Stefano Posted April 23, 2021 Share Posted April 23, 2021 Other non-specific photos, just something I wanted to share. Camera: Full-spectrum Canon EOS MLens: Soligor 35 mm f/3.5Filter: ZWB2 (2 mm) + Chinese BG39 (2 mm) In some images, I corrected the overexposed areas in IrfanView by replacing the blown-out colors with white. Dog with UV-purple daisies (left), UV-white flowers (unknown, they are magenta in visible light, center) and UV-yellow dandelions (right).f/4(?), ISO 6400, 1/30 s exposure Same flowers, another angle and without dog.f/22, ISO 100, 240.1 s exposureThe f/22 was necessary as I really needed a deep depth of field. I also have a f/11 version. The white flower in detail (another plant, another day, but same flower). I will take a visible reference if necessary.f/11(?), ISO 100, 4 s exposure UV torch with a ZWB2-like filter, and a normal white LED torch. Reference taken with my smartphone (Samsung Galaxy A40). The white torch has a TIR lens (Total Internal Reflection).f/1.7, ISO 40, 1/241 s exposure In UV. f/11(?), ISO 100, 30 s exposure f/11(?), ISO 100, 4 s exposure I can try to see how the Convoy S2+ torch looks like in UV with its 2 mm thick U-340 filter. I expect it to look a bit darker and more greenish. Link to comment
Andrea B. Posted April 23, 2021 Share Posted April 23, 2021 Love seeing the dog in UV !!He is very reflective. Maybe put that one in the Fauna section. We rarely get animals. Link to comment
Andy Perrin Posted April 23, 2021 Share Posted April 23, 2021 Stefano, you can probably raise the exposure a bit using the RAW for those. They seem dark. It is a dark world in UV but it’s possible to brighten a bit in post processing. I like the first 3 photos up top. The flashlights are interesting. Link to comment
Stefano Posted April 23, 2021 Author Share Posted April 23, 2021 I often expose my photos a little under to avoid overexposing. Probably I can raise them by one stop. Link to comment
Andrea B. Posted April 24, 2021 Share Posted April 24, 2021 It is always a judgement call, isn't it? Especially difficult with a very UV-reflective dog. But I would also suggest a bit of a raise in either the camera or the converter. We should be able to make out some UV details, yes? Loving on Sugar! Looks like a sweetie. Link to comment
Stefano Posted April 25, 2021 Author Share Posted April 25, 2021 New images. I tried with the Convoy and, as I predicted, the filter is greener. In some images, I tried to fix the overexposes areas replacing the color with white in IrfanView. f/11(?), ISO 100, 4 s exposure f/11, ISO 100, 4 s exposure. I took several images at different exposures, to be able to make an HDR image in the future like Andy did. f/11(?), ISO 100, 8 s exposure f/11(?), ISO 100, 8 s exposure f/4, ISO 6400, 1/100 s exposure (handheld) Also, I forgot how bright this torch is. It easily outshines the Sun. Ulf showed this once (I will add the link with my phone. I don't know why, but I can't make link words from my PC). Link: https://www.ultravioletphotography.com/content/index.php/topic/2921-in-the-spotlight This was under strong sunlight: f/(?), ISO 800, 1/30 s exposure With the torch a few centimeters from the tile (remember, under early afternoon sunlight on a sunny day!)f/(?), ISO 100, 1/30 s exposure Looks like dust jumped on the sensor again. Cleaning it is a pain everytime. Link to comment
Stefano Posted April 25, 2021 Author Share Posted April 25, 2021 I have it, it helps but sometimes it sprays liquid "air" (it isn't air, but another chemical), and when this happens it leaves some residues and I fear the thermal shock can crack the coverglass (the only glass I have above the sensor). Sometimes I use a very small amount (much less than a drop) of window/glass cleaner and a clean brush (those you paint with, but never used for that of course) and clean the coverglass as best as I can. The very action of using the brush can leave new dust particles, and I have to do everything again... I clean the rear of my Soligor too, because I think that dust can fall from the lens. I always leave the lens mounted, so I don't understand how dust can enter, maybe from the helicoid. Link to comment
Andrea B. Posted April 25, 2021 Share Posted April 25, 2021 good points. I have been tempted to use canned air but will refrain. I once saw a recommendation that before cleaning a sensor, you should run the bathroom shower for a minute or two which - supposedly - settles the dust. Then go clean the sensor in the bathroom. Link to comment
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