Sigma DP Series Image Thread

[Xuereb]

Dry stream bed.


20130101-_SDI0614 by Xuereb1, on Flickr

Following a 7 day heat wave (37C+ everyday) with the final day hitting 42C, the stream at the bottom of the garden has stopped flowing. For the first 12 years we lived here, it ran throughout the year. Then there were 3 years of drought and this looks like being the 4th. The water level of my neighbour's dam (reeds picture at the top of the previous page) has fallen 18 inches in a week. Some rain is predicted for this week-end; perhaps we may get a trickle in the stream for a while.

[Xuereb]

20130101-_SDI0628 by Xuereb1, on Flickr

An overcast and humid day brought out the big diffuser in the sky, the light was kinder and I was out and about. The big dry brings about strange colour; and the trodden grass where kangaroos have walked is apparent.

[grebeman]

Plenty of flowing water hereabouts. These are from yesterday since we've had low, grey cloud with a hint of drizzle here today. These shots could perhaps have done with one stop smaller aperture (don't know if or when diffraction kicks in with the 30mm lens) to nail the depth of field, I'm running out of focus a bit in the foreground (or focus a bit closer to the foreground, have just hopefully learned how to reposition the focus square). Also whilst I haven't had to apply any sharpening to the large tiffs made for printing, I think that some sharpening (applied in my case in Photo Ninja) is beneficial before downsizing and saving as a jpeg for the web. Hopefully these do justice to the sharpness evident in the raw files.






All with DP2M

Barrie

[grebeman]

As a follow up to the comments I made in post #264 (010113) I have run some tests as to the amount of downsizing to post to the web for DP2M files. I have found that it is not necessary to apply any sharpening to the full size tiffs obtained from SPP and then adjusted in another photo editor, in my case Photo Ninja and then outputted as a print. However when downsized I found the resulting jpeg unrepresentative of the degree of sharpness that can be obtained from a DP2M camera. I found two problems, one being that the tiff file required some sharpening applied to it prior to downsizing and saving as a jpeg. In using my Linix computer to access the web (rather than a windows machine) I have been used to adding a border and downsizing in AfterShot Pro. I found that in resizing using this photo editor there was noticeable loss of quality in the resulting jpeg saved as a file with long side 1024 pixels, also reducing to a file size of approximately 250kb was also excessive, and 600-700kb gives a more representative output file. For the second shot here I did not resize to 1024 pixels, but left it at 1176 pixels as outputted by Photo Ninja, only reducing quality to 90% to produce a smaller file.


As posted in post #264, not sharpened, approx 250kb file size


reworked with sharpening in Photo Ninja and no further downsizing of the Photo Ninja output jpeg, approx 610kb file size (90% quality). This shows no detectable (to my eye) deterioration in quality compared to a 1.7Mb file (100% original)

I think the difference in quality can be easily seen.

Barrie

[grebeman]

DP2M

Barrie

[grebeman]

DP1 with WCON-08B

The Olympus WCON-08B wide angle adapter is left over from my Olympus E-10 days and gives a 22.4mm equivalent in 35mm terms.

Barrie

[Xuereb]

Barrie, I look forward to seeing your DP3M pictures.

[grebeman]

Barrie, I look forward to seeing your DP3M pictures.

Hmm, you might have to settle for the Olympus TCON-14B adapter on a DP2M for a while (equivalent to 63mm on 35mm) It would also be good to see the sun to help do justice to the DP's, that's been conspicuously absent from my life since New Years day. I know it's there above the cloud because we have something called daylight, but many days are what I've started calling 0.25/8/100 days (speed/aperture/iso), so rather dull to say the least.

Barrie

[grebeman]

DP2M


DP2M

Barrie

[pdh]

DP1 with WCON-08B
22.4mm equivalent in 35mm terms.

Barrie

Ah hah!
I looked at this picture but didn't read the text and thought it looked oddly wide for the camera