April 19, 2014, 01:00:08 AM

Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Messages - g2

Pages: [1] 2
1
Black & White / Re: Black and White Landscapes!
« on: November 11, 2013, 06:04:36 AM »
Thank you Krob78 and Mr Bean :)

Playing around with some Antelope Canyon shots from a couple of years ago...people typically accentuate the colors, thought I'd try something different.  Hopefully I didn't go overboard  ;D

Awesome! Amazing shades in these.

2
Black & White / Re: Black and White Landscapes!
« on: November 09, 2013, 12:24:52 PM »
Few from me :)




Seascapes okay?







Cheers! :)

3
The spectral sensitivity curve of digital and film are fairly different (and films differ widely, too, which is why there were so many types available).   The CFAs differ between cameras, too, so you'll even see differences between converted dSLRs of different models.

Thanks.
Possible to develop filters matching some film frequencies to emulate the same look?

4
The AA filter blurs the image to remove moirĂ©.  Noise is introduced later in the image chain, at the sensor and after.  Fine detail tends to mask noise, actually.  I expect you're seeing the aliasing that results from the reduction in strength of the AA filter (AA = anti-aliasing, after all...).

Thanks.
That makes perfect sense, noise is generated by the sensor (and not present in the scene) so AA filter would not make any difference.
I just found the pics had more noise than from my ex 30D, guess it's just the 18mp sensor.

One more question.
When I see pics taken on film they seem to have different colour tones when compared to digital, is it anything to do with film being sensitive to IR (and UV perhaps) and distorting the colour a bit? We can see the colours being distorted in the example hgraf has posted.
Does that make sense? Sorry late Friday night and have had a few ;D

Cheers ;D

5
Half correct.  Literally!  ;)  The AA filter is actually a two-part filter, with separate horizontal and vertical filters.  The horizontal part is in the 'outer' stack (which vibrates as part of the self-cleaning sensor) - that's removed as part of the conversion.  The vertical part of the AA filter is fused to the CMOS sensor itself (along with the microlenses and CFA), and is not removed with the conversion.

 ;D ;D Thanks.

Wold removal of half of the filter result in more noise in pics?
AA blurs fine details a bit so I'm guessing it would blur the noise too and make pics appear cleaner.

6
One question.

I mentioned the images from my converted cam seemed crisp with more noise, my assumption was that when they replaced the hot mirror filter with a clear glass filter the anti aliasing filter was removed as well, I assume it would be part of the hot mirror filter.
Is this correct?

7
@hgraf
Thanks for all the info mate :)

Funny, this post was started in September last year and is generating interest now ;D
All info is still appreciated of course.

8
Some pics from my end.
Not shot anything in ages and I miss it so terribly  :(
These were shot a while back.

Cheap 720nm



Cheap 720nm



UV-IR



Tiffen Red (600nm or so)

9
I got the full spectrum conversion done from lifepixel, pretty pleased with their service  :)

I like the IQ I get from the camera, pics are nice and crisp, noise seems a bit more, not sure if these are due to the conversion or just the output from a 600D in general as I bought it and directly sent it in for the conversion.

You need to custom WB everything, auto WB will not work, also I have read that the phase detect AF won't work in IR very well as the cameras are calibrated for visible light and IR focuses at different wave lengths, contract detect (the slow live view focus) works fine.
 
I use the MaxMax UV-IR cut for visible light and have Marumi 700nm, Tiffen red (around 600nm) and a cheapo 720nm for IR  :)

I wouldn't touch the insides of the camera myself and what you have mentioned about the screws is very scary indeed.

Liepixel sells only the filters for DIY conversion but they cost 2/3 of the cost of the conversion, check them out if you are in need of the filter only.

Cheers,
g2

10
Thanks mate, I got the conversion done a while back, couldn't resist. (shortly after this question actually ;D)

You doing the conversion yourself?

11
Lenses / Re: Infra red filter - question
« on: May 20, 2013, 08:52:05 AM »
Are there any updated resources of what lens to use and what not?


There ya go :)
http://kolarivision.com/lenshotspot.html

I have no affiliation with them, had done a lot or research before getting my camera converted and the link was in my bookmarks. I got a 600D converted to full spectrum by lifepixel, very happy with their service.

Cheers,
g2

p.s. Not sure how accurate their list is but it is elaborate.



Thanks for that!  :)


No worries :)

12
Lenses / Re: Infra red filter - question
« on: May 18, 2013, 07:37:21 AM »
Full spectrum is another option if you are considering a conversion. It allows you to shoot UV, IR or visible light via the use of external filters. I took this route.

Just to show an example. same scene in Visible light and IR 600nm.

Visible light (UV/IR cut filter)



IR 600nm (Tiffen red filter IIRC)


g2
 

13
Lenses / Re: Infra red filter - question
« on: May 18, 2013, 07:20:13 AM »
Are there any updated resources of what lens to use and what not?


There ya go :)
http://kolarivision.com/lenshotspot.html

I have no affiliation with them, had done a lot or research before getting my camera converted and the link was in my bookmarks. I got a 600D converted to full spectrum by lifepixel, very happy with their service.

Cheers,
g2

p.s. Not sure how accurate their list is but it is elaborate.

14
Anyone? :)

15
Howdy,

I'm thinking of getting a T3i (600D) converted to full spectrum. Objective is to use it for IR and visible light (with external filters) Have a few queries, would appreciate if any of you could help me with them.

1. How good will the visible light IQ be with a quality UV/IR cut filter when compared to a stock camera?

2. I've read different wavelengths of light focus at different focal planes resulting in chromatic aberration when shooting full spectrum, any remedy to this? Also would I still get CA when say shooting only IR or Visible with filters?

3. Your recommendations on a quality UV/IR cut filter.

Would love to see some samples, if you have any please do post.
Any additional info you can provide would also be appreciated.

Thanks,
g2

Pages: [1] 2