Finally a decent travel zoom from Fuji

In article , Alfred
Molon wrote:

Just as it's a 16-80mm lens. It's just that it's equivalent to a 24-120/f8
on full frame.

No, the equivalent full frame lens is 24-120/F4 and you
have the benefit of added DoF.

nope. f/8 is correct and depth of field is the same.

In article , Alfred Molon wrote:

In article sandman-adbb4c775ae281f24c021935aa15b6d9
@individual.net, says...

Sandman:
Just as it's a 16-80mm lens. It's just that it's equivalent to a
24-120/f8 on full frame.

No, the equivalent full frame lens is 24-120/F4 and you
have the benefit of added DoF.

That added DoF comes from the mismatch of the equivalent aperture. That's just
like saying that a 16-80mm m43 lens is the same as a 16-80mm full frame lens, you
just get the benefit of a wider angle.

Lot's of places do this - they list the equivalent focal length, but not the
equivalent aperture for reasons unknown. Aperture is equally affected by the crop
sensor.

--
Sandman

In article ,
Sandman wrote:

Just as it's a 16-80mm lens. It's just that it's equivalent to a
24-120/f8 on full frame.

No, the equivalent full frame lens is 24-120/F4 and you
have the benefit of added DoF.

That added DoF comes from the mismatch of the equivalent aperture. That's just
like saying that a 16-80mm m43 lens is the same as a 16-80mm full frame lens,
you just get the benefit of a wider angle.

Lot's of places do this - they list the equivalent focal length, but not the
equivalent aperture for reasons unknown.

the reasons are known, because the exposure doesn't change.

Aperture is equally affected by the crop
sensor.

not equally. only for depth of field.

On 23 Jul 2019 20:32:07 GMT, Sandman wrote:

In article , Alfred Molon wrote:

In article sandman-adbb4c775ae281f24c021935aa15b6d9
@individual.net, says...

Sandman:
Just as it's a 16-80mm lens. It's just that it's equivalent to a
24-120/f8 on full frame.

No, the equivalent full frame lens is 24-120/F4 and you
have the benefit of added DoF.

That added DoF comes from the mismatch of the equivalent aperture. That's just
like saying that a 16-80mm m43 lens is the same as a 16-80mm full frame lens, you
just get the benefit of a wider angle.

Lot's of places do this - they list the equivalent focal length, but not the
equivalent aperture for reasons unknown. Aperture is equally affected by the crop
sensor.

Sure aperture decribed by F number is, by definition, focal-length
divided by lens diameter? The dimensions of the sensor doesn't come
into it.

In article , Eric Stevens wrote:

Sandman:
Just as it's a 16-80mm lens. It's just that it's
equivalent to a 24-120/f8 on full frame.

Alfred Molon:
No, the equivalent full frame lens is 24-120/F4 and you
have the benefit of added DoF.

Sandman:
That added DoF comes from the mismatch of the equivalent aperture.
That's just like saying that a 16-80mm m43 lens is the same as a
16-80mm full frame lens, you just get the benefit of a wider
angle.

Lot's of places do this - they list the equivalent focal length,
but not the equivalent aperture for reasons unknown. Aperture is
equally affected by the crop sensor.

Sure aperture decribed by F number is, by definition, focal-length
divided by lens diameter? The dimensions of the sensor doesn't come
into it.

Just as focal length is, by definition, the lens's ability to converge light.
It's a fixed property of the lens. But with lenses for crop sensors, they often
list the equivalent 35mm focal length, but not the equivalent 35mm aperture.

Both physical factors of the lens are affected when comparing crop to full
format. That's why a f4 m43 lens has the equivalent aperture of a f8 full format
lens. And that's also why you can't get that short focus distance with (most) m43
lenses.



--
Sandman

In article ,
Sandman wrote:

That added DoF comes from the mismatch of the equivalent aperture.
That's just like saying that a 16-80mm m43 lens is the same as a
16-80mm full frame lens, you just get the benefit of a wider
angle.

Lot's of places do this - they list the equivalent focal length,
but not the equivalent aperture for reasons unknown. Aperture is
equally affected by the crop sensor.

Sure aperture decribed by F number is, by definition, focal-length
divided by lens diameter? The dimensions of the sensor doesn't come
into it.

Just as focal length is, by definition, the lens's ability to converge light.
It's a fixed property of the lens. But with lenses for crop sensors, they
often
list the equivalent 35mm focal length, but not the equivalent 35mm aperture.

Both physical factors of the lens are affected when comparing crop to full
format. That's why a f4 m43 lens has the equivalent aperture of a f8 full
format
lens. And that's also why you can't get that short focus distance with (most) m43
lenses.

focus distance is not affected at all.

In article ,
RichA wrote:

Try shooting them, the Nikon 2 stops faster with the same aperture and ISO as the
Fuji and SEE if your equivalency works out. The only thing equivalency theory works
on is angle of view.

no.

In article sandman-
,
says...
Both physical factors of the lens are affected when comparing crop to full
format. That's why a f4 m43 lens has the equivalent aperture of a f8 full format
lens.

Wrong again. An F4 lens is an F4 lens regardless of
sensor size, because the exposure is the same at F4 and
1/100s both on the small sensor camera and the large
sensor camera. But if you shoot at F8, the exposure time
will be 4x the exposure time at F4.

BTW, we are talking about a Fuji lens (1.5x crop).
--
Alfred Molon

Olympus E-series DSLRs and micro 4/3 forum at
https://tech.groups.yahoo.com/group/MyOlympus/
https://myolympus.org/ photo sharing site

In article , Alfred
Molon wrote:

Both physical factors of the lens are affected when comparing crop to full
format. That's why a f4 m43 lens has the equivalent aperture of a f8 full
format lens.

Wrong again. An F4 lens is an F4 lens regardless of
sensor size, because the exposure is the same at F4 and
1/100s both on the small sensor camera and the large
sensor camera. But if you shoot at F8, the exposure time
will be 4x the exposure time at F4.

the exposure is the same, but the results are not, therefore it's *not*
equivalent.

for the same image quality and same depth of field, the equivalent
f/stop is f/8 in this example, with the iso boosted 2 stops to maintain
the proper exposure and the same results.

BTW, we are talking about a Fuji lens (1.5x crop).

doesn't matter.

On 24 Jul 2019 06:25:12 GMT, Sandman wrote:

In article , Eric Stevens wrote:

Sandman:
Just as it's a 16-80mm lens. It's just that it's
equivalent to a 24-120/f8 on full frame.

Alfred Molon:
No, the equivalent full frame lens is 24-120/F4 and you
have the benefit of added DoF.

Sandman:
That added DoF comes from the mismatch of the equivalent aperture.
That's just like saying that a 16-80mm m43 lens is the same as a
16-80mm full frame lens, you just get the benefit of a wider
angle.

Lot's of places do this - they list the equivalent focal length,
but not the equivalent aperture for reasons unknown. Aperture is
equally affected by the crop sensor.

Sure aperture decribed by F number is, by definition, focal-length
divided by lens diameter? The dimensions of the sensor doesn't come
into it.

Just as focal length is, by definition, the lens's ability to converge light.
It's a fixed property of the lens. But with lenses for crop sensors, they often
list the equivalent 35mm focal length, but not the equivalent 35mm aperture.

The 'equivalent 35mm focal length' is intended to guide people who
relate field of view to the focal length of their old 35mm camera
lens.

Both physical factors of the lens are affected when comparing crop to full
format. That's why a f4 m43 lens has the equivalent aperture of a f8 full format
lens. And that's also why you can't get that short focus distance with (most) m43
lenses.

I don't intend to reopen the argument about equivalent apertures so
all I can say is that I believe to be misguided.