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Lenses and unmodified cameras for Infrared (IR)

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groovyone View Drop Down
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Post Options Post Options   Quote groovyone Quote  Post ReplyReply Direct Link To This Post Posted: 03 May 2010 at 18:47
Updated the first post
A99|A900|A100IR|A7|Maxxum 7|Maxxum 5|Polaroid
 



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twm47099 View Drop Down
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Post Options Post Options   Quote twm47099 Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2010 at 04:44
I have a modified A100. When I bought my A700, I got "stuck" having to buy the kit with the 18-70DT lens. When I spoke to Mark Soares about the conversion, he suggested getting the camera calibrated with the 18-70. He felt it would be a good choice for IR because it is a relatively simple lens. So I did.

It is the lens that stays on my A100-IR. I've taken a good number of shots with it and have only seen a hue-shift bright spot on a couple of occasions. I haven't seen it enough to have a clear indication of when it occurs. Also it doesn't cause me any problems with B&W conversion, only if I try to use the shot in color.

I did run some tests with the 18-70 and my Minolta 35 f/2 shooting a sunlit white wall. Focus distance was very close (5 feet). Both showed a spot which became more prominent as I stopped down. I haven't tried the 35mm on real subjects, but as I mentioned I don't see a hot spot in most of my shots with the 18-70.

tom
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Edinator View Drop Down
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Post Options Post Options   Quote Edinator Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2010 at 19:08
The Sony 18-70 lense is pretty good. There is a very faint and large hot spot in the centre of the image as you stopped down.

My current IR lense is the Minolta 28-85 F3.5-4.5. There are no hot spots and focusing is nice and fast. There is some flare at certain angles with the sun but it is the same as any other lense on a normal camera. The lense is free of hot spots even when stopped down to F10 (that's as far as I've tested).

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groovyone View Drop Down
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Post Options Post Options   Quote groovyone Quote  Post ReplyReply Direct Link To This Post Posted: 16 July 2010 at 15:36
Updated the list with the 35G and 85Z.
A99|A900|A100IR|A7|Maxxum 7|Maxxum 5|Polaroid
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Twah View Drop Down
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Post Options Post Options   Quote Twah Quote  Post ReplyReply Direct Link To This Post Posted: 07 November 2010 at 00:13
Please Add the Minolta 35-70mm. It works beautifully with IR. I.R. with Minolta 35-70
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groovyone View Drop Down
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Post Options Post Options   Quote groovyone Quote  Post ReplyReply Direct Link To This Post Posted: 07 November 2010 at 00:38
Originally posted by Twah Twah wrote:

Please Add the Minolta 35-70mm. It works beautifully with IR. I.R. with Minolta 35-70


Added it. Thanks for the input!
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Post Options Post Options   Quote Twah Quote  Post ReplyReply Direct Link To This Post Posted: 07 November 2010 at 00:54
Just want to say thanks for creating this threat. I've been trying to find a wider lens for IR that doesn't produce hotspots. For anyone wanting a lens, I'd recommend the Minolta 35-70 because you can get it for about $25-50 (USD) on eBay. It's awesome as long as you don't want to go wider. So I'm bidding on a 18-55 sam since people said it works great so we'll see if I get it.

again, thanks for this because it's so hard trying to find lenses that don't create Hotspots.

I have a IR (715mm) converted Minolta 7D and it's great fun to play with. If anyone is using a filter, I would definitely recommend converting a camera to IR because it's basically point and shoot instead of having to truck around a tripod for long exposures.

Thanks! If I get that 18-55 and if I remember, I'll post results to my IR picasa web album for all to see.

thanks
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Twah View Drop Down
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Post Options Post Options   Quote Twah Quote  Post ReplyReply Direct Link To This Post Posted: 07 November 2010 at 00:56
Oh also Add to Decent list. Minolta 35mm F2. There is a very slight hotspot. It is hard to see but it is noticeable but it's not like the Tamron 17-50 hotspoting which it's UGLY! haha.
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Bass View Drop Down
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Post Options Post Options   Quote Bass Quote  Post ReplyReply Direct Link To This Post Posted: 07 November 2010 at 01:19
Firstly, a big thank you to groovyone for maintaining this thread for over a year. It is a great reference and thanks also to all those who have contributed. It's threads like these that make Dyxum a great place to hang out and find information   

I personally think this thread should be a sticky - information on IR / UV photography for the 'A' Mount is hard to find?

I am new to photography outside of the visible spectrum and am curious about IR but also UV. Is it safe to assume that lenses that work well in the IR wavelengths (hot spots, focus shifts etc) would be suitable for UV? Has anybody got any first hand experience with both?

Along with the lenses listed on the first page, is there knowledge about older MD Minolta lenses & M42 and how they perform with IR / UV?

I'm keen to gather more information before I make the commitment to mod my A100.

Thanks again.
MB
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Alex H View Drop Down
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Post Options Post Options   Quote Alex H Quote  Post ReplyReply Direct Link To This Post Posted: 07 November 2010 at 01:55
Originally posted by Bass Bass wrote:

Is it safe to assume that lenses that work well in the IR wavelengths (hot spots, focus shifts etc) would be suitable for UV?


No, it is not true. Most of the current lenses, that work fine for IR, will not be usable for UV, since most of the optical glass and optical cements (used to fuse lens elements in groups) will block most of the UV.

There is a number of very specialized UV lenses made of fused quartz, but they are very expensive. Anyone on the budget can look into some El-Nikkor enlarger lenses and Novoflex 35mm lens. Do not forget about filters.

Originally posted by Bass Bass wrote:

Has anybody got any first hand experience with both?


I have a little experience in shooting UV. In fact that is what I was doing today, testing UV response of KM5D and A700. I may post a separate thread about Sony and UV photography tomorrow.

Originally posted by Bass Bass wrote:

Along with the lenses listed on the first page, is there knowledge about older MD Minolta lenses & M42 and how they perform with IR / UV?


As far as I know, there is no information on the internet about MD lenses being used for UV. There are some M42 lenses suitable for UV, including Novoflex 35mm lens (that one actually comes in different mounts).

Most of the UV photography (reflected UV) is done by Nikon shooters because:
- Many older Nikon DSLRs are "very" sensitive to UV unmodified, like the famous D70.
- Nikon was manufacturing the famous UV-NIkkor 105mm lens, which was still being made until recently. All current UV-dedicated lenses are made in Nikon mount:
(1) CoastalOptŪ UV-VIS-IR 60mm f4 Apochromatic Macro
(2) CoastalOptŪ UV-VIS 105mm f4.5 Apochromatic Macro
(3) Tochigi-Nikon 105mm f4.5 UV Lens

If anyone is really interested in UV photography with Sony cameras, I can share my limited experience in a separate post in few days.

Alex
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Post Options Post Options   Quote groovyone Quote  Post ReplyReply Direct Link To This Post Posted: 07 November 2010 at 02:23
I haven't tried any MC/MD lenses. I am still debating converting a NEX-5 which would let me shoot IR with just about anything. I also still need to try my 24/2 on the A100IR. I haven't even tried it on my NEX.

My friend has the new 50/1.8, 35/1.8 and 30/2.8 Macro. I'll have to see if we can test those.

The Minolta 24/2.8 RS works so well it is rarely off the A100.

Edited by groovyone - 07 November 2010 at 02:23
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Bass View Drop Down
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Post Options Post Options   Quote Bass Quote  Post ReplyReply Direct Link To This Post Posted: 07 November 2010 at 02:27
Alex H - that is excellent, thank you!

All my searches for UV photography have brought up Nikon related material, thus far. I am aware of some of the lenses you mention - the Novoflex is of particular interest.

I am very interested in your UV photography and any information / techniques you have for 'A'mount, so I would like to see your thread! Please let me know. I also think sticky threads on IR and UV photography would benefit the Dyxum and 'A' Mount community.   

I have recently purchased a custom flashlight housing a Nichia NCSU033b LED (365nm) and want to explore photography with it, among other things. I am only at the very beginning of a journey to learn, so any information is appreciated (such as your post above - thanks again)

MB
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Alex H View Drop Down
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Post Options Post Options   Quote Alex H Quote  Post ReplyReply Direct Link To This Post Posted: 07 November 2010 at 02:35
Originally posted by Bass Bass wrote:

Alex H - that is excellent, thank you!

I will do what I can, but let us keep this topic "on-topic".
Alex
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Bass View Drop Down
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Post Options Post Options   Quote Bass Quote  Post ReplyReply Direct Link To This Post Posted: 07 November 2010 at 02:37
Thanks also groovyone! Your reply came up whilst I was typing mine.

From what I haave read the Nex-5 gives surprising good results with IR after a full spectrum conversion (my understanding was that CCD was preferable to CMOS?)

I's be keen to know how you get on.
MB
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