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180mm Nikkor with 52mm step down ring.

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#1 vmsguy

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Posted 26 November 2012 - 09:23 PM

It's been a while since I have posted out here. Haven't been able to image much lately, but last week I took my modified T1i and my trusty 180mm Nikkor ED to North Carolina.

I was on the coast, and the moon was up, but the sky was clear.

I used a 72mm-52mm step down ring to stop down the 180mm to ~f/3.5.

The resulting image is 83 subs @ 120seconds each and ISO800. No darks, flats, or bias frames used in the processing. DSS to stack, and CS6 curves and levels.

Click HERE for cropped FULL res image.

Brent

Attached Files



#2 Nils_Lars

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Posted 26 November 2012 - 10:23 PM

Lots of details for 180s subs , that step down ring looks like it worked perfect.

#3 fco_star

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Posted 26 November 2012 - 10:40 PM

Beautiful image, I hope to get something like this with my Nikkor.... good job

#4 zjc26138

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Posted 26 November 2012 - 11:06 PM

Fantastic image!

#5 Phil Wheeler

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Posted 26 November 2012 - 11:13 PM

Nice, Brent. What mount did you use? Guided or not?

I hope to do similar things with my Canon 200L f/2.8 lens on a Vixen Polarie -- but I've yet to try it. Your results are encouraging.

#6 mmalik

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Posted 26 November 2012 - 11:21 PM

This is a beauty.

#7 vmsguy

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Posted 26 November 2012 - 11:24 PM

Erik,

I took 120 second subs. Couldn't go much longer because of the moon.

Brent

#8 vmsguy

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Posted 26 November 2012 - 11:26 PM

Hi Phil,

I use an unguided Orion Sirius mount. Camera and lens only, no piggyback.

Brent

#9 Phil Wheeler

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Posted 26 November 2012 - 11:27 PM

Thanks, Brent -- I sensed you were traveling a bit light from your message. A very nice result!

#10 LeCarl

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Posted 29 November 2012 - 09:40 PM

Wow! Sooo clean, beautiful horsehead! :shocked:

A very good lens! can you post a not cropped version? (I want to see the corners if possible) ;)

I really like simple setup! step down is a good idea too! (instead of using the diaphragm that make stars look fuzzy!)

My 200mm F3.5 At F6.8 look a way worst than this! (and soo dark!)

#11 vmsguy

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Posted 30 November 2012 - 12:12 AM

Yes,

I'll post a full res image tomorrow when I get to work. It is on my laptop there. The full res image has a good bit of vignetting because I didn't take flats and was pretty aggressive in stretching to get to the data with 2 minute exposures at iso800.

Brent

#12 vmsguy

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Posted 30 November 2012 - 01:59 PM

Here are links to 3 images, all unprocessed.

DSS output as 16bit Tiff
DSS output as jpg
Single 120 second frame.

Stacked tiff: (88 MBytes)
http://webpages.mars...master1-83f.TIF

Stacked jpg:
http://webpages.mars...master1-83f.jpg

Single frame:
http://webpages.mars...-800iso-063.jpg

Brent

#13 dp297

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Posted 01 December 2012 - 05:07 AM

Beautiful...thanks for sharing Brent

#14 LeCarl

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Posted 01 December 2012 - 12:46 PM

WOW! Yeah, thanks for sharing, this image was sooo good!!!
Now, I need this lens!!! ;)
(sickness about buying new/old things!)

The corners are very good, maybe closed to F4, it can give perfect wide field!

Flat is a must and easy to do at this focal, imagine what this lens can do in a dark site, guided, dithered, with Ha! :grin:

Starting today to try sell my 2011 nikkon 70-300 VR EDII (not good at F5.9... fixed focal is better)

Your lens exact specs? pictures?

(I want to thanks you again, very good images, very informative too! ) :bow:

#15 vmsguy

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Posted 02 December 2012 - 01:13 AM


The lens I used is the f/2.8 180mm ED Nikkor, manual focus.

Here is a Ken Rockwell review.
http://www.kenrockwe...ikon/180f28.htm

Here is another review from Jerry.
http://www.astropix....NIKON_180MM.HTM

This is a great lens, that has gained a strong following from us astro imagers.

I picked mine up on eBay several years ago, and you can still find them there occasionally.

I need to create a web page of my images using the 180mm. Some of them were taken at very dark sites.

Brent

#16 spectre

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Posted 02 December 2012 - 12:58 PM

Francisco, I have virtually the same equipment you do. I'll be very interested to see your results with the Nikkor 180mm. I'm in the market for a lens for widefield and I'm leaning that way

#17 fco_star

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Posted 04 December 2012 - 08:43 AM

Spectre, I can tell you that I love my Nikkor 180, stop at 4 you get perfect stars, my best so far is M31 1 hour of integration time, I'm wondering what this lense could do in a dark site ;)

M31 Nikkor 180mm

#18 nofxrx

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Posted 04 December 2012 - 08:33 PM

Hey Brent! Brent here, telling you this is a wonderful image! lol
Almost like referring to oneself in the third person, but also not...very confusing..

How much was this cropped? just curious what the FOV is like for this area as I am going to be testing mine out in the same area later this winter..
I just picked one (Nikkor 180ED) up to go with my Nikon D800 (OH THE HORROR!!Not Nikon?!?!? LOL) for only $250! ;)

#19 vmsguy

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Posted 05 December 2012 - 01:14 AM

Hi Brent,

A few posts up I have links to some full frame images.

They are all unprocessed, a 16 bit tiff, a jpg, and a single sub.

Brent

#20 SunBlack

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Posted 05 December 2012 - 10:04 AM

Nice image, vmsguy. I dont notice vignetting introduced by the stepping down ring on the unprocessed frame. I wonder how the ring will work on a FF camera.....

#21 dp297

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Posted 07 December 2012 - 02:41 PM

OK....I think that this lens will be my next buy...it is fantastically sharp and there is tons of information in there without chromatic abberation at all...
Here's my rendition of your data....

Attached Files



#22 vmsguy

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Posted 07 December 2012 - 03:32 PM


DP,

Would you mind sharing some of your processing steps?

I like the way you brought out the 'filament' details in the
Horsehead area.

When I try to sharpen too much, I get bad artifacts.

I'm pleasantly surprised with the amount of detail using 2 minute exposures at iso800.

Brent

#23 fco_star

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Posted 07 December 2012 - 03:32 PM

Dimitris, I consider the Nikkor 180 one of the best AP lenses, your rendition is great :)

#24 dp297

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Posted 07 December 2012 - 03:36 PM

Well,
I am using Pixinsight....

here's my rough process...however, your data was so good that the whole thing was a piece of cake...

Pixinsight Image Processing Workflow
LINEAR
1. DSS: Save as 32-bit floating point TIFF
2. Insert TIFF from DSS
3. RGBWS R:G:B 1:1:1
4. STF
5. Dynamic Crop
6. DBE
7. Background Neutralization
8. Color Calibration
9. SCNR
10. Morphological Transformation tools (Morphological Selection) with mask [http://blog.deepskyc...ological-.html], Make stars of RGB smaller to avoid color halos
11. ATWT small star sharpening
12. GREYCstoration
13. ACDNR for chrominance with mask

NON-LINEAR LUMINANCE
14. Luminance Mask - extract the Luminance channel, and apply a Histo to it to that
gives a strong Luminance Mas k, to protect the dim areas
15. Make stars smaller
16. Deconvolution (Dynamic Point Spread Function Process Generates a Synthetic PSF Image-Use Synthetic PSF Image-Use Deringing Support Image-Use Luminance Mask) [http://www.drakevisu.../deconvolution]
17. Noise Reduction (MMT- on the first 2 or 3 wavelet layers of the image, to good effect. I mask the image first with the Luminance Clone so that noise reduction is restricted to the background)
18. Mas ked HDRWT - now that the image is no longer linear, HDRWT has 'more range' to work with, and can thus be more effective - applied to Layer 3
19. Mas ked HDRWT #2 - as before, default values , except that it is applied toLayer 4
20. Mas ked HDRWT #3- as before, default values , except that it is applied to Layer 5 (sometimes this is 'too harsh', and I need to decide which two layers to apply HDRWT to – experimentation usually required)
21. Enhance Dark Structures
22. New Luminance Mask - extract a mas k to protect the brightest areas, using Luminance
channel, ATW, Histo, etc - this is not an easy step to define, or explain, and it may even have to be applied earlier in the overall process as well
23. Mas ked HISTO /Lum-CURVE - (this may also have to be done earlier as well) here I would be trying to increase the brightness of the faintest regions , without blowing out brighter regions - this HAS to be 'subtle'
24. Sharpen Luminance




NON-LINEAR CHROMINANCE

25. Sequential MaskedStretch (0.1/0.2/0.3, 200 repeats) with shadows clipping
26. ATW/ACDNR for Chrominance for small scale noise with no mask
27. ATW/ACDNR for Chrominance with lightness mask
28. Masked Sat-CURVE - trying to bring out the colours of the dimmest areas- again, subtlety is important
29. Inverted Masked Sat-CURVE - this time looking at colour in the brighter areas, remembering that over-saturation will look bad
30. SCNR - looking at the whole image, several s mall iterations may be needed to balance out color casts
31. ACDNR#2 - a recheck of ACDNR to make sure that no low-level noise has crept back in

LRGB COMBINATION

32. HISTO adjustment to Luminance and Chrominance
33. CURVES (Contrast enhancement with Curves - protect background with mask)
34. Sharpen (ATW-protect background with mask)
35. Noise Reduction with ACDNR or MMT (invert mask- MMT should be used with a mask to protect the high SNR areas)
36. HDR Multiscale Transform to bring out structure and enhance contrast. MMT should be used with a mask to protect the high SNR areas, and HDRMT with the mask inverted to protect the low SNR areas
37. Multiscale Processing (http://www.astro-ima...ght/M33/en.html)
38. Tone Mapping
39. Reduce size of large stars (MT)
40. HISTO


#25 LeCarl

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Posted 08 December 2012 - 12:19 PM

Pixinsight seem very powerful! wow! insane treatment! (positively) :grin:
how much time this takes?, it seem to have tons of steps, easy or not, name of the process don't help me, remind me nothing! haha!?

I bought my 180mm today, I pay near 230$, not perfect exterior cosmetic, but very clean glasses (important)

To vmsguy : the review is very informative, thanks you to share!!!

I guess, I will like this lens so much, particularly in winter! haha! :p






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