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Please evaluate hardware thru these photos
Posted By: paugie, 10-19-2008, 01:34 PM

Hello,
I bought a used K100D and a new Sigma 24-60/2.8. These are some pix taken with the combo. They are straight from the cam with no post processing at all. I hope you will give me your technical evaluation of the equipment. If you can see any problem, I can still have them corrected via warranty. Thank you for your time.


24mm;F11;1/250
Sigma 24-60/2.8 EX DG
K100D "Landscape Mode"


24mm; F11; 1/180
Sigma 24-60/2.8 EX DG
K100D "Normal Mode"
Flash On in "Auto Mode"
On this one, there seems to be a small circular blemish at the upper left corner, visible against the sky.


24mm; F3.5; 1/45
Sigma 24-60/2.8 EX DG
K100D "Normal Mode"
Flash On in "Auto Mode"
AFAIK taken inside a mall in Forest Park

They were taken by my sister who still has the camera in Canada.
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10-19-2008, 01:58 PM   #2
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You haven't posted the best shots really for evaluation. What you have posted seems pretty normal, focus seems ok (the third shot is the best example). See if your sister can shoot a couple of close up shots and some wider shots with better lighting conditions.
10-19-2008, 06:14 PM   #3
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QuoteQuote:
On this one, there seems to be a small circular blemish at the upper left corner, visible against the sky.
That is dust. Welcome to digital cameras...

The images look OK, "hardware" wise.
10-19-2008, 06:26 PM   #4
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ok, I'll ask her to take photos wide open, close ups and at wider focal lengths?

I may have some photos she has sent me which fill those requirements.

Is there anything out of the normal in the flared photo?

So one does not usually see purple firinging or CA at F11, huh?

10-19-2008, 07:12 PM   #5
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QuoteOriginally posted by paugie Quote
Is there anything out of the normal in the flared photo?
Nope, shooting into the sun will do that.

QuoteQuote:
So one does not usually see purple firinging or CA at F11, huh?
PF and CA isn't necessarily a function of the aperture, it's usually caused by very high contrast edges in a picture, though some lenses are more prone to it than others. Usually when an edge is backlit by the sky or a bright light source.
10-19-2008, 08:05 PM   #6
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QuoteOriginally posted by alohadave Quote
Nope, shooting into the sun will do that.
Uh, ok, so that's not so bad, then.
PF and CA isn't necessarily a function of the aperture, it's usually caused by very high contrast edges in a picture, though some lenses are more prone to it than others. Usually when an edge is backlit by the sky or a bright light source.
Is it possible to evaluate CA and purple fringing in the Sprinkler photo?

Now here are the 2 landscapes where the blemishes are worse. Now it's not just a dot but 2 more smudges. these are from the Tokina 19-35/F3.5-4.5, both taken at 1/250/F11 in Landscape Mode. Now I notice the two lenses render color differently.



what can be done about the smudges? there's another one just off the middle in the top part. It's against the sky so it can still be seen.
10-19-2008, 08:08 PM   #7
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oops, so excited, I forgot to say thank you for the comments.

Really appreciate your going out of your way to comment on these photos. Much learning here for me.
10-19-2008, 08:46 PM   #8
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Definitely dust on the sensor. A "Rocket Blower" will take care of all but the most stubborn ('welded' on) dust. BTW, the dust will be a lot more visible at F11 than it would be at say, F4 or so.

I have the Sigma 24-60 and it is a fantastic lens. I agree that these photos may not show what this lens is capable of. It's really good wide open at 2.8. Example:



10-20-2008, 12:45 AM   #9
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you have a lot of dust on your sensor, rockeblower will take care of it...
10-20-2008, 05:42 AM   #10
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QuoteOriginally posted by paugie Quote
Is it possible to evaluate CA and purple fringing in the Sprinkler photo?
Honestly, I see very little CA or PF in that shot. Maybe some around the trees in the upper right, above the roof line, but it looks well controlled.
10-20-2008, 05:41 PM   #11
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thanks for all the replies. will look around for this RocketBlower.
hopefully it won't blow away any other parts inside the camera.
10-20-2008, 05:59 PM   #12
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Well, that second image (girl in parking lot) really could have done with some fill-in flash. It says below the image Flash On in "Auto Mode" - shouldn't it be programmed to fire here?
Excuse me if my advice voice is talking out of my proverbial posterior. I'm tired.

Go to bed...
10-20-2008, 06:07 PM   #13
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Here are blowers. A bigger one is better as it moves more air per squeeze. Some have a filter in the tip. Do not use canned air as that will be too strong for the internal parts of your camera.

Amazon.com: rocket blower - Accessories / Camera & Photo: Camera & Photo
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