thing with common focal lengths.

24mm x 1.4 = 34 (round to 35).

35mm x 1.4 = ~50mm

50mm x 1.4 = ~70mm (used to be a popular focal length)

What about 28mm?

Well - 28mm x 1.4 = ~40mm... a popular "normal" focal length, particularly earlier on. Actually, if you take the diagonal of 35mm film, it's closer to 40mm than 50mm. The "proper" normal field of view has been the subject of some debate.

This rule doesn't answer all questions about popular focal lengths... but it's good enough for a good conspiracy theory.

[EXIF data available. Click here to show/hide.]

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>>1892171

It's just the weekly thread where retards like to pretend they have some sort of keen insider understanding. Nothing to see here, move along.

It's just the weekly thread where retards like to pretend they have some sort of keen insider understanding. Nothing to see here, move along.

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>>1892174

24mm and 70mm? How many 24mm and 70mm primes have you seen in your life? Damn not only are you talentless but youre fucking retarded.

24mm and 70mm? How many 24mm and 70mm primes have you seen in your life? Damn not only are you talentless but youre fucking retarded.

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>>1892158

What about: >>1892171

I think i've seen 38mm too.

>>1892175

Yeah, the OP question is kinda senseless since there's like all ranges of focal lengths primes.

What about: >>1892171

I think i've seen 38mm too.

>>1892175

Yeah, the OP question is kinda senseless since there's like all ranges of focal lengths primes.

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>>1892179

every manufacturer makes a 24mm prime.

>>1892180

Those are much less common. There's no rule saying that lenses HAVE to be a certain focal length, it's just easier to follow convention.

every manufacturer makes a 24mm prime.

>>1892180

Those are much less common. There's no rule saying that lenses HAVE to be a certain focal length, it's just easier to follow convention.

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>>1892158

this makes sense in a "the government did 9-11" kind of way

>inb4 7 roughly equals 5 (for small values of 7 and big values of 5)

this makes sense in a "the government did 9-11" kind of way

>inb4 7 roughly equals 5 (for small values of 7 and big values of 5)

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Its all about the history and competition for the next big thing. 24mm is just a wider 28mm. I remember when ultra wide was 20mm and then 19mm and now its 14mm or 17mm.

There's no rhyme or reason but capitalism.

There's no rhyme or reason but capitalism.

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>>1892179

24 is one of the most common focal lengths still... and when all this was being sorted out, 7cm lenses were quite common.

Today, the 24-70mm zoom is also common. Perhaps it's not an accident that 70mm was selected for the wide end?

I'll wait patiently for your very public apology.

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24 is one of the most common focal lengths still... and when all this was being sorted out, 7cm lenses were quite common.

Today, the 24-70mm zoom is also common. Perhaps it's not an accident that 70mm was selected for the wide end?

I'll wait patiently for your very public apology.

[EXIF data available. Click here to show/hide.]

Camera-Specific Properties:Camera SoftwareAdobe Photoshop 7.0Image-Specific Properties:Horizontal Resolution92 dpiVertical Resolution92 dpiImage Created2011:09:26 08:47:02

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>>1892200

>24mm is just a wider 28mm

24 is what 28 should have been all along.

>24mm is just a wider 28mm

24 is what 28 should have been all along.

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>>1892202

and why the standard telezoom starts at 70mm. Nikon's (used to?) start at 80mm.

and why the standard telezoom starts at 70mm. Nikon's (used to?) start at 80mm.

>>

In these modern days, numerically, it is largely based upon either historical precedents or arbitrary numbers. Usually the former.

As for the original reason for the calculation of those historical precedental numbers? No idea.

tl;dr this is an irrelevant and pointless discussion in 2013

As for the original reason for the calculation of those historical precedental numbers? No idea.

tl;dr this is an irrelevant and pointless discussion in 2013

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>>1892196

No, it makes sense in the keep-things-simple way.

No, it makes sense in the keep-things-simple way.

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>>1892207

Yeah. Alphon did accidentally say something correct.

Some of the popular focal lengths today did come from small improvements to older designs rather than some master mathematical plan. The 105mm length may trace back to the Ernemann Ernostar 10.5cm f/1.8 was based on some improvements to a standard 10cm design.

Today, there's really no rhyme or reason to it - just some mix historical precedent, marketing, and design constraints.

Attached - crazy Leitz 5cm f/1.5 Summarit

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Yeah. Alphon did accidentally say something correct.

Some of the popular focal lengths today did come from small improvements to older designs rather than some master mathematical plan. The 105mm length may trace back to the Ernemann Ernostar 10.5cm f/1.8 was based on some improvements to a standard 10cm design.

Today, there's really no rhyme or reason to it - just some mix historical precedent, marketing, and design constraints.

Attached - crazy Leitz 5cm f/1.5 Summarit

[EXIF data available. Click here to show/hide.]

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OP's question is kinda interesting, in a not doing anything else at the moment kind of way. So, considering that 8x10 view cameras were the original standard, let's see what those cameras used, and then look at the equivalents as film sizes decreased, thusly:

Approximate equivalents of lens focal length

35mm 4x5 8x10

20mm 65mm 120mm

24mm 75mm 155mm

28mm 90mm 200mm

35mm 115mm 240mm

45mm 150mm 300mm

52mm 180mm 360mm

63mm 210mm 420mm

90mm 300mm 600mm

105mm 360mm 720mm

135mm 480mm 900mm

Interdasting

Approximate equivalents of lens focal length

35mm 4x5 8x10

20mm 65mm 120mm

24mm 75mm 155mm

28mm 90mm 200mm

35mm 115mm 240mm

45mm 150mm 300mm

52mm 180mm 360mm

63mm 210mm 420mm

90mm 300mm 600mm

105mm 360mm 720mm

135mm 480mm 900mm

Interdasting

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>>1892219

Alphon always posts a photo.

Alphon always posts a photo.

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>>1892231

The "normal" lens for a 8x10 is the 360

Also, too, manufacturers and designers label lenses as such and such when they are technically off by as much as 2mm for any given physical lens

The "normal" lens for a 8x10 is the 360

Also, too, manufacturers and designers label lenses as such and such when they are technically off by as much as 2mm for any given physical lens

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>>1892237

Banned for shitposting again.

Banned for shitposting again.