Quick doubt: FF comparable Asp-C lenses

arthalion · May 2, 2016

Hello.

I'm confuse with the conversion between FF and ASP-C sensors.

For example, if I wanted to have a FF lens with the same "wide angle" and "zoom" than my current ASP-C 18-200mm.(sel18200LE)

Should I be looking into a FF like the following:

FF 27-300mm.

And the closer FF lens to that would be the 24-240(SEL24240) that would be a 16-160 equivalent ASP-C?. (so wider, but less zoom?).

Thanks in advance.

Regards.

Jaime.

JimKasson · May 2, 2016

arthalion said:
I'm confused about the conversion between lens angle of view for FF and ASP-C sensors.

For example, if I wanted to have a FF lens with the same "wide angle" and "zoom" angle of view as my current ASP-C 18-200mm.(sel18200LE)

Should I be looking into a FF like the following:

FF 27-300mm.

Yes.

arthalion said:
And the closest FF lens to that would be the 24-240(SEL24240) that would have an angle of view of a 16-160 on ASP-C?.

Yes.

In the red quoted material above, I have changed what you wrote to be more grammatical and more clear. Please tell me if I have inadvertently ascribed to you something that you didn't mean.

Jim

--
http://blog.kasson.com

arthalion · May 2, 2016

JimKasson said:
arthalion said:

I'm confused about the conversion between lens angle of view for FF and ASP-C sensors.

For example, if I wanted to have a FF lens with the same "wide angle" and "zoom" angle of view as my current ASP-C 18-200mm.(sel18200LE)

Should I be looking into a FF like the following:

FF 27-300mm.

Click to expand...

Yes.

JimKasson said:

And the closest FF lens to that would be the 24-240(SEL24240) that would have an angle of view of a 16-160 on ASP-C?.

Click to expand...

Yes.

In the red quoted material above, I have changed what you wrote to be more grammatical and more clear. Please tell me if I have inadvertently ascribed to you something that you didn't mean.

Jim

Stazza · May 2, 2016

arthalion said:
And there is any FF lens equivalent to the ASP-C "Rokinon 12mm F2.0"?.
Should be something like Rokinon 18mm FX.X ..

Regards.

Jaime

Zeiss Batis 18mm 2.8 has just been released

JimKasson · May 2, 2016

arthalion said:
JimKasson said:

arthalion said:

I'm confused about the conversion between lens angle of view for FF and ASP-C sensors.

For example, if I wanted to have a FF lens with the same "wide angle" and "zoom" angle of view as my current ASP-C 18-200mm.(sel18200LE)

Should I be looking into a FF like the following:

FF 27-300mm.

Click to expand...

Yes.

arthalion said:

And the closest FF lens to that would be the 24-240(SEL24240) that would have an angle of view of a 16-160 on ASP-C?.

Click to expand...

Yes.

In the red quoted material above, I have changed what you wrote to be more grammatical and more clear. Please tell me if I have inadvertently ascribed to you something that you didn't mean.

Click to expand...

That's exactly what i Meant.

Thanks very much.

And there is any FF lens equivalent to the ASP-C "Rokinon 12mm F2.0"?.

Should be something like Rokinon 18mm FX.X ..

X.X = 2.8. FF equivalent aperture is one stop narrower than APS-C.

Jim

arthalion · May 2, 2016

JimKasson said:
arthalion said:

JimKasson said:

arthalion said:

I'm confused about the conversion between lens angle of view for FF and ASP-C sensors.

For example, if I wanted to have a FF lens with the same "wide angle" and "zoom" angle of view as my current ASP-C 18-200mm.(sel18200LE)

Should I be looking into a FF like the following:

FF 27-300mm.

Click to expand...

Yes.

JimKasson said:

And the closest FF lens to that would be the 24-240(SEL24240) that would have an angle of view of a 16-160 on ASP-C?.

Click to expand...

Yes.

In the red quoted material above, I have changed what you wrote to be more grammatical and more clear. Please tell me if I have inadvertently ascribed to you something that you didn't mean.

Click to expand...

That's exactly what i Meant.

Thanks very much.

And there is any FF lens equivalent to the ASP-C "Rokinon 12mm F2.0"?.

Should be something like Rokinon 18mm FX.X ..

Click to expand...

X.X = 2.8. FF equivalent aperture is one stop narrower than APS-C.

Jim

--
http://blog.kasson.com

Thanks Jim.

That's complicated. so the Aperture is multiplied by 1,4?.

For example talking about the ASP-C SEL18-200LE 3,5-5,6 Aperture FF equivalence would be around 4,9-7,4?

So I could assume that SEL24240(3,5-6,3) is a faster lens than SEL18200LE?.

Regards.

Jaime.

arthalion · May 2, 2016

Stazza said:
Stazza said:

And there is any FF lens equivalent to the ASP-C "Rokinon 12mm F2.0"?.

Should be something like Rokinon 18mm FX.X ..

Regards.

Jaime

Click to expand...

Zeiss Batis 18mm 2.8 has just been released

Thanks.

There is something else not so expensive? around 600USD.

Regards.

Jaime.

JimKasson · May 2, 2016

arthalion said:
JimKasson said:

arthalion said:

JimKasson said:

arthalion said:

I'm confused about the conversion between lens angle of view for FF and ASP-C sensors.

For example, if I wanted to have a FF lens with the same "wide angle" and "zoom" angle of view as my current ASP-C 18-200mm.(sel18200LE)

Should I be looking into a FF like the following:

FF 27-300mm.

Click to expand...

Yes.

arthalion said:

And the closest FF lens to that would be the 24-240(SEL24240) that would have an angle of view of a 16-160 on ASP-C?.

Click to expand...

Yes.

In the red quoted material above, I have changed what you wrote to be more grammatical and more clear. Please tell me if I have inadvertently ascribed to you something that you didn't mean.

Click to expand...

That's exactly what i Meant.

Thanks very much.

And there is any FF lens equivalent to the ASP-C "Rokinon 12mm F2.0"?.

Should be something like Rokinon 18mm FX.X ..

Click to expand...

X.X = 2.8. FF equivalent aperture is one stop narrower than APS-C.

Click to expand...

That's complicated. so the Aperture is multiplied by 1,4?.

1.5, actually, which is about a stop.

arthalion said:
For example talking about the ASP-C SEL18-200LE 3,5-5,6 Aperture FF equivalence would be around 4,9-7,4?

Yes.

arthalion said:
So I could assume that SEL24240(3,5-6,3) is a faster lens than SEL18200LE?.

Welcome to the confusing and controversial world of equivalence. The changing of the f-stop yields the same depth of field (DOF), and the same number of photons sticking the landing on the sensor.

Jim

--
http://blog.kasson.com

dbm305 · May 2, 2016

arthalion said:
JimKasson said:

arthalion said:

I'm confused about the conversion between lens angle of view for FF and ASP-C sensors.

For example, if I wanted to have a FF lens with the same "wide angle" and "zoom" angle of view as my current ASP-C 18-200mm.(sel18200LE)

Should I be looking into a FF like the following:

FF 27-300mm.

Click to expand...

Yes.

arthalion said:

And the closest FF lens to that would be the 24-240(SEL24240) that would have an angle of view of a 16-160 on ASP-C?.

Click to expand...

Yes.

In the red quoted material above, I have changed what you wrote to be more grammatical and more clear. Please tell me if I have inadvertently ascribed to you something that you didn't mean.

Jim

Click to expand...

SQLGuy · May 2, 2016

arthalion said:
Stazza said:

arthalion said:

And there is any FF lens equivalent to the ASP-C "Rokinon 12mm F2.0"?.

Should be something like Rokinon 18mm FX.X ..

Regards.

Jaime

Click to expand...

Zeiss Batis 18mm 2.8 has just been released

Click to expand...

Thanks.

There is something else not so expensive? around 600USD.

Regards.

Jaime.

With adapters, there are several 17 to 20mm full frame primes, like the Canon FD or EF 17/4 (a bit slower than you want, though), or the Nikon 18mm F2.8 (used, about $550).

On the wider side, there's the Rokinon 14/2.8.

balazer2 · May 2, 2016

If you have a lens and you want to know the f-number of a different lens in a different focal length that has the same aperture size, you scale the f-number by the ratio of the focal lengths. For APS-C to full-frame, that's 1.5~1.6, depending on the exact sensor measurements. It's not 1.4 or the square root of 2.

For example, if you have a 28 mm f/2.8 lens and you want to know the f-number of a 42 mm lens with the same aperture size, you multiply 2.8 by 42/28. That's 4.2. A 28 mm f/2.8 lens and a 42 mm f/4.2 lens have the same aperture diameter: 10 mm. In fact that calculation works for any two focal lengths in any ratio, independent of the cameras they're attached to.

If you want to talk about angle of view or the depth of the focus field for cameras in different formats, then you also need to account for the sensors.

For example, a full-frame camera has a sensor diagonal of 43.27 mm. An APS-C camera might have a sensor diagonal of 28.84 mm. (1.5 crop factor) If you used a 28 mm lens on the APS-C camera, a 42 mm lens on the full frame camera would give you the same diagonal angle of view, assuming the image circles of both lenses fully cover the sensors of the respective cameras. If the two cameras have the same pixel count and the two lenses are focused at the same distance, f/2.8 on the 28 mm lens would give the same depth of field as f/4.2 on the 42 mm lens.

arthalion · May 3, 2016

balazer2 said:
If you have a lens and you want to know the f-number of a different lens in a different focal length that has the same aperture size, you scale the f-number by the ratio of the focal lengths. For APS-C to full-frame, that's 1.5~1.6, depending on the exact sensor measurements. It's not 1.4 or the square root of 2.

For example, if you have a 28 mm f/2.8 lens and you want to know the f-number of a 42 mm lens with the same aperture size, you multiply 2.8 by 42/28. That's 4.2. A 28 mm f/2.8 lens and a 42 mm f/4.2 lens have the same aperture diameter: 10 mm. In fact that calculation works for any two focal lengths in any ratio, independent of the cameras they're attached to.

If you want to talk about angle of view or the depth of the focus field for cameras in different formats, then you also need to account for the sensors.

For example, a full-frame camera has a sensor diagonal of 43.27 mm. An APS-C camera might have a sensor diagonal of 28.84 mm. (1.5 crop factor) If you used a 28 mm lens on the APS-C camera, a 42 mm lens on the full frame camera would give you the same diagonal angle of view, assuming the image circles of both lenses fully cover the sensors of the respective cameras. If the two cameras have the same pixel count and the two lenses are focused at the same distance, f/2.8 on the 28 mm lens would give the same depth of field as f/4.2 on the 42 mm lens.

Thanks Balazer, for the great explication.

so the ASP-C equivalence of the FF sony lense would be the following?.

73ec0c108e914071be7aa0f9178fdfb8.jpg.png

Regards.

Jaime.

balazer2 · May 3, 2016

For the full-frame lenses you've listed, yes, those are what the equivalent lenses would be in APS-C.

arthalion · May 3, 2016

balazer2 said:
For the full-frame lenses you've listed, yes, those are what the equivalent lenses would be in APS-C.

Thanks Balazer.

Last question.

If today I have the SEL16F28(16mm F2.8mm) and i wanted to have something with the same "angle of view" for my future full frame.

The SEL28F20 could be a Lense with the same "angle of view" but much "faster" F1.2 vs F2.8?.

Regards.

Jaime.

JohnNEX · May 4, 2016

JimKasson said:
Welcome to the confusing and controversial world of equivalence.

If you want to really annoy a lot of people then just make a post to every forum here asking, "can someone explain equivalence?"

Great fun for all ...

balazer2 · May 4, 2016

arthalion said:
If today I have the SEL16F28(16mm F2.8mm) and i wanted to have something with the same "angle of view" for my future full frame.

The SEL28F20 could be a Lense with the same "angle of view" but much "faster" F1.2 vs F2.8?.

Regards.

Jaime.

An APS-C 16 mm f/2.8 lens is equivalent to a full-frame 24 mm f/4.2 lens.

A full-frame 28 mm lens would not be quite as wide.

arthalion · May 4, 2016

balazer2 said:
arthalion said:

If today I have the SEL16F28(16mm F2.8mm) and i wanted to have something with the same "angle of view" for my future full frame.

The SEL28F20 could be a Lense with the same "angle of view" but much "faster" F1.2 vs F2.8?.

Regards.

Jaime.

Click to expand...

An APS-C 16 mm f/2.8 lens is equivalent to a full-frame 24 mm f/4.2 lens.

A full-frame 28 mm lens would not be quite as wide.

Thanks Blazer.

- So I assume i had a mistake in my previous Table. For FL equivalence and F equivalence should I use (43.27/28,84) = 1.5.

- So now, If i wanted to have a FF lens with the same "wide angle of view" to SEL16F28 ASP-C. Would be the SEL2470Z. But in the lower FL this lense is "faster" than SEL16F28. 2.7 vs 2.8 (ASP-c F).

now i got it?

e368769beafe46e88089b5a8e457b55a.jpg.png

Thanks for your patience.

Regards.

Jaime.

Tristimulus · May 4, 2016

balazer2 said:
arthalion said:

If today I have the SEL16F28(16mm F2.8mm) and i wanted to have something with the same "angle of view" for my future full frame.

The SEL28F20 could be a Lense with the same "angle of view" but much "faster" F1.2 vs F2.8?.

Regards.

Jaime.

Click to expand...

An APS-C 16 mm f/2.8 lens is equivalent to a full-frame 24 mm f/4.2 lens.

A full-frame 28 mm lens would not be quite as wide.

The lenses are not equivalent, but the field of view is.

SQLGuy · May 4, 2016

But you need to relabel your columns. It's APS-C, not ASP-C.

arthalion · May 4, 2016

SQLGuy said:
But you need to relabel your columns. It's APS-C, not ASP-C.

Quick doubt: FF comparable Asp-C lenses

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