hasselblad Fri, 30 Jan 1998 Volume 1 : Number 85 In this issue: Re: hasselblad V1 #84 more on film back leaks Re: Hasselblad Lens Guide - Update Re: more on film back leaks HUG. An interview with the President of Victor Hasselblad AB Re: Re: hasselblad V1 #84 Re: Hasselblad Lens Guide - Update ---------------------------------------------------------------------- Date: Thu, 29 Jan 98 08:52 MST From: sog@rmi.net (Stephen O Gombosi) To: hasselblad@kelvin.net Subject: Re: hasselblad V1 #84 Message-ID: >Different glasses, of differing refractive index, require different coating types for a >number of reasons. Crystal based elements (most ED/LD glasses are flouride dipped >but don't have the refractive power of pure grown crystal elements) like those of the >UV-Sonnar and Superachromats) don't hold coatings well at all and are single coated >instead. Well, this depends on where these elements occur in the design. If they're an internal part of a cemented group, it doesn't matter. If they have an air-glass surface, it does. My main quibble was with the statement that the 250 Sa was optimized for a narrow range of wavelengths, when the opposite is in fact the case. However, I decided to call Hasselblad USA and settle the matter. I spoke to a gentleman by the name of Mark Brittig (I hope I'm not mangling his name too badly). He told me that the 250 Sa is not T* coated, but the new 350 Sa CFE *is*. I have no idea why one is multicoated and the other is not. The 500mm Apo-Tessar also has LD/ED elements, yet it is T* coated. >Another problem with conventional coatings is that the coatings themselves >pass/block specific wavelengths of light and would cause problems for photographers >who would employ the lens for use in those specific wavelengths. > This might well be a problem for the UV Sonnar, since it transmits wavelengths not normally transmitted by optical glass, but I doubt if this is a problem with the Sa lenses. They don't transmit anything that normal optical glass doesn't transmit (visible and near-IR), they just focus it all to the same plane. If this were a problem, then the 350 Sa wouldn't be T* coated, either. >Hasselblad would probably call the SA's T* coated because some of its elements are >probably coated normally but The front set almost certainly is not. In the case of the >UV-Sonnar which is 100% grown crystal in the glass; I doubt that it is coated at all. I think it's single-coated, but I'm not sure. I should've asked, but I didn't want Mark getting excited at the prospect of selling a $15K (or is it $20K these days?) lens. ;-) Steve ------------------------------ Date: Thu, 29 Jan 1998 10:11:04 -0700 From: Andy Peters To: "'Hasselblad List'" Subject: more on film back leaks Message-ID: <01BD2C9E.359787E0@shootingstar.tuc.noao.edu> I mentioned in a recent post about how one of my 12 backs leaks light. = Here's an update... I had developed a roll of film and noticed that I had some light leaks. = These light leaks only occur if the shot was taken outdoors in daylight = - flash pictures are not affected. I looked at the negative a bit = closer and noticed that there were two little "notches" on one side of = frame. I opened up the camera bag, pulled out one of the two backs and = saw matching notches. A-ha! That must be the bad back, so I put it = aside. I shot some more things (mostly indoors with flash) and just recently = shot some outdoor things. And the light leak is back! So I looked = closely at BOTH film backs and noticed that BOTH of them have IDENTICAL = notches in the side. Does anyone know what these notches are for? Additionally, the light leak doesn't start from the side of the frame = where the darkslide enters the back (as I said before) - it starts on = the other side. Closer inspection also reveals that one of the backs = has a little gap between the where the outside shell of the back meets = the inside. Perhaps light is leaking through there? In any event, later today or tomorrow I'm going to load both backs, take = the camera outside and shoot two rolls of pictures of the saguaro that's = across the street from my house, develop the film and get to the bottom = of this. And send BOTH backs in to get repaired. Andy Peters Senior Electrical Engineer National Optical Astronomy Observatories 950 N Cherry Ave Tucson, AZ 85719 internet: apeters@noao.edu voicenet: (520) 318-8191 faxnet: (520) 318-8303 pagenet: (520) 446-2557 sneakernet: Room 208 ------------------------------ Date: Thu, 29 Jan 1998 12:32:09 -0600 From: Bill Grimwood To: hasselblad@kelvin.net Subject: Re: Hasselblad Lens Guide - Update Message-ID: <3.0.32.19980129123207.006f534c@garply.com> Thanks for this wonderful guide to Hassy lenses. I have only been using Hassy's about a year and have bought several books but still had many unanswered questions. Your guide answered all, I mean all, my questions. Your generosity and hard work is greatly appreciated. Bill ------------------------------ Date: Thu, 29 Jan 1998 11:10:10 -0800 (PST) From: Eric Armstrong To: "'Hasselblad List'" Subject: Re: more on film back leaks Message-ID: Hi Andy - the notches are standard on all backs. there were some posts in the really early days of this listserv where people discussed cutting additional notches into their backs so that each was unique in it's notch layout....so any fogged film could be immediately traced to the offending piece of equipment... hth, -Eric On Thu, 29 Jan 1998, Andy Peters wrote: > I mentioned in a recent post about how one of my 12 backs leaks light. Here's an update... > > I had developed a roll of film and noticed that I had some light leaks. These light leaks only occur if the shot was taken outdoors in daylight - flash pictures are not affected. I looked at the negative a bit closer and noticed that there were two little "notches" on one side of frame. I opened up the camera bag, pulled out one of the two backs and saw matching notches. A-ha! That must be the bad back, so I put it aside. > > I shot some more things (mostly indoors with flash) and just recently shot some outdoor things. And the light leak is back! So I looked closely at BOTH film backs and noticed that BOTH of them have IDENTICAL notches in the side. Does anyone know what these notches are for? > > Additionally, the light leak doesn't start from the side of the frame where the darkslide enters the back (as I said before) - it starts on the other side. Closer inspection also reveals that one of the backs has a little gap between the where the outside shell of the back meets the inside. Perhaps light is leaking through there? > > In any event, later today or tomorrow I'm going to load both backs, take the camera outside and shoot two rolls of pictures of the saguaro that's across the street from my house, develop the film and get to the bottom of this. And send BOTH backs in to get repaired. > > Andy Peters > Senior Electrical Engineer > National Optical Astronomy Observatories > 950 N Cherry Ave > Tucson, AZ 85719 > internet: apeters@noao.edu > voicenet: (520) 318-8191 > faxnet: (520) 318-8303 > pagenet: (520) 446-2557 > sneakernet: Room 208 > > > ---------------------------------------------------------------------- > > The Hasselblad Users Group Listserv is a public service of Absolute Internet, Inc., which is not responsible for its content. > > This mailing list is in no way affiliated with Victor Hasselblad AB, it's subsidiaries, or affiliates. > ---------------------------------------------------------------------------- Eric Armstrong e-mail: ---------------------------------------------------------------------------- ------------------------------ Date: Thu, 29 Jan 1998 21:22:38 +0100 From: Håkan Gunnarsson To: hasselblad@kelvin.net Subject: HUG. An interview with the President of Victor Hasselblad AB Message-ID: <34D0E50E.5A93@mailer.student.gu.se> G=F6ran Bernhoff who was appointed quite recently as the president of Victor Hasselblad AB was interviewed in G=F6teborgs Posten, the second largest newspaper in Sweden, the 24th of October 1997. I thought it might be of interest to this forum. The interview was performed by Stephan L=F6vgren. My translation. *** 'HASSELBLAD TAKES ONE STEP BACKWARDS - CONTROVERSIAL PRESIDENT CHANGES THE COURSE: Hasselblad drops the development of digital products and concentrates on conventional technique /.../ 'Hasselblad has, outside Japan, approx. 25 procent of the market of medium-format cameras. The owners intend to keep and improve this position on the market. G=F6ran Bernhoff was appointed as president of Hasselblad at the fourth of July. /.../ After the sudden resignation of Hasselblad's previous president, it was - so the rumours had it - due to the owners', the Swiss bank UBS, intention to settle the development of digital products. Now that has been accomplished, but G=F6ran Bernhoff does not agree with the those who are saying that he was appointed as president along with a particular assignment.' "I was involved in the process to formulate a strategy. I was invited to the board when UBS came in as owners" 'G=F6ran Bernhoff was thus involved in Hasselblad's future more than a year before the day of his appointment as president. /.../ [About the fact that Hasselblad is a reputable trademark...] But this does not suffice; and it is in this connection that G=F6ran Bernhoff comes in. About a hundred people have had to leave Hasselblad in the painful process of cutting production costs and changing the course of product development. Half of them were offered retirement or jobs at Hasselblad's subcontractors, while the rest were fired. Now G=F6ran Bernhoff has to encourage those who are left to look to the future with confidence although Hasselblad has taken a step backwards in terms of product development.' "It would be wrong so say that everyone think this this has been great. A lot of people have got into difficulties; but I think that those who are still with us are very motivated..." /.../=20 'There has been some speculation going on such as UBS' strategy from the beginning was to make a short-term increase of the returns and then launch it on the Exchange.' "That's not true," G=F6ran Bernhoff says, "that would be disclosed internally in the company and externally by the market. I'm confident that UBS is concerned that all will turn out well for the company." 'And it will turn out well, G=F6ran Bernhoff says, by going in for a future where the traditional film takes the main part.' "It's not true that we have quitted the development of digital products" G=F6ran Bernhoff says. "We used to spend a lot of assets on this, but we hadn't enough resources. Instead we are a part of the development by the cooperation with other companies." "We are now focusing all our efforts on the conventional photography. We are at a risk of loosing competence there and that's something we could never afford. We must be forerunners." /.../ "Hasselblad is an excellent camera, but that that does not put it above all matters of price. If you look back some ten years of time, there was a kind of divine aura about Hasselblad. But now our competitiors are getting better and better. We are subject to the changing winds of the market as everybody else." 'The production costs must be reduced, but that must not have any impact on the quality.' "If we loose on this point, we'll loose it all. There we cannot make any compromises." /.../ "There's an increasing concern for quality, and I would not be surprised if this is going to increase the interest in medium-format cameras." ' H=E5kan Gunnarsson G=F6teborg, Sweden ------------------------------ Date: Thu, 29 Jan 1998 16:14:41 -0500 (EST) From: RBucha7924@aol.com To: hasselblad@kelvin.net Subject: Re: Re: hasselblad V1 #84 Message-ID: <980129161440_-1230826251@mrin51.mx> Actually, from a post about two years ago, it was discovered that coating all elements was critical for optimum light transmission. This applied to those elements whose faces were cemented together. -Rick ------------------------------ Date: Thu, 29 Jan 1998 18:41:19 -0800 From: Dave Munroe To: hasselblad@kelvin.net Cc: dmunroe@popmail1.vcd.hp.com Subject: Re: Hasselblad Lens Guide - Update Message-ID: <34D13DCF.5920@vcd.hp.com> > > Thanks for this wonderful guide to Hassy lenses. I have only been using > Hassy's about a year and have bought several books but still had many > unanswered questions. Your guide answered all, I mean all, my questions. > > Your generosity and hard work is greatly appreciated. Thank you, Bill, I appreciate the feedback. It's been a fun project and I hope to have a Web version soon. Funny that when I first started it, I thought it would take a day or two of my time! regards, -Dave ------------------------------ End of hasselblad V1 #85 ************************ ---------------------------------------------------------------------- The Hasselblad Users Group Listserv is a public service of Absolute Internet, Inc., which is not responsible for its content. This mailing list is in no way affiliated with Victor Hasselblad AB, it's subsidiaries, or affiliates.