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TP: Infra-red with exisiting A-mount cameras

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Petrochemist View Drop Down
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Post Options Post Options   Quote Petrochemist Quote  Post ReplyReply Direct Link To This Post Posted: 22 December 2020 at 16:54
This is a rather old thread, but I thought it might be worth bringing it up-to date a little, as the mirrorless cameras (e-mount) are very different to use for IR.

My A7ii was full spectrum converted on immediately after I brought it.
With mirrorless cameras there is no problem seeing through any filter that the camera can see through. The EVF shows what the sensor see's irrespective of if the eye can see those wavelengths...

IMO this very much improves the flexibility of converted cameras. I can stick a 860nm filter on the lens & the camera allows me to frame, focus etc just as it would with no filter at all. I can then switch to a filter that shows UV & again frame without problem.

So far I've used over 20 different filter types on my converted camera exploring combinations of visible & invisible light that can't be seen with a more restrictive conversion. I can the install a clip in behind the lens (UV/IR block) filter to restore relatively normal behaviour.

 



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Post Options Post Options   Quote Roger Rex Quote  Post ReplyReply Direct Link To This Post Posted: 29 December 2020 at 12:36
Here are two sites with a wealth of information about IR. They both convert cameras to IR. I have used LifePixel to convert both a 7D and an a900 and have been pleased with their work. A friend of mine, a highly accomplished professional fine art landscape and nature photographer, author, lecturer. etc. uses Kolari. Kolari's Lens Hot Spot Database is very useful.

Edited by Roger Rex - 29 December 2020 at 12:42
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Post Options Post Options   Quote dCap Quote  Post ReplyReply Direct Link To This Post Posted: 02 January 2021 at 13:39
I'm not sure how hard IR converted bodies are to find.
So, when I bumped into one when looking for something else, I thought y'all miht want to know - posted to external links:
https://www.dyxum.com/dforum/uk-export-too-used-a7r-infrared-not-mine_topic139085.html
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 02 January 2021 at 14:01
Originally posted by dCap dCap wrote:

I'm not sure how hard IR converted bodies are to find.
So, when I bumped into one when looking for something else, I thought y'all miht want to know - posted to external links:
https://www.dyxum.com/dforum/uk-export-too-used-a7r-infrared-not-mine_topic139085.html


Off memory , there's a couple of firms in the UK that do camera conversions , so availability isn't an issue .
So if you've got a spare camera , contact one of them about a conversion .
I've converted some of my own cameras to either full spectrum of infrared ( done a few for some friends too ) .
I've done a few Nikon D70's and a few NEX 3's and 3c's .
The NEX 3 I have is full spectrum do I can put any filter over the lens to determine what spectrum I'm shooting in , the 3C is 720nm .
There quite easy to work on .
see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
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Post Options Post Options   Quote dCap Quote  Post ReplyReply Direct Link To This Post Posted: 02 January 2021 at 14:04
Originally posted by neilt3 neilt3 wrote:

Off memory , there's a couple of firms in the UK that do camera conversions , so availability isn't an issue .
So if you've got a spare camera , contact one of them about a conversion .
I've converted some of my own cameras to either full spectrum of infrared ( done a few for some friends too ) .
I've done a few Nikon D70's and a few NEX 3's and 3c's .
The NEX 3 I have is full spectrum do I can put any filter over the lens to determine what spectrum I'm shooting in , the 3C is 720nm .
There quite easy to work on .


cool beans ... is there a thread in here showing the different results with each type (e.g. 720, full-spectrum, 900?)

ideal cameras/lenses to go for?
I saw a link awhile ago (fujifilm) on which lenses have hotspots and which don't
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 02 January 2021 at 14:52
There's a thread on here for which A mount lenses work well for i.r , and I think one for e mount .

Not all cameras can be converted as some have their filter pack's bonded to the sensor housing and can't be removed .

For sample images check out lifepixels website .
There's a themed view thread on here , but I'm not sure if people state what type of filter was used .
Looking on Flickr might be helpful if your interested , but again , it depends if people state what nm Pass filter was used .
I think most people just say UV , IR or full spectrum .
When I've used several filters on my full spectrum camera , I've never made a note on which was used . So it's not included if I post the image on Flickr .

Likewise I shoot quite a bit of infrared film , 35mm , 120 and 5x4 sheet film .
Depending on what lenses are used I might be using a Cokin P or Z pro filter at 720nm or a B&W 095 at 695nm .

Edited by neilt3 - 02 January 2021 at 14:56
see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
 



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Post Options Post Options   Quote Roger Rex Quote  Post ReplyReply Direct Link To This Post Posted: 02 January 2021 at 15:28
Originally posted by dCap dCap wrote:

   ... is there a thread in here showing the different results with each type (e.g. 720, full-spectrum, 900?)

I saw a link awhile ago (fujifilm) on which lenses have hotspots and which don't


The LifePixel website (link above in my earlier post) has a very nice presentation of the looks of the different IR conversions options. Kolari (link above as well) has the hot spot lens data base for many, many lenses, listing ones that don't have a hot spot and those that do.
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Post Options Post Options   Quote Petrochemist Quote  Post ReplyReply Direct Link To This Post Posted: 02 January 2021 at 17:44
Originally posted by Roger Rex Roger Rex wrote:

[QUOTE=dCap]     Kolari (link above as well) has the hot spot lens data base for many, many lenses, listing ones that don't have a hot spot and those that do.


My own experience with hot spots makes me think listings like the Kolari one are of dubious value.
I've found many of my lenses rarely give hotspots, but have done on occasion, down to the direction of lighting, focus distance, aperture, & even the camera it's used with.

My MFT kit lens gave terrible hotspots when I tried it on a bog standard body for long exposure IR, but has never caused issues on my converted body.

Several of the adapted lenses I've used on my A7ii tend to give hotspotd at short focus distances but are fine for landscapes...
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Post Options Post Options   Quote dCap Quote  Post ReplyReply Direct Link To This Post Posted: 02 January 2021 at 17:53
My (very very limited) understanding of hotspots is that is it "lens" and "aperture" and "sensor" specific ... so mileage may well vary.

I shot a few rolls of Kodak and Konica IR film back in the 90s when lenses had IR markings on them.

And I've had a 52mm Hoya R72 for about 10 years (still sealed) as a 'one day' try this again thing. So fast-forward to the benefits of digital (and more so mirrorless) and not the expensive guesswork of film! Gotta give it a whirl one day in 2021.
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Post Options Post Options   Quote Roger Rex Quote  Post ReplyReply Direct Link To This Post Posted: 05 January 2021 at 23:33
Originally posted by Petrochemist Petrochemist wrote:

Originally posted by Roger Rex Roger Rex wrote:

[QUOTE=dCap]     Kolari (link above as well) has the hot spot lens data base for many, many lenses, listing ones that don't have a hot spot and those that do.


My own experience with hot spots makes me think listings like the Kolari one are of dubious value.
I've found many of my lenses rarely give hotspots, but have done on occasion, down to the direction of lighting, focus distance, aperture, & even the camera it's used with.


My experience is quite the opposite. The Minolta lenses that I have that are shown in the list as good performers are all the time; the two Sony lenses on the list as bad performers are bad all the time. And my Sigma 12-24 listed as a good performer, is good all the time. This pattern of performance has been the same on both the a700 and a900. Perhaps this very consistent behavior in agreement with the Kolari data base is because I shoot primarily infrared at f16 so I certainly cannot speak to shooting wide open.
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Post Options Post Options   Quote waldo_posth Quote  Post ReplyReply Direct Link To This Post Posted: 06 January 2021 at 18:02
AS the Kolari lens hot sport database is concerned I would be reluctant with my applause. I did not do a thorough comparison with the Kolari recommendations - but one lens which I sold because it had such a strong hot spot (from wide open to stopped down) was the Zeiss Touit 12mm. It is listed as good performer on the Kolari site.

From my experience stopping down usually intensifies the hot spot - often from a mild one (which can be compensated in PP) to a harsh one. I would be amazed if there are lenses where this relationship is inverted.

It would be great to have information about the IR hot spot "behavior" of lenses at different apertures. The Kolari site is lacking that information.
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