DavidStone Posted August 26, 2007 Share #21 Posted August 26, 2007 Advertisement (gone after registration) David - Great shot. Wonderful space, nicely captured. Carsten - The comparison is revealing - it seems to show the 15 CV in a very good light. Yes, at full resolution (100%) it is a wee bit tenderer than the Leica, but wow, how much for how little. Geoff G Thanks Geoff. This is the interior of the relatively new Museum of Modern Art in my local city of Aarhus in Denmark. The CV15 on the M8 seems remarkably free from linear distortion and so far I've not found much vignetting either. But I've also taken some shots at the full 15mm with the lens screwed onto my 1938 Leica III, which could be interesting. A versatile lens. David Link to post Share on other sites More sharing options...
Advertisement Posted August 26, 2007 Posted August 26, 2007 Hi DavidStone, Take a look here Am I Expecting Too Much From My CV15?. I'm sure you'll find what you were looking for!
Jack_Flesher Posted August 26, 2007 Share #22 Posted August 26, 2007 I just can't understand how they can make such a good lens for the price. Well for one thing, it is NOT RF coupled. Not that that is a huge issue given its pretty hefty DoF PS: GREAT shot David -- my compliments! Cheers, Link to post Share on other sites More sharing options...
sean_reid Posted August 27, 2007 Share #23 Posted August 27, 2007 Sean, The CV15 picture was taken at infinity and the licence plate was 11 metres from the lens. Am I to assume the lens won't focus at infinity and it needs attention? No, I would not assume that at all. The important thing to remember is that depth of field is not the same as focus.There's probably nothing at all wrong with your lens but using a non-coupled lens for pictures where one expects very high resolution at a set distance is challenging. It's the same for the Zeiss 15. If you read my review of the ultrawide lenses, you'll see that I carefully focus-bracketed all of the resolution test pictures. The CV 15 shows excellent resolution but it, like any other lens, must be focused exactly in order to do that. Again, the uncoupled Zeiss 15 poses the same challenge. I discuss this whole topic in some detail in that ultrawides article. Cheers, Sean Link to post Share on other sites More sharing options...
ho_co Posted August 27, 2007 Share #24 Posted August 27, 2007 David-- Beautiful shot! I don't blame you for showing off both the image and the new museum! Did you do that handheld or from a tripod? What ISO? It's gorgeous! --HC Link to post Share on other sites More sharing options...
sean_reid Posted August 27, 2007 Share #25 Posted August 27, 2007 Just a few thoughts/reminders: 1) There is no VC. Cosina licensed the brand and so it is CV (Cosina Voigtlander). 2) The 15 is a very good lens but there are other CV lenses that perform as well or better. In other words, the CV 15 (not the VC 15) is just the tip of the iceberg. 3) Any resolution comparison where the samples are not made with careful focus bracketing will only be useful if one is lucky. Focus bracketing is key, especially with non-coupled lenses. 4) The best thing to compare a 15 mm lens to is another 15/16 mm lens. As Carsten pointed out, trying to compare the resolution of lenses that have different focal lengths can be problematic. Cheers, Sean Link to post Share on other sites More sharing options...
sean_reid Posted August 27, 2007 Share #26 Posted August 27, 2007 Not that that is a huge issue given its pretty hefty DoF Hi Jack, It can be an issue if one needs critical focus at a specific distance. One significant advantage the WATE has over the CV 15 and Zeiss 15 is that the former is RF-coupled. Even at 15 mm, that can be important. Cheers, Sean Link to post Share on other sites More sharing options...
marknorton Posted August 27, 2007 Share #27 Posted August 27, 2007 Advertisement (gone after registration) I can understand that the CV 15 is not rangefinder coupled on cost grounds but not the Zeiss 15/2.8, their most expensive M lens by a long way. Is it because the lens is so large that it blocks the view out of the rangefinder window? Link to post Share on other sites More sharing options...
Maggie_O Posted August 27, 2007 Share #28 Posted August 27, 2007 What, if any external viewfinder are y'all using with this lens? Brilliantly fantastic images, y'all!!! Link to post Share on other sites More sharing options...
Fotomiguel Posted August 27, 2007 Share #29 Posted August 27, 2007 Even recognizing that I have not the same strong feelings that with my Leica lenses, I'm very happy with my new CV 15. I try to use it f 5.6 or f 8 and calculate the focus as much as possible. So not to force it to much to get good results. The price is so good! And I couldn't afford any other ultra wide for my M8. Cheers! Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/31938-am-i-expecting-too-much-from-my-cv15/?do=findComment&comment=339172'>More sharing options...
Mauribix Posted August 27, 2007 Share #30 Posted August 27, 2007 ...If you read my review of the ultrawide lenses, you'll see that I carefully focus-bracketed all of the resolution test pictures. The CV 15 shows excellent resolution but it, like any other lens, must be focused exactly in order to do that. Again, the uncoupled Zeiss 15 poses the same challenge. I discuss this whole topic in some detail in that ultrawides article. Cheers, Sean I did it.... and that's why i kept my cv15 instead of tryin' to change it! really great done Sean! regards Maurizio Link to post Share on other sites More sharing options...
Mauribix Posted August 27, 2007 Share #31 Posted August 27, 2007 ...Btw, all were taken at f/8 at ISO 640. At ISO 160 they would have been a little sharper. I also had no IR filter on the CV15, so the colours are a little pinker. Hey Casten, how did you convert this 640? were them DNG?what software and settings did you used to convert?i really see nice detail/sharpness/colour in these images.... regards Maurizio Link to post Share on other sites More sharing options...
TEBnewyork Posted August 27, 2007 Share #32 Posted August 27, 2007 What, if any external viewfinder are y'all using with this lens? Brilliantly fantastic images, y'all!!! I'm using the CV 21mm finder. It can be purchased on its own. It also comes bundled with their 21mm lens but I would read Sean's review for that one before going in that direction. Terry Link to post Share on other sites More sharing options...
toke Posted August 27, 2007 Share #33 Posted August 27, 2007 Hi David, I was there the other day ........:-) Toke Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/31938-am-i-expecting-too-much-from-my-cv15/?do=findComment&comment=339344'>More sharing options...
dspeltz Posted August 27, 2007 Share #34 Posted August 27, 2007 I beleive the CV comes out of the same factory as the Zeiss lenses, with limited quality control for CV. That may explain why the CV lenses are generally so good. Link to post Share on other sites More sharing options...
carstenw Posted August 27, 2007 Share #35 Posted August 27, 2007 Hey Casten, how did you convert this 640? were them DNG?what software and settings did you used to convert?i really see nice detail/sharpness/colour in these images.... regards Maurizio Maurizio, I really didn't do anything special here. DNG, imported to Lightroom, and I think I just hit Auto to set the exposure and everything, that's it. As has been said here recently, the M8 gives very good results, even at ISO 2500, as long as the exposure is perfect. To the Aarhus photographers: smukke billeder! Link to post Share on other sites More sharing options...
Jack_Flesher Posted August 27, 2007 Share #36 Posted August 27, 2007 Hi Jack, It can be an issue if one needs critical focus at a specific distance. One significant advantage the WATE has over the CV 15 and Zeiss 15 is that the former is RF-coupled. Even at 15 mm, that can be important. Cheers, Sean Precisely why I mentioned it in the first place... But for the roughly $3700 (US) price difference, I figure when I need that level of accurcy, I can afford to take the time to review said critical area using the zoom feature on the M8 LCD and adjust focus if necessary. While we are on the subject, it should be mentioned that at f4.5 - 5.6 in the extreme corners of the M8 frame, the Heliar will show a touch of softness. This almost totally disappears by 5.6-1/2, and the lens' sweetest aperture is around f8-1/2. At f8-1/2, there is significant enough DoF to easily cover 2 meters to infinity with very good final resolution throughout that range. No, it may not resolve newsprint at 30 meters, but will be more than adequate for any normal image output. Cheers, Link to post Share on other sites More sharing options...
DavidStone Posted August 27, 2007 Share #37 Posted August 27, 2007 David--Beautiful shot! I don't blame you for showing off both the image and the new museum! Did you do that handheld or from a tripod? What ISO? It's gorgeous! --HC Thanks Howard. I checked back, and it was 1/125sec, rated 320 ISO. Handheld, but carefully lined up to avoid converging/diverging verticals. Can't remember the aperture, but most likely 5.6/8. There's also a convenient parapet from where I was standing, for resting elbows. I'm afraid I can't take any credit for the architecture, but as Toke obviously knows, it's an impressive space. I use the viewfinder that came with my CV21, which gives a slightly tighter crop, like the M8 finder, so allowing a bit of extra around the frame-line works out OK. David Link to post Share on other sites More sharing options...
cliffordjim Posted August 27, 2007 Share #38 Posted August 27, 2007 I've had my CV 15 for 4 years now and it has been used heavily and is quite well traveled. Yesterday the front plate came loose (this is the brand plate) which appears to be glued onto the front of the lens. What type of glue should I use to re-glue it? Perhaps I should leave it off as it gives me a slightly deeper set for the inverted Leica UV/IR cut filter... Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/31938-am-i-expecting-too-much-from-my-cv15/?do=findComment&comment=339658'>More sharing options...
Mauribix Posted August 29, 2007 Share #39 Posted August 29, 2007 Maurizio, I really didn't do anything special here. DNG, imported to Lightroom, and I think I just hit Auto to set the exposure and everything, that's it. As has been said here recently, the M8 gives very good results, even at ISO 2500, as long as the exposure is perfect. To the Aarhus photographers: smukke billeder! Thanks Carsten! really incredible step up since the new firmware, i confirm that! and love lightroom too! cheers Maurizio Link to post Share on other sites More sharing options...
sean_reid Posted August 29, 2007 Share #40 Posted August 29, 2007 I can understand that the CV 15 is not rangefinder coupled on cost grounds but not the Zeiss 15/2.8, their most expensive M lens by a long way. Is it because the lens is so large that it blocks the view out of the rangefinder window? No, it isn't. Link to post Share on other sites More sharing options...
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