UV, IR, VIS and UV/VIS, Tasmania visit 2020

[Andy Perrin]

I love the hazy UV mountains

[dabateman]

Great images. There looks to be fat bush above the w and n in Queenstown. Using that to visibly align, it seems to To is either a Too or the o was moved over time. Its not more stricking in the UV, so if it is TiO, then the paint always had it.

[JMC]

We're back in the land of email and internet again. We've got back from a few days down in the Southwest National Park. No road access, we fly from Hobart (taking about 50mins), to an airstrip at Melaleuca, where we were collected and went to a boat (the Odalisque) where we stayed for a few days.

 

One of the trips we did was to take a small dinghy to Spain Bay, and then walk overland to Stephens Bay. I'm struggling to find a map for this, but this is the best link I can find to show where we were;

 

http://www.bonzle.co...&p=38403&cmd=sp

 

The area itself is amazing. There are aboriginal middens going back thousands of years at the edge of the beach.

 

I took the camera gear and tripod, and got a set of three images (UV, Vis and IR) along the beach pointing roughy south east.

 

Camera was a multispectral EOS 5DSR, lens the 85mm Ultra Achromatic Takumar. ISO400 and f16 for all images. UV with Baader U, Visible with BG39 (2.5mm, chinese copy) and B+W486 UV/IR cut, and IR with Hoya R72. Images saved as monochrome in the camera, but I got RAW files and raws of a PTFE disk to do more work on them when I get home. Weather was cloudy unfortunately when I took these 3.

 

UV - 1/2s

 

Visible - 1/100s

 

IR - 1/125s

 

Unfortunately with the dull weather at the time, there is not the usual back sky in the IR image. However later in the day I got this IR image at the north west end of the beach (looking west). Again the EOS 5DSR multispectral, but this time with a Canon 17-40mm zoom (at 17mm) and a Heliopan 715 filter.

 

[Cadmium]

Jonathan, Very nice shots!

[DaveO]

Great images Jonathan,

 

I hope somebody told you before you went that Tasmania is very addictive so you will always be yearning to go back. My first trip was in January 1968 to climb in Pine Valley at the top end of Lake St Clair. Tassie has a different scale of weather to the mainland, your cloudy days were good by their standards. Try horizontal sleet at sea level on the West Coast (that was 1972) at Christmas.

 

Enjoy it all

 

Dave

[JMC]

Thanks Dave. Yes it's our 4th visit, with hopefully more in the future. Yeah, the weather is crazy, we had everything from high temps and sun to driving rain and high winds within a couple of hours in Stephen's Bay.

[DaveO]

Jonathan

 

When you are home again you could try finding this

 

https://en.wikipedia.org/wiki/The_Peaks_of_Lyell

 

and several novels by Richard Flanagan starting with Death of a River Guide

 

to get another side to Tassie

 

Dave

[JMC]

Thanks Dave.

[Andrea B.]

Hello Jonathan! What a wonderful vacation you are having in such a beautiful place. Thank you for showing us these lovely UV and IR images. The scenery is quite spectacular.

 

Keep 'em coming!

 

I was thinking that the most recent UV image would look quite interesting in a panoramic crop of 3:1. Try it sometime when you have time and let me know what you think.

[Guest]

@JMC: That last shot you posted above, is great! So ominous, almost biblical.

[JMC]

Thanks all. Holiday almost at an end now :( but I managed to get another couple of sets of UV, Vis and IR, landscapes which I'll put up when I can.

[Andrea B.]

BTW, it is nice to see that UAT used on vacay!

[JMC]

Andrea, the UAT has it's own little plastic bag, with a silica gel pack in it, which then lives inside the camera bag. I told my wife, if I fall over the side of the boat, and my camera bag goes with me, rescue the camera bag. I've been using it on beaches and in less than ideal weather, and have been a bit paranoid about keeping it clean. However it deserves to be out there being used.

 

Next set of images. These are from the Maingon Bay lookout at Remarkable Cave, looking south west towards the tip of Cape Raoul, which is about 6km away. Images were taken at about 9:30AM. Weather was overcast. Here it is on the map;https://www.google.com/maps/place/Remarkable+Cave/@-43.2093437,147.8014933,13z/data=!4m5!3m4!1s0xaa6daf09bfd07bed:0x2856f618979f248d!8m2!3d-43.1872449!4d147.8443818

 

As before, taken on my Multispectral EOS 5DSR, with the 85mm UAT lens. ISO400 and f16. UV - Baader U, Visible - Chinese BG39 and B+W486, IR - Hoya R72. Images saved as RAW and monochrome jpeg in camera. Monochrome jpegs used here.

 

UV - 1s

 

Visible - 1/80s

 

IR - 1/125s

 

The tip of Cape Roaul is amazing to look at. Enormous pillars of dolerite pointing to the sky. Here it is using the 400mm lens.

 

I might rename this thread now, as it has progressed beyond the original Ben Lomond post.

[JMC]

Final post with a set of UV, Vis and IR images. This time from the beach at Safety Cove State Reserve. Parked at the corner of Briggs Road and Safety Cove Road, and then walked down on to the beach. Looking south east along the promontaries of Cape Pillar. Images taken at about midday in bright sunlight.

 

Taken on my Multispectral EOS 5DSR, with the 85mm UAT lens. ISO400 and f16. UV - Baader U, Visible - Chinese BG39 and B+W486, IR - Hoya R72. Images saved as RAW and monochrome jpeg in camera. Monochrome jpegs used here.

 

UV - 1/4s

 

Visible - 1/160s

 

IR - 1/160s

 

Obviously there is a boat in the UV image which isn't there in the others, and a seagull came to investigate in the visible image, which I didn't realise until processing the images.

 

No more sets of images for this trip, however I may have some other IR ones, I need to go back and check.

[dabateman]

Yes birds are only visible in the visible range. We can't see them out side that :)

 

But under cover UV boats are a concern. Maybe you were being followed.

 

Excellent images great to see a UAT in the wild. I don't know where I stand on taking mine out yet. Let alone getting out.

Glad your having fun.

[Stefano]

Interesting to notice that there isn't much difference between UV and VIS (apart from a bit more Rayleigh scattering in the UV image), but there is a big difference between VIS and IR. You can tell that in UV a good portion of the light illuminating the scene comes from the sky and not from the sun itself. The opposite occurs in IR.