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    Re: For existing members who didn't get an email

    I'm afraid I've just noticed that the general password has been posted again in that thread - http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=00GOzo&tag=200605150805 - the post from Pico...
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    Re: For existing members who didn't get an email

    Yes - I've since checked my Yahoo Bulk folder and it turns out that's exactly what happened for me too. Pity I didn't think of it in the first place. I haven't been sleeping too well lately - that's...
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    Re: New format is excellent

    I'd better add my thanks. I'm generally a bit of a curmudgeon about forum software, preferring things as simple and as much text-based as possible - a hangover from days when bandwidth was in pretty...
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    Re: For existing members who didn't get an email

    Ah, yes, I didn't think of that possibility. Well, I've changed it now, so there's no continuing problem. Thanks anyway.

    Huw.
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    Re: For existing members who didn't get an email

    I just went there to get the URL (http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=00GOzo&tag=), but I see the relevant post has been deleted, so I guess that's all right now. It was there just a...
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    Re: For existing members who didn't get an email

    I think there may be more to it than that, because I certainly checked my registered address as advised last week and it was fine, but I was one of those who did not receive an e-mail. Then when I...
  7. Peach Blossom Bokeh! Another of my infamous blogs

    I've just noticed I missed a bit out of my post above - the comparison I was talking about with the 360mm Sironar was a 1950s 360mm Imagon, which, IIRC, is only intended for whole plate, but seems to...
  8. Peach Blossom Bokeh! Another of my infamous blogs

    Thanks to the original poster for an interesting comparison. I think a couple of points need to be made about the Imagon, though.

    Firstly, I know this is quite close up (looks like it's about 1:1)...
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    Stiff film loading on Technika

    I get it with my Technikardan, but it never happened with my Technika IV. Now that I'm aware of it I've just learned to double check the seating of the film holder - a quick tug of the problem end...
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    Wide angle lenses

    I'd go further, and say that my use of different focal lengths varies quite a lot from time to time. Overall, I have a definite preference for wide angles. Until a few weeks ago, the wider end of my...
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    Rodenstock lens data on web

    As Emmanuel says, there's a lot of old information that would be great to have available, but I notice also that in the PDF files, Linos are typically providing MTFs and other performance charts for...
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    Rodenstock lens data on web

    Ah! I guess I would have stood more of a chance of finding that if I'd known that I needed to look on the Linos website and not Rodenstock. Oh well, live and learn. :-)
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    Rodenstock lens data on web

    Well, I certainly account for a good few of those downloads, and I'm just grateful that they heve been available at all. I'd hope, Paul, that if the bandwidth costs aren't too substantial you might...
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    Focusing Knob on TK45S

    I've just checked my own (recently acquired, but used) TK45s and it too gets stiffer (the focussing mechanism) as the rear standard is swung. However, the change is fairly small, and even swinging...
  15. POLL: do you use back movements on your Technika?

    a.

    As with Scott, that's the reason (well, one of them) why I have just bought a Technikardan, though I haven't sold my Technika yet (not sure I can bear to).
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    Ebony 8x10 fresnel users?

    I put an Ebony Fresnel on my Technika IV to replace the original, which was broken, and it's good enough, as Fresnels go. Certainly it's much brighter than the original plain ground glass. It seems...
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    What Lowepro backpack for my 4x5?

    A Pro Trekker AWII for a very similar kit (a couple more lenses, but otherwise much the same). There's room to spare though - you might well manage with the next size down. I usually have room to...
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    WELCOME TO THE LARGE FORMAT FORUM

    Yes, a very big 'thank-you' from me too to those who have made this possible. LF photography just hasn't been the same these last months.
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    The Worst Advice (in ANY format)

    I guess this is a slight departure from the topic - not so much advice as commen t - but I read the following in a review article in an increasingly popular UK p hotography magazine today:
    ...
  20. Depth of Focus ... related to focal length or not?

    Thanks Wayne - I know exactly what you mean! :-)

    And thanks to Bill too - I'm relieved that there was no permanent offence.
  21. Depth of Focus ... related to focal length or not?

    Hmmm. Reading it again, my apology doesn't sound entirely adequate - perhaps I had better explain further.

    I've read a lot of posts on forums such as this that have rubbished theoretical answers...
  22. Depth of Focus ... related to focal length or not?

    I'm sorry Bill - I didn't intend it to come across like that. I'll try to be mor e careful how I express myself in future.
  23. Depth of Focus ... related to focal length or not?

    Oops! My last reply was composed before I had seen Thilo's clarification, and so looks somewhat strange now. There's no equivocation any more.
  24. Depth of Focus ... related to focal length or not?

    I think we're now getting into the realms of equivocation - if we weren't there already.

    You could indeed say that depth of focus is related to focal length if you are speaking in the context of...
  25. Depth of Focus ... related to focal length or not?

    ' Almost everyone can see from diagrams and drawings that wide angle lenses require much more precision in film flatness and the paralellness of the standards. '

    In that case 'almost everyone'...
  26. lightmeter discrepancies Seconic 508 vs Minolta

    One thing to bear in mind with this sort of comparison is that the colour sensitivity can vary between different meters.

    I use a Sekonic L718 and a Minolta Spotmeter F, and with a grey card the...
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    THE FUTURE OF THIS FORUM - PLEASE READ

    Like many so far, I too would have to vote for Photo.net, albeit reluctantly. I remember the MFD back in its early days, when it was just a mailing list, and to be honest I don't think its...
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    Bellows Extension calculation

    Yes, that all looks right now. As others have suggested there are any number of ready-reckoning methods and devices you can buy, but you've picked the same method I used when starting out with a...
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    Bellows Extension calculation

    My apologies - I typed the above message too quickly. The 'log(2)' should of course have been log(sqrt(2)), where 'sqrt' means the square root.
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    Bellows Extension calculation

    Well something is not quite right here - there is no way that 13" of bellows extension on a 12" lens should require an exposure increase of more than 1/2 stop. On the other hand at various points...
  31. focal length comparison between 35mm, 120, and 4x5.

    My apologies - I guess to direct someone to the archives and then concede that some of them are wrong is a bit daft!

    For the record, the technically correct way of calculating exposure ...
  32. focal length comparison between 35mm, 120, and 4x5.

    This seems to be a question about exposure compensation for bellows extension, rather than equivalent focal lengths. The questioner is confused - the exposure compensation has nothing at all to do...
  33. View Camera magazine article - Seeing in Silver

    I normally avoid digital/analogue discussions like the plague, but I couldn't resist the urge to turn off those bold italics!

    </i></b> </i></b> </i></b> </i></b> So, having done that, I may as...
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    Lighting -- What am I doing wrong?

    Jennifer, the standard optical formula relating focal length(f), subject distance(u), and bellows extension(v) is 1/f = 1/u + 1/v [put another way, that is u = fv/(v-f)]. That is for a 'thin' lens,...
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    Lighting -- What am I doing wrong?

    Are you sure about that bellows extension? Unless your 210mm lens is a telephoto then 220mm of extension should get you into focus at around 4.5m or 15ft. That doesn't sound like a table-top shot...
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    Horseman 450 4x5

    I've got a 450 and, as far as I can see from the specifications on the Horseman web site, it appears to be identical to the LE. It's an excellent monorail, and unless you want yaw-free movements I...
  37. Thread: Infinity

    by Huw Evans
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    Infinity

    But, Pete, it is true! Actually I don't think we're likely to be in genuine disagreement here, because I know that you know the optical formulae as well as I do, but I think we're talking about it ...
  38. Thread: Infinity

    by Huw Evans
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    Infinity

    Well, everyone has their own quick and easy way of getting the answer. Then again, if you use a lens regularly enough it shouldn't be too long before you can estimate the compensation well enough...
  39. Thread: Infinity

    by Huw Evans
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    Infinity

    Generally speaking, you're right. An ordinary lens brings light from an infinitely distant source to focus at a point about one focal length behind it. I say 'about' because strictly speaking this...
  40. Thread: help

    by Huw Evans
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    help

    Well I more or less agree with everyone else (not about the atheism/deism/animism - I'm definitely a Christian). There is always another process you can try, or subject field you can tackle - but ...
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