[bobbotron]

I brought my R72 IR filter along to Coronado, here are some photos taken with the K3iii (unmodified), the DA 18-135mm and an IR R72 filter. Not bad if I do say so myself!

[K-Three]

Nice work, Inspiring, I've got some IR filters hidden away somewhere, Used with Kodak B&W IR, and Ektachrome IR way back in then day.
I really like your first shot of the Coronado, Iconic shot of an iconic building.

[jumbleview]

Nice. Can you share some details about technique: exposure, shutter, ISO, how did you focus?

[bobbotron]

Nice. Can you share some details about technique: exposure, shutter, ISO, how did you focus?

Thanks! So I:

• set my ISO to 100,
• use live view,
• remove the eye cup and install the (I don't know the name for it) view finder black out thinger to avoid getting light leaks (this *will* happen on a sunny day doing IR work)
• shoot in full sun, works best when the sky is blue
• set it to A mode, around f/11 or f/8
• focus with the IR filter on in LV mode (the K3iii can lock on focus despite the effective amount of light is quite low)
• set the camera to a short self timer

You can click on each image for their EXIF data on Flickr. The exposures are around 20 seconds.

In a photo editor you have to convert them to grey scale and work on the photo curves heavily, you're really getting a band of image data in the middle of the curve histogram, you have to stretch it out.

[kypfer]

Nice examples
I'm always envious of these locations where there's apparently no wind and the foliage comes out pin-sharp after a multi-second exposure!

[Astropaps]

Nice examples
I'm always envious of these locations where there's apparently no wind and the foliage comes out pin-sharp after a multi-second exposure!

Yeah. That might happen a fed times a year in the middle of the night where I live. Those IR shots are very cool!

[Medex]

IMO infrared effect is mediocre because OEM UV-IR cut filter is left in place. You capture just small amount of IR light. and this shot is 10 s exposure.
My solution: simple K-30 moded with IR filter on the sensor. You have resolution (No AA filter) and exposure time advances, can shoot handheld and focus properly EVEN using OVF.

[ProfessorBuzz]

Great shots. Which brand of IR 720nm flter do you have?

[bobbotron]

Nice examples
I'm always envious of these locations where there's apparently no wind and the foliage comes out pin-sharp after a multi-second exposure!

I lucked out, those areas have a lot buildings blocking the wind.

Blurry ir shots are cool too, you can get a real dreamy effect!

[kypfer]

IMO infrared effect is mediocre because OEM UV-IR cut filter is left in place. You capture just small amount of IR light. and this shot is 10 s exposure.
My solution: simple K-30 moded with IR filter on the sensor. You have resolution (No AA filter) and exposure time advances, can shoot handheld and focus properly EVEN using OVF.

Unfortunately, for the amount of i/r work I do (or want to do) I can't justify the cost of getting a camera modified, even if I could find someone in the UK prepared to work on a Pentax.
I'd be prepared to do the work myself, but I'd need detailed instruction for a specific model, probably a K200D, and a source of appropriate filter material in the UK.
In the meantime, I'll wait for the wind to drop

[phoebus]

Unfortunately, for the amount of i/r work I do (or want to do) I can't justify the cost of getting a camera modified, even if I could find someone in the UK prepared to work on a Pentax.
I'd be prepared to do the work myself, but I'd need detailed instruction for a specific model, probably a K200D, and a source of appropriate filter material in the UK.
In the meantime, I'll wait for the wind to drop

I got my K-5 modified to full spectrum by Advanced Photo Services in UK (enquiries@advancedcameraservices.co.uk)

Not cheap, but it works really well for both IR and UV with appropriate filter - really glad so many Pentax lenses have 49mm filter thread!!

[lmd91343]

Great work! Especially the first.

Using an unmodified K33 with an R72 filter is still faster and cheaper than IR film.

Think twice about converting an older camera to IR. I converted a K10D and was sorry I did. I couldn’t use newer lenses, live view, or GPS in addition to other new features. I am glad I got a used K32 converted to IR recently.

[Medex]

I got my K-5 modified to full spectrum by Advanced Photo Services in UK (enquiries@advancedcameraservices.co.uk)

Not cheap, but it works really well for both IR and UV with appropriate filter - really glad so many Pentax lenses have 49mm filter thread!!

Can you still get proper autofocus using optical view finder / phase detection AF module?

[phoebus]

Can you still get proper autofocus using optical view finder / phase detection AF module?

The PDAF works OK with no filter, alright with IR and not great with UV. The CDAF is better than I remember unmodified. However, the OVF is unusable with either filter on. I consider the modded K-5 as a robust K-01, the SLR part is not really happening. All that doesn't really matter, as my real reason for converting is to use the great K-5 sensor for astro.

[Medex]

The PDAF works OK with no filter, alright with IR and not great with UV. The CDAF is better than I remember unmodified. However, the OVF is unusable with either filter on. I consider the modded K-5 as a robust K-01, the SLR part is not really happening. All that doesn't really matter, as my real reason for converting is to use the great K-5 sensor for astro.

K-01 has different sensor compared to K-5 (they share 16 mpix, but physically differ); K-01 uses 12-bit processing compared to 14-bit in K-5.