Re: cleaning focusing screen / pentaprism
Hi folks, Thanks VERY much for your help in answering my questions! Hugo. = Don't it always seem to go that you don't know what you've got till it's gone - Joni Mitchell. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
cleaning focusing screen / pentaprism
Hello dear people, I'm currently doing a long postponed job, namely exchanging focusing screens between two MX-es. Reasons for postponing are of course the trickiness of the procedure. I know of some of the dangers of touching the screens and such. With pentaprisms I have none experience whatsoever. I'm searching for people who have experience with this dirty job because I'm afraid I screwed things up. What I did is this: Removed screen, parked it in the holder of the plastic screen box. Next I looked through the viewfinder to notice some dusty particles. I thought it to be a good idea to remove these too. So I gently moved a special micro-fibre lens cleaning cloth over the pentaprism. Looking through the viewfinder didn't make me happier, to say the least. I don't know how to describe what I saw; it resembled most a trail of very tiny oily drops. I wonder where these drops come from: the cloth or is was it already on pentaprism? Anyway, not being able to remove the phenomenon I proceeded to place the focusing screen from my other MX in this camera. Looking through the viewfinder made me sigh a little (of relief, that is) because there was no visible trace of the oily substance to be found back on the image in the viewfinder. But still, there were the dust particles. These are annoying and now I localized them to be on the focusing screen and not on the pentaprism. Rubbing with a lens brush did not help; it merely moved the dust from one place to the other. This longwinding story comes to an end now, because I'm nearing my current state of misery; I finally tried to get rid of the dust by using the lens cloth. I gently moved up and down ONCE. And now I can see something that is best described as a trace of liquid. It's not dark but transparant. My question: is there anybody who has done this job before who can provide for some suggestions regarding the whole procedure? Think it would be of help for anyone facing the same situation. One of my questions is for example: what the hell is going on with this special lens cloths? There was no mention of it containing any sort of stuff and I NEVER experienced someting like this (I use the cloth for a considerable time to clean my lenses (front and back). Anyway, Hope you guys have some ideas. BTW: the focusing screen in the above story is a wholly matted one with an extra fine matted centre circle - so no attached focusing aids on the screen.. Yours, Hugo = Don't it always seem to go that you don't know what you've got till it's gone - Joni Mitchell. __ Do you Yahoo!? The all-new My Yahoo! - Get yours free! http://my.yahoo.com
Re: Colour-presentation of Pentax lenses compared to Other Brands
Hi all, there have NO filters been used, just plain camera + lens. Yhe Hardanger Vidda is on 1100-1300 meter height, so there could be a warrant to use skylight. But then again, the results between our two systems should be tending towards the same blue-magenta side of the spectrum. Moreover, scanning slides made backwards in time this same difference is noticed now I've come to this conclusion. I wonder how it is that it occured to me so late in time. The difference IS obvious. It's true that I didn't notice this before and I do realize that the blue-ish representation often is more realistic in my eyes. But I wondered if there were more fellows having discovered this same trend. By the way, what does a skylight filter do exactly and when is the use of it warranted? Is it some kind of UV filter? Thought of the latter that Pentax lenses were coated enough just to leave them be... Thanks for reactions so far, Hugo. = Don't it always seems to go that you don't know what you've got till it's gone - Joni Mitchell. __ Do You Yahoo!? Get personalized email addresses from Yahoo! Mail http://personal.mail.yahoo.com/ - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: MX/LX focussing screen descrepance question
Thanks Seth & Rob for the input. I once was told that the enlargement factor of the fresnel lens was also fractionally different between the MX and LX screens. I know not if the former sentence is ape-bread but to me it sounds like it being possible. What function does the fresnel-lens (or other contraption) exactly have? __ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: metal hoods for 85/1.9 lens?
Thanks for the suggestion, Shel. Hugo. __ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
How to disassemble a Pentax Lens and put it together again
Hi again, another question to check out the Pentax Data Base that is YOU. Situation is: comparing three of my lenses with fixed aperture (let's say: 5.6), the light meter gives on all three of them a different exposure time. That is: 50mm OK, 85mm +1 stop, 135mm +1/2 stop. After extensive comparisons in which all possible other explanations were ruled out, it left me with the only remaining cause: the 'pen' inside the mount of the lens that mechanically tells the camera what aperture is momentarily in use is not in proper place in two of the lenses. Now here's my question: is it possible to open up the rear of the lens myself, adjust the relative position of the 'pen' a little and at the same time be reasonably confident to end up with a working lens? Is there anybody out there who has had a similar problem and/or who has had the guts to rip open one of their lenses? - how did you fare? Maybe it's a good idea for anybody with ambitions to produce an illustrated HOW TO ... guide on internet... Thanks for reading, thinking and reacting, Hugo. __ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: metal hoods for 85/1.9 lens
Sorry for typo, should be heading 85/1.8 of course. __ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
MX/LX focussing screen discrepance question
Hi, Having heard/read about differences in metering properties of respective focusing screens, I would like to ask if anybody can answer this question: what is exactly the exposure compensation to be used when inserting a LX-focusing screen into a MX-camera? And, if anybody has experience in above mentioned screen exchange: are there still other differences that makes my trick less likely to work out properly? Would be greatly thankfull for your comments. Thanks, Hugo. __ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
metal hoods for 85/1.9 lens?
Hi there, does anyone knows of a metal hood for the 85/1.8 K lens. I mean in the style of the metal hood originally manufactured for a Takumar 135mm that fits the 135/2.5 SMC lens. The combination of lastnamed pair works out fine, so I am anxious to know if my restless search for a likewise version for my 85mm is idle cognitive pre-occupation and thrown-away effort or founded goal-directed behaviour. Thanks, Hugo. __ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
