G*Y
2 楼
From D800 Technical Guide:
Lesson 3: Don’t Stop Aperture Down Too Far
... Stop aperture down too far, however, and diffraction will cause the
image to actually lose definition. Optimal aperture—the aperture that
produces the greatest depth of fi eld with no loss of sharpness—varies from
lens to lens. In the case of the AF-S NIKKOR 14–24 mm f/2.8G ED lens used
in this example, an aperture f/8
will produce the sharpest image....
Lesson 3: Don’t Stop Aperture Down Too Far
... Stop aperture down too far, however, and diffraction will cause the
image to actually lose definition. Optimal aperture—the aperture that
produces the greatest depth of fi eld with no loss of sharpness—varies from
lens to lens. In the case of the AF-S NIKKOR 14–24 mm f/2.8G ED lens used
in this example, an aperture f/8
will produce the sharpest image....
G*r
3 楼
date: Mon, Jan 8, 2018 at 4:21 PM
subject: SRCxxxxxxxxxxx
mailed-by: uscis.dhs.gov
signed-by: uscis.dhs.gov
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: Important according to our magic sauce.
The Texas Service Center has approved the following I-140 Immigrant Petition
for Alien Worker that had been filed under the Premium Processing Service:
Receipt Number: SRCxxxxx
Date Received: 05/2011
Petitioner: xx
Priority Date:
DOB:
Classification sought: NCP
The form I-797 Approval Notice will follow in the mail.
Please note that this e-mail message is being sent as a courtesy and cannot
be used as evidence of nonimmigrant status. Nor can this message be used as
evidence to procure an immigrant visa.
subject: SRCxxxxxxxxxxx
mailed-by: uscis.dhs.gov
signed-by: uscis.dhs.gov
security: Standard encryption (TLS) Learn more
: Important according to our magic sauce.
The Texas Service Center has approved the following I-140 Immigrant Petition
for Alien Worker that had been filed under the Premium Processing Service:
Receipt Number: SRCxxxxx
Date Received: 05/2011
Petitioner: xx
Priority Date:
DOB:
Classification sought: NCP
The form I-797 Approval Notice will follow in the mail.
Please note that this e-mail message is being sent as a courtesy and cannot
be used as evidence of nonimmigrant status. Nor can this message be used as
evidence to procure an immigrant visa.
G*Y
4 楼
这里还有一段：
Stopping aperture down increases depth of fi eld, making the
foreground and background sharper. Stop aperture down
too far, however, and diff raction will actually cause the image
to lose defi nition. The eff ects of diff raction are partly infl uenced
by the size of the pixels in the camera image sensor,
but with the D800/D800E’s high resolution the eff ects generally
become noticeable around f/11. When you need more
depth of fi eld, don’t just immediately stop the lens all the way
down; instead, look for the aperture that off ers the best balance
between sharpness and depth of fi eld. In the examples
on this page, you can see the grid lose defi nition as aperture
is stopped down past f/11.
from
used
【在 G**Y 的大作中提到】
: From D800 Technical Guide:
: Lesson 3: Don’t Stop Aperture Down Too Far
: ... Stop aperture down too far, however, and diffraction will cause the
: image to actually lose definition. Optimal aperture—the aperture that
: produces the greatest depth of fi eld with no loss of sharpness—varies from
: lens to lens. In the case of the AF-S NIKKOR 14–24 mm f/2.8G ED lens used
: in this example, an aperture f/8
: will produce the sharpest image....
Stopping aperture down increases depth of fi eld, making the
foreground and background sharper. Stop aperture down
too far, however, and diff raction will actually cause the image
to lose defi nition. The eff ects of diff raction are partly infl uenced
by the size of the pixels in the camera image sensor,
but with the D800/D800E’s high resolution the eff ects generally
become noticeable around f/11. When you need more
depth of fi eld, don’t just immediately stop the lens all the way
down; instead, look for the aperture that off ers the best balance
between sharpness and depth of fi eld. In the examples
on this page, you can see the grid lose defi nition as aperture
is stopped down past f/11.
from
used
【在 G**Y 的大作中提到】
: From D800 Technical Guide:
: Lesson 3: Don’t Stop Aperture Down Too Far
: ... Stop aperture down too far, however, and diffraction will cause the
: image to actually lose definition. Optimal aperture—the aperture that
: produces the greatest depth of fi eld with no loss of sharpness—varies from
: lens to lens. In the case of the AF-S NIKKOR 14–24 mm f/2.8G ED lens used
: in this example, an aperture f/8
: will produce the sharpest image....
g*z
5 楼
D7k打到f14能明显看出衍射失真
G*Y
6 楼
看来，未来就是F/8-11的了。广角够了，长焦和微距怎么办呢？
【在 g******z 的大作中提到】
: D7k打到f14能明显看出衍射失真
【在 g******z 的大作中提到】
: D7k打到f14能明显看出衍射失真
d*h
7 楼
拍若干张用软件合成，现在这样的软件已经用在微距上了。
本来用残副18M pixels拍微距f8以上就已经有diffraction了，还没有用到D800呢——
用T3i+60mm macro有感。。
【在 G**Y 的大作中提到】
: 看来，未来就是F/8-11的了。广角够了，长焦和微距怎么办呢？
本来用残副18M pixels拍微距f8以上就已经有diffraction了，还没有用到D800呢——
用T3i+60mm macro有感。。
【在 G**Y 的大作中提到】
: 看来，未来就是F/8-11的了。广角够了，长焦和微距怎么办呢？
C*y
8 楼
缩图
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