photoni Posted October 22, 2021 Share Posted October 22, 2021 I would like to share a little test, at sunset, Sony A7 with Pinhole - fullspectrum and my usual Lens Nikkor-H 50 f2 end filters, the last with the ZWB2 taken off the 365nm flashlight. . the white balance was done with Photoshop's Camera Raw by correcting the individual RGB curves by eye . the oak leaves are white with powdery mildew . Thanks Toni . . . Link to comment
Andy Perrin Posted October 22, 2021 Share Posted October 22, 2021 What are you working to determine here? I am not sure what the aim is, so not sure how to evaluate the success? Link to comment
photoni Posted October 22, 2021 Author Share Posted October 22, 2021 36 minutes ago, Andy Perrin said: What are you working to determine here? OK Andy, the test is not clear I was not looking for a result. definitely missing the right light and markers it's just my first UV test (minimal) then ... I wanted to use these filters with pinhole, but the times were too long Link to comment
Andy Perrin Posted October 22, 2021 Share Posted October 22, 2021 Yes, I think UV pinhole photos are on the order of minutes and that is when there is full sunlight. (Not at such ISO levels though.) OlDoinyo did some? Link to comment
dabateman Posted October 22, 2021 Share Posted October 22, 2021 That Bg39 image is the sharpest pinhole image I have ever seen. That Zwb2 + bg39 shouldn't look like that. Something is wrong. Film isn't sensitive to IR, so the BG39 shouldn't be needed. But that is not a UV photo. Link to comment
Andy Perrin Posted October 22, 2021 Share Posted October 22, 2021 26 minutes ago, dabateman said: That Bg39 image is the sharpest pinhole image I have ever seen. That Zwb2 + bg39 shouldn't look like that. Something is wrong. Film isn't sensitive to IR, so the BG39 shouldn't be needed. But that is not a UV photo. Only the first one (full spectrum) seems to be pinhole, since the others say 50mm F/8 (which cannot be a pinhole if true). I think all are digital, none are film? And the colors are altered by hand so we can't interpret by the standard white balance. Link to comment
Cadmium Posted October 23, 2021 Share Posted October 23, 2021 The Zwb2 + BG39 seems to have visual colors mixed in the foliage. Just how it looks to me. Otherwise, the foliage should be black or dark gray with no colors. Link to comment
photoni Posted October 23, 2021 Author Share Posted October 23, 2021 9 hours ago, dabateman said: That Bg39 image is the sharpest pinhole image I have ever seen. I corrected the title, only the first image is with pinhole All were made with Sony A7 f.s. 2 hours ago, Cadmium said: The Zwb2 + BG39 seems to have visual colors mixed in the foliage. Just how it looks to me. Otherwise, the foliage should be black or dark gray with no colors. yes there are many problems, I shot freehand and with auto-ISO. the sensitivity is too high and the photo is underexposed. Link to comment
Andy Perrin Posted October 23, 2021 Share Posted October 23, 2021 Photoni, it’s hard to say but I’m not sure there is enough blocking of visible - what are the thicknesses of the BG39 and ZWB2? Link to comment
Cadmium Posted October 24, 2021 Share Posted October 24, 2021 What is the thickness of (all) these filters? Link to comment
photoni Posted October 24, 2021 Author Share Posted October 24, 2021 Andrea... please, cancel this topic Link to comment
dabateman Posted October 24, 2021 Share Posted October 24, 2021 The pinhole with bg39 is the sharpest. Interesting. I like the 25A and IR ones best though. Link to comment
photoni Posted October 25, 2021 Author Share Posted October 25, 2021 On 10/23/2021 at 5:02 PM, Andy Perrin said: Photoni, it’s hard to say but I’m not sure there is enough blocking of visible - what are the thicknesses of the BG39 and ZWB2? . On 10/24/2021 at 3:37 AM, Cadmium said: What is the thickness of (all) these filters? . BG25 (Jena glass) and ZWB2 (of the 365 torch) are 2mm BG39 (PRC) I have not disassembled it from the ring but it seems to me 1mm . . 9 hours ago, dabateman said: The pinhole with bg39 is the sharpest. Interesting. I like the 25A and IR ones best though. . I will open a new, more complete topic Link to comment
colinbm Posted October 25, 2021 Share Posted October 25, 2021 This is not a filter name that I am familiar with, is it a special Schott filter ? Link to comment
Andy Perrin Posted October 25, 2021 Share Posted October 25, 2021 Yeah, 1mm seems very thin. Probably inadequate blocking on that one. Link to comment
photoni Posted October 26, 2021 Author Share Posted October 26, 2021 23 hours ago, colinbm said: This is not a filter name that I am familiar with, is it a special Schott filter ? ¿ 25A ? is an old vivitar filter around 580nm 14 hours ago, Andy Perrin said: Yeah, 1mm seems very thin. Probably inadequate blocking on that one. to complete my drawer I should order of cheap Chinese filters all diameter ø 52, all 2mm thick QB-39 (BG39) QB-21 (BG38) QB-29 (BG25) ZWB-1 (UG11) ZWB-2 (UG1) ZB-2 (BG3) and an IR 850nm Link to comment
colinbm Posted October 26, 2021 Share Posted October 26, 2021 Looks Good Toni But you shouldn't get into using the equivalents, because they are not & the Chinese graphs are too optimistic. Just stick with the Chinese names / numbers & well know what you are using. Link to comment
photoni Posted October 26, 2021 Author Share Posted October 26, 2021 43 minutes ago, colinbm said: Looks Good Toni But you shouldn't get into using the equivalents, because they are not & the Chinese graphs are too optimistic. Just stick with the Chinese names / numbers & well know what you are using. yes Colin, I guess :-))) that's enough for me. I am more interested in a Petzval 14 inch - 350 mm in europe it costs one kidney Link to comment
colinbm Posted October 26, 2021 Share Posted October 26, 2021 You are old enough to enjoy your children's inheritance. Link to comment
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