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Thread started 03 Jan 2012 (Tuesday) 12:39
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55-250 IS weird problem

 
huangyu84
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Jan 03, 2012 12:39 |  #1

Hello all and happy New Year,

My problem is that the IQ delivered by 55-250 IS is not consistent. Keep long story short, I tried to use 55-250 is to image Orion nebula. I got very bad distortion away from center at around 200mm@f8 in the first night. I thought I might continue to collect data next day, so I tape the lens to keep the focal length unchanged. Weird thing happened in the second night, the image quality improved a lot. Most of the distortions were gong even at wide open. The third night, I reduced the focal length a bit, and the distortions were back there. All the conditions were same for the two shots except the temperature as far as I can recall.

Single 2min shot from 1st night

IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/png'


Single 2min shot from other night
IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/png'


I already ruled out the focusing problem, tracking error by a series of tests afterwards and I could never reproduce the image quality as in the second night.

BTW, Many people refers the 55-250 is has the same image quality as 70-300 IS USM. In this case, I don't think so. the 70-300 IS USM performs much better. Whenever I use it to shoot stars, the image quality is quite consistent (and noticeable better edge performance).



  
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Virto
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Jan 03, 2012 12:42 |  #2

Might want to toss this in the astrophotography section, they might have some better ideas if it's lens related or some kind of potential issue with the way you're doing things.

Everything seems to have more of a trail to it in the 1st shot, not just in the corner. Are you sure they were both 2 min exposures?


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Veemac
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Jan 03, 2012 12:45 as a reply to  @ Virto's post |  #3

Your first picture shows an exposure time of 120 seconds (2 minutes) - what you're seeing are star trails. The EXIF on the second photo shows an exposure time of 30 seconds, so it makes sense that you'd get much less trailing in that image.


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Attomsk
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Jan 03, 2012 12:53 |  #4

Veemac wrote in post #13639887 (external link)
Your first picture shows an exposure time of 120 seconds (2 minutes) - what you're seeing are star trails. The EXIF on the second photo shows an exposure time of 30 seconds, so it makes sense that you'd get much less trailing in that image.

This sounds right to me - unless the OP is using a tool to move the camera with the earth's rotation.


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Austin.Manny
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Jan 03, 2012 12:54 |  #5

Veemac wrote in post #13639887 (external link)
Your first picture shows an exposure time of 120 seconds (2 minutes) - what you're seeing are star trails. The EXIF on the second photo shows an exposure time of 30 seconds, so it makes sense that you'd get much less trailing in that image.

Exactly. Believe it or not, the night sky isn't static; it moves a lot faster than you think. The first picture had an exposure of two minutes, which captured a lot more movement than the 30 seconds of the second picture.


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huangyu84
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Jan 03, 2012 13:00 |  #6

Veemac wrote in post #13639887 (external link)
Your first picture shows an exposure time of 120 seconds (2 minutes) - what you're seeing are star trails. The EXIF on the second photo shows an exposure time of 30 seconds, so it makes sense that you'd get much less trailing in that image.

Thanks for your input,
I'm pretty sure it was not star trail. The camera was ridding on an Orion sirius EQ mount which is an overkill for this focal length. I also have 30 sec sub in the first night which showed the exactly same distortion.

here's the 10 sec exposure from 1st night (f5.6), same distortion.

IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/png'



  
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DreDaze
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Jan 03, 2012 13:03 |  #7

maybe you're tracker isn't doing a good job...it definitely looks like it's related to the shutter speed

can't see the exif on your last shot, but considering you were wrong about the shutter on your second i wonder if you're right on the last one being 10 sec...

post up the 30sec shot the first night that shows the same distortion


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huangyu84
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Jan 03, 2012 13:05 |  #8

and 30 sec exposure (f8) from 1st night: (upper left corner)

IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/png'



  
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Veemac
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Jan 03, 2012 13:30 |  #9

huangyu84 wrote in post #13639952 (external link)
Thanks for your input,
I'm pretty sure it was not star trail. The camera was ridding on an Orion sirius EQ mount which is an overkill for this focal length. I also have 30 sec sub in the first night which showed the exactly same distortion...

Most definitely star trails, IMO. They're all in the exact same direction with identical lengths. Either your tracker isn't tracking at all, or you don't have it properly aligned.


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huangyu84
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Jan 03, 2012 13:35 |  #10

DreDaze wrote in post #13639971 (external link)
maybe you're tracker isn't doing a good job...it definitely looks like it's related to the shutter speed

can't see the exif on your last shot, but considering you were wrong about the shutter on your second i wonder if you're right on the last one being 10 sec...

post up the 30sec shot the first night that shows the same distortion

Tracking may have small contributions to the distortion, but I believe the most part of distortions was from the lens itself. I uploaded three full size shots with exif information for you guys to compare.

55-250 IS 120s f8 1st night
http://imageshack.us …76/55250isf81st​night.jpg/ (external link)

55-250 IS 120s f5.6 2nd night
http://imageshack.us …1/55250isf562nd​night.jpg/ (external link)

70-300 IS USM f8 3rd night
http://imageshack.us …mages/545/70300​isusm.jpg/ (external link)




  
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DreDaze
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Jan 03, 2012 13:38 |  #11

maybe your tracker wasn't on the first night...


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huangyu84
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Jan 03, 2012 13:40 |  #12

Veemac wrote in post #13640111 (external link)
Most definitely star trails, IMO. They're all in the exact same direction with identical lengths. Either your tracker isn't tracking at all, or you don't have it properly aligned.

Veemac,

They are not in the same direction. The image only shows upper left corner. But if you zoom in lower left coner, they are in different direction. And the center of the frame shows almost no trails at all. I'm confused...




  
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HyperYagami
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Jan 03, 2012 13:41 as a reply to  @ DreDaze's post |  #13

agreed with most comments. that doesn't look "distortion", more like trail of some sort due to movement. IS on or off?



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Veemac
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Jan 03, 2012 13:45 as a reply to  @ HyperYagami's post |  #14

As Virto said earlier, I'd post this over in the Astrophotography section. There are a lot of very knowledgeable and experienced folks there who should be able to help you out.


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RTPVid
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Jan 03, 2012 21:45 |  #15

huangyu84 wrote in post #13639858 (external link)
Hello all and happy New Year,

My problem is that the IQ delivered by 55-250 IS is not consistent. Keep long story short, I tried to use 55-250 is to image Orion nebula. I got very bad distortion away from center at around 200mm@f8 in the first night. I thought I might continue to collect data next day, so I tape the lens to keep the focal length unchanged. Weird thing happened in the second night, the image quality improved a lot. Most of the distortions were gong even at wide open. The third night, I reduced the focal length a bit, and the distortions were back there. All the conditions were same for the two shots except the temperature as far as I can recall.

Single 2min shot from 1st night
IMAGE NOT FOUND
HTTP response: NOT FOUND | MIME changed to 'image/png'


Single 2min shot from other night
IMAGE NOT FOUND
HTTP response: NOT FOUND | MIME changed to 'image/png'


I already ruled out the focusing problem, tracking error by a series of tests afterwards and I could never reproduce the image quality as in the second night.

BTW, Many people refers the 55-250 is has the same image quality as 70-300 IS USM. In this case, I don't think so. the 70-300 IS USM performs much better. Whenever I use it to shoot stars, the image quality is quite consistent (and noticeable better edge performance).

As others have said, the first exposure is 120 sec and the second is 30 sec, not the 120 sec you write (assuming your EXIF data is correct). The difference is star trails caused by the longer exposure, not the lens itself, it seems to me.

The advice about taking this to the astrophotography forum is sound.


Tom

  
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