K3 IR - not bad!

**bobbotron** · 06-22-2015, 01:49 PM - **1 Like**

I was doing some IR photography with a film camera and threw the R72 filter on my K3 and took this photo. It takes a long exposure but the resulting image definitely has some IR look to it. F8, 15 second exposure on a bright day, ISO 400. Two of the same photo, I can't decide which PP'd result I like better.

I did notice there's a lighter horizontal band just above the dock, I'm not sure what that's from. Another test IR photo there were a few of them - could be some kind of IR lens flare, or the sensor acting up with these long, dark exposures?

DeadJohn · 06-22-2015, 01:56 PM

Cover the viewfinder during daytime long exposures because light can sneak in the back of the camea. That might fix your banding issues.

Doundounba · 06-22-2015, 01:57 PM

Nice results!

Originally posted by bobbotron

I did notice there's a lighter horizontal band just above the dock, I'm not sure what that's from.

Did you cover up the viewfinder during your exposures? I find that I get similar banding on (visible light) long exposures if I don't cover up the viewfinder - light leaks in from there...

starbase218 · 06-22-2015, 03:00 PM

Originally posted by Doundounba

Nice results!

Did you cover up the viewfinder during your exposures? I find that I get similar banding on (visible light) long exposures if I don't cover up the viewfinder - light leaks in from there...

Yup, same experience here. With the K-3, you really have to cover up the viewfinder.

**bobbotron** · 06-22-2015, 04:41 PM

Thanks everyone! I didn't cover up the viewfinder, I'd totally forgotten about that. Will experiment more and post back my findings here. Now to find that little view finder cover...

hoopsontoast · 06-23-2015, 01:21 AM

Yeah, I had the same outcome a couple of weeks back with the lack of cap on the viewfinder on long exposures.

Nice results though

**bobbotron** · 06-23-2015, 04:41 PM - **1 Like**

Thanks everyone. I took another few test photos today, with the viewfinder block up. No banding, looks like that did it. I'll post some more photos when I get some more decent shots.

06-22-2015, 01:49 PM - 1 Like	#1
bobbotron Site Supporter Join Date: Jan 2015 Location: Ottawa, ON Photos: Gallery Posts: 3,349	K3 IR - not bad! I was doing some IR photography with a film camera and threw the R72 filter on my K3 and took this photo. It takes a long exposure but the resulting image definitely has some IR look to it. F8, 15 second exposure on a bright day, ISO 400. Two of the same photo, I can't decide which PP'd result I like better. I did notice there's a lighter horizontal band just above the dock, I'm not sure what that's from. Another test IR photo there were a few of them - could be some kind of IR lens flare, or the sensor acting up with these long, dark exposures?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
IR with K3	miltona580	Pentax K-3 & K-3 II	25	07-20-2017 12:47 AM
K3 II pixel-shift samples on IR. I'm impressed	jonby	Pentax K-3 & K-3 II	42	06-02-2015 12:28 AM
K-500 IR remote not working?	chris141058	Pentax DSLR Discussion	19	03-27-2015 09:14 AM
Image Sync Not Bad!	lawsonstone	Pentax K-S1 & K-S2	2	03-18-2015 10:04 AM

06-22-2015, 01:56 PM	#2
DeadJohn Pentaxian Join Date: Jan 2011 Location: New York Posts: 4,834	Cover the viewfinder during daytime long exposures because light can sneak in the back of the camea. That might fix your banding issues.

06-22-2015, 01:57 PM	#3
Doundounba Pentaxian Join Date: Dec 2012 Location: Montréal QC Photos: Gallery \| Albums Posts: 2,351	Nice results! Originally posted by bobbotron I did notice there's a lighter horizontal band just above the dock, I'm not sure what that's from. Did you cover up the viewfinder during your exposures? I find that I get similar banding on (visible light) long exposures if I don't cover up the viewfinder - light leaks in from there...

06-22-2015, 03:00 PM	#4
starbase218 Inactive Account Join Date: Sep 2009 Location: Planet Earth, Sol system, Milky Way galaxy, Universe Posts: 1,119	Originally posted by Doundounba Nice results! Did you cover up the viewfinder during your exposures? I find that I get similar banding on (visible light) long exposures if I don't cover up the viewfinder - light leaks in from there... Yup, same experience here. With the K-3, you really have to cover up the viewfinder.

06-22-2015, 04:41 PM	#5
bobbotron Site Supporter Join Date: Jan 2015 Location: Ottawa, ON Photos: Gallery Posts: 3,349 Original Poster	Thanks everyone! I didn't cover up the viewfinder, I'd totally forgotten about that. Will experiment more and post back my findings here. Now to find that little view finder cover...

06-23-2015, 01:21 AM	#6
hoopsontoast Veteran Member Join Date: Jul 2013 Location: Oxfordshire Posts: 861	Yeah, I had the same outcome a couple of weeks back with the lack of cap on the viewfinder on long exposures. Nice results though

06-23-2015, 04:41 PM - 1 Like	#7
bobbotron Site Supporter Join Date: Jan 2015 Location: Ottawa, ON Photos: Gallery Posts: 3,349 Original Poster	Thanks everyone. I took another few test photos today, with the viewfinder block up. No banding, looks like that did it. I'll post some more photos when I get some more decent shots.