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Messages - wearle

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1
Landscape / Re: Stars above.
« on: February 08, 2014, 09:10:31 PM »
To all,

Here's my first and second attempt at star trails.  In my first attempt, I made the mistake of too short of an exposure.  It would generally be somewhat light polluted near Battle Mountain, but fog and low cloud had enveloped the lower terrain blocking out all the light pollution coming from the Columbia Basin.  My exposures should have been two minutes, but they were only 20 seconds.  :(  On my second attempt, I raised my exposure to one minute since it was the longest I could go without blowing out the illuminated fog below over Pendleton, Oregon.  I believe it's a better attempt than the first, but still room for improvement.  A couple of vehicles went by and down Emigrant Hill during a couple of the exposures.  I'm not quite sure if the illuminated foreground hurts or helps the image.  What are your thoughts?

Thanks for looking,

Wade

2
Lenses / Re: Canon TS-E 24mm f/3.5L II Request for Samples
« on: February 08, 2014, 02:25:30 AM »
To all,

Thanks for your help.  The lens is going back to Canon since it continues to perform well below par.

Wade

3
Landscape / Re: Deep Sky Astrophotography
« on: February 04, 2014, 10:05:08 PM »
To all,

Here's a wide-field image of the dark nebula in Aquila.  This is a three frame mosaic.  It was taken with a modified Canon 5D2 and a Canon 200mm f/2.0L stopped down to f/4.0.  Each frame is an integration of 10 four-minute exposures.  Each frame was calibrated using six dark frames, twenty biases, and twenty flats.  All calibration and processing was done in PixInsight.

I may try to add a few frames to the right side of the mosaic this year as it is just too dark.  That's what happens when you grab a portion of the Great Rift.  :)

Thanks for looking,

Wade

4
Lenses / Re: Canon TS-E 24mm f/3.5L II Request for Samples
« on: February 04, 2014, 09:51:56 PM »
Is very possible that you have a lemon. I went through quite a few before I got one that's better. Mine is actually slightly sharper in the corners than center...and equals the sharpness of my 17-40 and 24-105 in the center and obviously is much better in the corners, even when shifted. Very little if any distortion and very slight chroma in corners but often not noticeable...Its a difficult lens to fix as the technicians often don't have much experience or the latest software...where I live mine was the first one they ever worked on and they didn't even have the latest software...so I would make sure that I send it to a repair center that can handle such a complicated lens. Other send it back and ask for another one . Keep your original test images to compare...

Ivan,

I really appreciate the information about your lens.  This is very helpful.  It seems Canon has poor quality control with this lens.  The first lens I sent back because it was really bad.  The second one I was unfortunately convinced by Canon repairs they could fix it.  They have improved the quality of the images it produces, but it is still inferior to my Canon 24mm f/1.4L which is really sad.  I should have purchased the one I rented.  It was a really good copy.  Hindsight is 20-20.  :(

Would you be willing to share some examples?

Wade

5
Lenses / Canon TS-E 24mm f/3.5L II Request for Samples
« on: February 04, 2014, 02:09:53 AM »
To all,

I'm still trying to figure out if I got a lemon.  I have received it back from Canon repair, and they replaced the G3 assembly.  It is much better than what it was but my Canon 24mm f/1.4L outperforms it from f/2.2 onward.  I would consider my Canon 24mm f/1.4L lens to be average.  Since I only have one other sample (a rental) of what the TS-E 24mm f/3.5L II lens can do, I really have know idea what to expect of this lens.  The rental was awesome.  It was sharp throughout the field of view. 

Would it be possible for the owners of this lens to send me high resolution images of a landscape or cityscape showing what this lens can do under the following conditions:

  • Focused at infinity
  • Shift and tilt set to zero position
  • Camera level to ground (i.e. no tilt)
  • One image taken at f/4.0
  • Final image taken at f/8.0

You can send me E-mail privately or a link on this thread. Basically, all my images taken with this lens are somewhat soft near the center edges and progressively get worse in the corners.  At this time, I would estimate the "sharp" area of coverage to be a 30mm circle around the center. 

You can either post JPEG images of 100 percent crops of the center sides or privately E-mail me a high resolution JPEG full image.   Please no masterpieces, just test shots that aren't worth a dime.  :)

Any help would be greatly appreciated.

Thanks,

Wade

6
Landscape / Re: Sunset landscape
« on: February 01, 2014, 06:13:25 PM »

Cape Fear river NC

Excellent capture and lovely colors.

Wade

7
Landscape / Re: Sunset landscape
« on: February 01, 2014, 06:11:21 PM »

8
Landscape / Re: Deep Sky Astrophotography
« on: February 01, 2014, 06:09:44 PM »

Without a doubt, that's the best meteor picture I've ever seen. Well done!

It takes a lot of work to produce these composites so I really appreciate your comment.

Wade

9
Landscape / Re: Deep Sky Astrophotography
« on: February 01, 2014, 06:07:46 PM »

Yeah, I read a bit about the f/3 issue on Astrodon's site. I am actually planning to use my 600mm f/4 lens as a fast APO refractor. Probably with an SBIG STF-8300m in the long run, with the filter ring accessory. Is f/4 fast enough to cause problems?

You should be okay.  You might loose a little transmission efficiency, but probably not enough to notice.

Wade

10
Landscape / Re: Deep Sky Astrophotography
« on: January 30, 2014, 01:50:25 AM »

Hmm, interesting about the N2 band. And 5nm filters are about $300 cheaper than 3nm filters are (~$600 vs. $900), so a decent savings in money.

I would recommend getting the H-alpha in 5nm, S2 in 3nm, and O3 in 3nm.  The only drawback to 3nm is if you have a fast system (i.e. f/3 or faster).  They become less efficient and your almost better off getting all 5nm.

Wade

11
Landscape / Re: Deep Sky Astrophotography
« on: January 29, 2014, 09:49:12 PM »

This is a composite image of the 2012 Perseid Meteor shower taken with a Canon 1DX and a rented Canon 8-15mm f/4.0L lens.

Oops, that should be the 2013 Perseid Meteor Shower.  :-[

Wade

12
Landscape / Re: Deep Sky Astrophotography
« on: January 29, 2014, 09:40:03 PM »
To all,

This is not quite deep-sky, but might be "landscape".  :)

This is a composite image of the 2012 Perseid Meteor shower taken with a Canon 1DX and a rented Canon 8-15mm f/4.0L lens.  The underlying background is a single image.  I captured meteors throughout the night and picked the brightest ones to copy onto the background image.  LightRoom and Photoshop CC were used to make the composite.

Thanks for looking,

Wade

13
Landscape / Re: Deep Sky Astrophotography
« on: January 29, 2014, 09:32:34 PM »
To all,

Here's a wide-field image of the Rosette and Cone Nebula region.  This was taken with a modified Canon 5D2 and a Canon 200mm f/2.0L stopped down to f/4.0.  It is an integration of 16 four-minute exposures.  It was calibrated using six dark frames, twenty biases, and twenty flats.  All calibration and processing was done in PixInsight.

Thanks for looking,

Wade

14
Landscape / Re: Deep Sky Astrophotography
« on: January 29, 2014, 09:29:47 PM »

Have you ever thought of narrow band imaging? Especially with the 3nm filters we have these days, you can even image DURING the full moon, and still get high SNR results that produce beautiful grayscale results (H-a only) or mapped images (S-II, H-a & O-III). I live under moderately light polluted skies. I was originally thinking about using an LPR, but I think now that I'm going to go all in for 3nm narrow band filters (although they are rather expensive...about $500-$700 each) so I can do more imaging from my home.

Not much you can do about cloud cover, but since you can image during the entire lunar cycle, you get a lot more cuddle time with your scope. ;)

I do image in H-alpha, but only with my CCD camera. 

I have a 5nm H-alpha filter.  Keep in mind, the 3nm H-alpha filter blocks out the N2 spectrum so your results will look a little different than most narrowband H-alpha filters which are wide enough to capture N2.

You still lose contrast when imaging during "moon-up" even with narrowband filters.  The effect just isn't as pronounced.  Because of this, I generally do not image while the Moon is up. 

It takes me about 90 minutes driving time to get to my dark site so I'm probably too picky when it comes to transparency.   I could probably double my trips if I wasn't so picky.  :(

Wade

15
Landscape / Re: Deep Sky Astrophotography
« on: January 28, 2014, 11:28:39 PM »

Very impressive. I've been looking to get that lens myself for this purpose (among others). From your description, I'm guessing it's a pretty dark site?

Thanks! 

It's a very dark site.  I measured it last Summer, and it was approaching 22.0 visual magnitudes per square arc-second.  The only problem is eastern Oregon.  It's rarely clear in the Winter.  The Summer is generally clear, but then your contending with smoke-filled skies from wildfires.  :(  When things do work out, I get about 6-8 opportunities a year during the New Moon window.

Wade

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