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Modern Classic SLRs Series :
Pentax LX - Message Board/Guestbook

Industry wide indications and ceasing film body development by Pentax altogether in early 2003 more than suggest the manual focus Pentax LX will not be having an upgrade (except, perhaps for very rare Limited Edition Models hand assembled by special commission by the new HoyaPentax Corporation). In 2008 Pentax became a division of Hoya Corporation, which had together with Pentax released jointly developed professional grade optics (since 2005); Pentax has shifted its attention to development of auto focus Digital SLRs having build qualities constructed for the long run--now with weather seals--like the LX. You may use this site for common support and sharing of mutual users knowledge or experiences among yourselves. You may also use this message board as a guestbook for the advanced users Pentax SLR cameras from the LX forward, including many such auto focus film cameras, and Pentax digital SLR cameras. We keep the site going too for the WORD SEARCH FEATURE found here as to its magnificent K mount system user archives: as have been shared here for many years. Have an inquiry related to Pentax gear? First try KEYING IN YOUR KEY WORD(S) for a preexisting archived response on your subject of inquiry from this LX site. If your inquiry or sharing is from advanced users K10D, K20D, or K200D SLR needs, proceed on to t NEW PENTAX ADVANCED USERS K10D, K20D SLR site.

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1. From : Jay Hart (ibcom@onebox.com)
Url : http://
Date : 07:59 PM Tuesday 27 January, 2004

Hi Guys, Though I'm in the cold north country of Norge just now, and lack my reference works, I underscore Mico on converters. The greater the multiplier the lesser the depth of field (and, the longer the focal length too the lesser the depth of field from a given camera location). This has to do with the fact that converters generally flatten imaging income by optical formula outcome, and the selection of one will do exactly what Mico has stated. This is in my own experience as well. Generally long lenses have less depth of field anyway. The working tools for increasing depth of field call for going to a wider optic to increase it, distance for distance over any other lens, move further away, close down the lens, and/or select a faster film speed which results in closing down the lens more than a slower film speed. I hope this is helpful. F 5.6 on a 105mm will give the same amount of light to the film, not the same DOF as a 210mm at F 5.6.

Musicians, know any good clubs in Oslo? --JH


2. From : Anton (handmaid@fsmail.net)
Url : http://
Date : 06:37 PM Tuesday 27 January, 2004

Hmmm, I shall have to do a test then. I know (for sure) that a converter maintains the minimum focus distance of the prime - this is why I chose the Pentax 67 2X over the early SMC Takumar 200/4 (focuses to 3m, nowhere near close enough) and even the highly regarded current SMC 200/4 (focuses to 1.5m, still not really close enough) even though the converter costs more than the early lens and a bit less than the later lens. Also I can use the converter on my 150/2.8 to give me a bit more telephoto effect if I require it. If it affects minimum focus, I can believe then that the converter does something to the depth of field. I don't have a 200 to compare but I might use one in a local shop and do some comparison in viewfinder.

AB

p.s. it's great having such a large negative and that super smooth gradation on skin tones and being able to crop with little loss of quality and my Epson 2450 being able to scan the negative in the hood to good quality (the 2450 can't really do justice to 35mm negs - apparently the later 3200 can)....


3. From : Mico (micolx@netscape.net)
Url : http://
Date : 12:49 PM Tuesday 27 January, 2004

Anton, me again. Well,I have a bit different opinion on that.
So, 250/5,6 prime lens wide open should have much more DOF than 105/2,4 + 2X converter which makes effective 250/5,6. Like Ian, I also did not check books for years but this is my on the field experience. Many years ago,I worked with SMC-M 200/4 + Pentax 2X converter which made it effective 400/8. There was not DOF at all, so any F5,6 or even F4,5 400mm prime had way more DOF wide open than that combo at F8. Same story with SMC-K 200/2.5 + converter. Recently, I have been working with F*300/4.5 + Pentax 2X and Sigma 1.4X. Again, VERY limited DOF at 600/9,5 and 420/6,7. M.


4. From : Ian (ian@ity.co.uk)
Url : http://
Date : 09:53 AM Tuesday 27 January, 2004

Anton, my guess is 210 at 5.6 DOF is the same either way (as you suggest). I have not done lens theory since 1984, I forget. I can't see that grain is an issue at all (regarding optics). But, all optical errors, aberrations, will be amplified. And as you mention, loss of resolution is not an issue for your portraiture (within reason).- Ian.


5. From : Anton (handmaid@fsmail.net)
Url : http://
Date : 08:04 AM Tuesday 27 January, 2004

Mico - and everybody. Sorry to extend this but...

My question (and maybe the answer is obvious) is: Does a prime lens 210mm shut down to f5.6 have the same depth of field as a prime lens wide open with 2X converter that makes an equivalent of 210mm at f5.6? I imagine the depth of field would be the same but I don't know the physics. With this setup I don't want grain (that was with the LX in the studio) the slight loss of resolution (I'm using a beautiful Pentax 67 2X converter) is not a problem as I'm shooting portraits... it's probably an advantage... I often use a Carl Zeiss Softar II filter on top of this setup. I shall do some experiments with a ruler (oo-er missus) - that's a UK/Frankie Howard thing - and report back.AB


6. From : Mico (micolx@netscape.net)
Url : http://
Date : 02:29 AM Tuesday 27 January, 2004

Anton, let`s put it this way: if you compare your 105/2.4 alone, wide open, and than with the 2X converter, wide open (making if effective 210/5.6) final result is less DOF with the latter combo. Also, 105/2.4 stopped down to F5.6, compared to the same + converter (making it effective 250/11) also has less DOF with the combo. Converter,in general,leads to less DOF, and no matter how good it is,reduces overall lens resoluton. For some reason, film grain tends to pop-up (good in your case). To get optimum results, only high quality primes should be used with converters. And 1.4X ones are usually better performers. Hope I was not too confusing this time. M.


7. From : Anton (handmaid@fsmail.net)
Url : http://
Date : 11:40 PM Monday 26 January, 2004

Hi Globetrotter, this (PDF) is the best jazz listing for London, hope you find something to your tastes. http://www.jazz-live.info/JIL/JILfrontpage.htm

Mico, I don't quite understand your response. If I have a 210mm f2.0 prime lens stopped down to f5.6 and my 105mm f2.4 with 2X converter wide open (making a 210mm f 5.6) will the depth of field be the same for both lenses? I guess I'm being lazy, I could run some tests. AB


8. From : GLOBETROTTER (globetrottterworld@hotmail.com)
Url : http://globetrotterworld.co.uk
Date : 09:17 PM Monday 26 January, 2004

Just returned to UK after trips to Spain, Holland & Germany. I've got two weeks to catch up on work, and then need to drive back to Holland for a major two-day show, to launch my new book.

Nice to see the LX still working in those freezing temperatures in Quebec...last time I was using my LX's in Quebec, Canada was having a rare heatwave! I see by the news that Montreal is suffering from severe low temperatures at the moment. Wear gloves,...and be careful your skin doesn't stick to the back of your camera!

Anton, can you help with some information? - My girlfriend, Chez, is hankering for a good night-out listening to some live music. Any good jazz nights to go to over the coming weeks/months? I see by your website that most are held during the week. Are there any held during weekend evenings?


9. From : Ian (ian@ity.co.uk)
Url : http://
Date : 08:48 AM Monday 26 January, 2004

Just back from Brighton/France (and an hour in Belgium). A Tri-X awaits processing. Yes, my LX is back from repair. Nice job, they claim to of done just about everything. I'm impressed so far. Nice one PJ's, and Jessops. Mirror lock now works perfectly. Managed to pick up an A-Series 50mm f1.7 and a 280T Flash gun just before I went to Brighton. I love those 1.7's (I'm assuming it's the same optics as the M verison), wonderful for shooting wide open (they remain sharp).

Anton, nice to hear your going to try some Tri-X. Go for it! I think you'll love it. Although I'd be tempted to use T-Max 3200 in the conditions you describe. I'm going to put some 3200 through soon and see how it is in HC110. If you do your Tri-X in HC110 (@400asa), 6 mins max (20c). I love the combination myself. Watch out for excessive contrast though. One stop push (800), at 6 mins would be fine (I'm talking "new" Tri-X btw). - Ian.


10. From : Mico (micolx@netscape.net)
Url : http://
Date : 01:30 AM Monday 26 January, 2004

Anton, your lens with converter will have skin-deep DOF, wide open. This is a general rule for converters, so, regarding DOF, lens will not act as 250/5,6 ,it could be more like 250/2,0. In particular because it is 2X converter.TRI-X shold give sharp, yet grainy results if you (or the lab)develop the film in slightly warmer chemicals (22C)while keeping correct exposure. Of course, film will be about one F-stop overexposed, but this is my favorite way to get grainy images. M.


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Maintainers for Pentax LX Series SLR Camera Models Message Board:
Tony Davies-Patrick (Globetrotter) (globetrotterworld@hotmail.com); Mico Smiljanic (micolx@netscape.net);
Jay Hart (ibcom@onebox.com); Philip Ashman (genesisphil@hotmail.com)

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