| Moderated by: chrisbet, | Page:   1 2 3 4 5 6   |
|
|||||||
| I collected my new D200 Infra Red from Eric - Page 3 | |
| And made some test exposures - discussion | Rate Topic |
| Author | Post |
|---|
| Posted: Tue Aug 12th, 2014 18:15 |
|
21st Post |
Robert
|
720nm. The 'normal' IR pass filter as far as I know.
____________________ Robert. |
||||||||
|
| |||||||||
| Posted: Tue Aug 12th, 2014 18:26 |
|
22nd Post |
jk
|
Hmmm.. When LifePixel first offered these filters did we all get the same ones? I think that we bought ours first then when Eric got his there was a new improved version that he got. Maybe I dont remember accurately the exact changes they made to the filter but I think it was a subtle change. I think we will need to meet up at Westonbirt again with the IR cameras and compare results. I will probably come across to UK late September or early October which should be perfect for the autumn colours there. Do you remember the special green and grey cards you made up many years ago ? Are you using these to WB the camera or are you using grass?
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
||||||||
|
| |||||||||
| Posted: Wed Aug 13th, 2014 03:46 |
|
23rd Post |
Eric
|
jk wrote:What was the replacement filter that was fitted to the D200 ? It was supposed to be 720 as is my Fuji. Of course it depends on the custom wb you set. But it's my recollection that the temperature can't go any lower than 2000 in ACR ...so all IR shots are 2000. It's only the tint that varies ! I found all my D70 were -80ish tint whereas the D200 are-64ish. I've never tried it but arguably you don't need ANY wb in camera if you shoot IR in raw. Just use a preset in ACR to 2000/-80.
____________________ Eric |
||||||||
|
| |||||||||
| Posted: Wed Aug 13th, 2014 03:46 |
|
24th Post |
Robert
|
This isn't a Lifepixel filter (I don't think). There are sources in Europe, Schott? Glass for one, where I think my 'Venus' UV band pass filter was sourced. Lifepixel started to make other wavelength filters available but I am not aware of a 'better' 720nm filter unless they widened the pass band, but that might not be an improvement? Just checked, David at ACS supplies 720 and 830nm filters but can supply others to order. The 830 images i have seen are way too stark and contrasty for artistic photography (unless of course that is the effect you want), more for forensic use I suspect. I may ask him for a spectrum graph of the ACS 720, just to see what I got but It works well, so in some ways there isn't much point except to guide others in the same direction and from an interest PoV. This is an interesting site for bandpass charts: http://rocoes.com.tw/2008e/optical/bandpass.htm And: http://rocoes.com.tw/2008e/optical/camfilter.htm This page may provide a springboard to further information, some understanding of German may be needed! LOL: http://www.baader-planetarium.de/sektion/s45/canon_astroupgrade-english.htm Westonbirt sounds great, just let me know when. I really enjoyed the last visit, I have a fresh car now so perhaps the exhaust won't fall off on the way home!!! LOL Yes I still have the green and grey cards, use the grey occasionally, The D200 is pre set by Eric but as he mentioned, it's all adjustable in processing by setting the WB to 2000 and tint to 80 or thereabouts. My D1 is set from brightly Sunlit grass. As an aside, I remember from when I first used Bibble 4 the WB seemed to adjust lower than 2000 which seems to be the lower limit in must software/hardware and that was one of the reasons I switched to Bibble for the IR photo processing plus I liked the subtle control of the light shades often found in UV images. I have found now I am getting more proficient with Ps that isn't such an advantage but I did like the way Bibble 4 worked. There is also focus the de-cluttering factor of just using one application, rather than having to learn the finer and complex controls of multiple deep application software.
____________________ Robert. |
||||||||
|
| |||||||||
| Posted: Wed Aug 13th, 2014 04:37 |
|
25th Post |
Eric
|
OK I am talking part rubbish here ....my memory needed sorting!!! I have just revisited the 3 generation raw files (D70/D200/Fuji) The image below shows the difference. On the left the 'as shot' settings D70 2000/-85, D200 2000/-64, Fuji 2000/-77 Alongside the D200 and the Fuji are their default files adjusted to -85. In doing this I have rejogged my memory. Firstly, there is less difference between the D70 and D200 as shot colours than I remembered. The Fuji is clearly a different glass source! But the reason why I adjusted the D200 back to -85 was NOT to get it closer to the D70 but to null out some of the magenta in the tint. I found the D200 images slighty (doesn't show on screen) more red/magenta When you try to play with residual colours I found Magenta a messy hue to have present...it makes things greeny when you do any channel mixing (without a lot of manual intervention) I shifted the hue back to -85 on the D200 because it gave a purer yellow overall cast which was easier to work with ...especially when flipping to the complimentary colour blue! There were less spurious colours creeping in. My memory was correct with regard to WHAT I did...not WHY!!!! Robert Its interesting that ACR is limited to 2000 temperature when you say Bibble allowed less. It seems to me THAT is what is required to null out residual colour on the files...be that magenta or yellow. Of course full or partial desaturation can do that. But having SOME colour there does make creative tinting easer. How do the D1X raws compare to the D200 and what numbers? Jonathan What are you using for p[rocessing the D70 IR shots? If ACR, are the numbers the same 2000/-85? Attachment: tints.jpg (Downloaded 28 times)
____________________ Eric |
||||||||
|
| |||||||||
| Posted: Wed Aug 13th, 2014 04:56 |
|
26th Post |
jk
|
Thanks Robert and Eric. That information is very useful. I need to work out what the Tint slider really does. Those Fuji images look really delicate, subtle. This is getting more and more tempting but I need to see what is released at Photokina. I will then decide if to convert my XE1 or XPro1. I like the size of the XE1.
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
||||||||
|
| |||||||||
| Posted: Wed Aug 13th, 2014 05:05 |
|
27th Post |
Eric
|
One other point about colour casts. As you know when taking recent holiday shots with the Fuji I struggled with hotspotting on my available lens. The Fuji shot shows a hotspot despite my attempt to minimise it with aperture and focal length choice. If you bang the saturation up to maximum you can more clearly see this central anomaly and more annoyingly, its a blue colour. This anomaly therefore not only introduces an optical flaw but a chromatic shift...which when you start messing with colours can reeeaaally slew the result across the image. Its also puzzling why the hotspot IS blue? Does this mean the anomaly happens at the sensor rather than in front of the IR filter? Why would it respond differently in colour if it was just internal lens glass reflection????  I saw this phenomena some time ago and incorporated this knowledge into my hotspot removal sequence. FYI KNOWING the hotspots are blue-magemnta I first try to eliminate these colours from the image (hence the desire to shift to a yellower overall tint). Essentially that is nothing more than using hue/sat set to blue and then magenta channels, decreasing saturation AND modifying the lightness to balance some of the exposure difference to the rest of the image. Once that's done I can mask to correct the slight over exposure in the centre of the image. Only then I can get on with the normal messing about. :thumbsup: Attachment: hotspot.jpg (Downloaded 28 times)
____________________ Eric |
||||||||
|
| |||||||||
| Posted: Wed Aug 13th, 2014 06:06 |
|
28th Post |
Eric
|
jk wrote:Thanks Robert and Eric. The tint slider is the green -> magenta The temperature slider is the blue -> yellow
____________________ Eric |
||||||||
|
| |||||||||
| Posted: Wed Aug 13th, 2014 08:21 |
|
29th Post |
jk
|
Getting more what I visualize and want from my IR photos these days. Attachment: D70IR-1-0758-2.jpg (Downloaded 25 times)
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
||||||||
|
| |||||||||
| Posted: Wed Aug 13th, 2014 08:23 |
|
30th Post |
jk
|
And then really messing with it. Attachment: D70IR-1-0758.jpg (Downloaded 25 times)
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
||||||||
|
| |||||||||
| This is topic ID = 1072 Current time is 05:55 | Page: 1 2 3 4 5 6 | |
| Nikon DSLR Forums > Camera and Lens Forums > Specialised Photography - Macro, UV, IR, Underwater > I collected my new D200 Infra Red from Eric | Top | |
Users viewing this topic |
||
Current theme is Modern editor
| A small amount of member data is captured and held in an attempt to reduce spammers and to manage users. This site also uses cookies to ensure ease of use. In order to comply with new DPR regulations you are required to agree/disagree with this process. If you do not agree then please email the Admins using info@nikondslr.uk Thank you. |
Hosted by Octarine Services
UltraBB 1.173 Copyright © 2008-2025 Data 1 Systems
Page processed in 0.0664 seconds (66% database + 34% PHP). 82 queries executed.
UltraBB 1.173 Copyright © 2008-2025 Data 1 Systems
Page processed in 0.0664 seconds (66% database + 34% PHP). 82 queries executed.