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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.

This LX site was specifically created for the great Pentax LX SLR camera model(s), and now has incorporated increased opportunity for an expanded interchange with the introductions of the Pentax K10D, K20D, and K200D SLRs to include advanced and professional digital user models. Interchange is encouraged with the intention to continue as a forum for advanced system users of past K-mount film based SLR systems and the mentioned Pentax DSLRs. With decreasing forum traffic here, and enthusiasts moving on with SLR digital imaging products futures, we hope the continued convenience of this site and its past Pentax advanced LX users data archives--provided by the database KEY WORD SEARCH FEATURE found here--can be very useful to you. Most past site user techniques, systems components, and lenses of Pentax advanced applications--as have been past examined by users on this site--are still of use regarding the newest Pentax SLRs. Please don't mail us with other than constructive suggestions or to rectify mistakes found within this site, thank you. Since this is a non-profitable resource site, maintained by professional and advanced system users, the developer of this site reserves the rights to censor or delete any inappropriate, unrelated, misleading or excessively hostile messages posted herein. If your intention is to dispose of your Pentax cameras or its accompanying accessories and/or you are looking for a used model, or even for any of its system components: please use a separate section with a higher volume of related traffic for these purposes: on the
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1. From : Ian (ian@ity.co.uk)
Url : http://
Date : 11:13 PM Wednesday 26 November, 2003

Good news. I've got two A35-105/3.5 lenses on there way up for my appraisal. £70 and £120. They should arrive early next week. Mechanically, is there anything I should be looking out for? Many thanks - Ian.


2. From : Jay Hart (ibcom@onebox.com)
Url : http://
Date : 01:32 PM Tuesday 25 November, 2003

Mico, Did you receive the address and information at your e-mail address? RSVP --Jay


3. From : Jay Hart (ibcom@onebox.com)
Url : http://
Date : 02:13 PM Monday 24 November, 2003

Mico, I tried, as in the past, directly e-mailing you details at your posted address. In comes back, as in the past, as undeliverable, none such at your listed .net. So, I'd rather send such privately than across the world. Send me your working address at my above posted address. --Jay


4. From : Mico (micolx@netscape.net)
Url : http://
Date : 01:39 PM Monday 24 November, 2003

Jay, I would be interested to try that other Sigma 1.4X (APO?), but it must be an old model? The only 1.4X listed and available from Sigma, APO or not APO, is the one you picked up. Anyway, is there any web or phone, since I am not familiar with the store you have mentioned? M.


5. From : Jay Hart (ibcom@onebox.com)
Url : http://
Date : 10:37 AM Monday 24 November, 2003

Mico, I am told no. They have some 5 element PKFA Sigma AF teleconverters of pristine quality now for that price. I was told it too is APO, but was not designated/printed on the gold box as such. "Made in Japan". It is still a deal. I do not know what the boarder crossing restrictions, if any, are. We have that free trade North American agreement in place, but there are all kinds of various exceptions by treaty. Call your customs people about how to cross without encumberance. RSVP. --Jay


6. From : Mico (micolx@netscape.net)
Url : http://
Date : 01:05 AM Monday 24 November, 2003

Jay, is SIGMA 1.4X APO still available on that special (29$)? Is it possible to order it fro Canada?


7. From : Jay Hart (ibcom@onebox.com)
Url : http://
Date : 06:51 AM Sunday 23 November, 2003

So, I just shot another roll and compared side by side the f 11 results of the A* 300mm f4 [as set at 5.6] with two stacked 1.4X teleconverters (One Sigma APO AF, one Pentax Xs KAMF) with the 600 mm f 5.6 set at fll. This means the stacked and assembled 300mm unit was stopped down one stop=three stops down from f4 (one stop for each 1.4X C, plus one more stopped down). The results were virtually identical in detail and contrast: the 600mm prime identically compared to the 588mm--as stacked. So, multiplying the 300 X 1.4 and then doing that again APO, with rare earth elements, has some amazing capability to keep it all together. This is the equivalent of a 1.96 X (and double corrected) teleconverter.

According to the light loss physics, this assembly would mean two stops loss, just like a 2X. But the results far exceed a 2x. The moral is that all of us should own and stack two 1.4X units, with a 300 or 400mm F4 for occasional field use. Use them one or two, buckle my shoe. This also means not carrying a 2X for much of any reason. Frankly, stacking a 2X on a 1.4X does not keep it all together. So, stacking a 1.4 and a 2X, as a resulting 2.8X, offers image loss, with not much gained but some magnification, and little else (contrast suffers, color, and detail. Plus one so loses then 3 stops to the so mixed stacked converter mass).

I have never read of anyone prior trying two 1.4Xs together for such use. We will call this an original LX Guestbook "find". As most people pick up either or a 1.4X or a 2X, or both, now we have cause to pick up primarily two 1.4X converters. The results are amazing, and can be stacked at a resulting F8 or slower from an F 4 lens, and at even better light aperture values from a 3.5 or 2.8 lens.

With only one converter in place, there is an unobservable difference one stop down (one stop of loss) from the 300mm f4 prime wide open: where the initial converter selects a smaller circle for imaging from the prime rear optical circle of confusion output than with the use of the straight prime 600mm (using the whole optical imaging output). Except now we are only talking 420mm, at f5.6. Using two such converters too, as 588mm for good light shots, is a very carriable package. This will become my hikable and skiable Canyon Country secret. Eat your heart out, Tom Till. --Jay


8. From : Jay Hart (ibcom@onebox.com)
Url : http://
Date : 01:02 AM Saturday 22 November, 2003

Toni, Your response is understandable. Though focusing wide open with the dual converter combo mentioned, I shot one stop down. Even so, the two combined "wide open" would be a stop less than the 600 5.6., not a true comparison, aperture for aperture. So, my comments on the two stacked were about being effectively at f11 and results accordingly. What was amazing to me was the smallness of the long focus package. No question the f 4 is a lesser optic than the 2.8 300mm A*. Even so, the moment one adds a converter, just like with an APS digital sized imaging sensor array in a camera reducing the imaging section normally used of a lens, one is suddenly selecting and isolating for use a center optical circle of a given lens. The converters mentioned do away with normal light fall off and normal reduced edge resolution. The surprizing result, in this case, was maintenance of contrast, in addition to picking up the sharper more even light of the reduced optical circle of confusion. I think it is a new phenomena ofr me with the 2 1.4Xs. I have an excellent 2X, but would not even consider stacking it--light loss, depth of field limits, etc. It would be difficult even to view through, let alone keep still. --Jay


9. From : GLOBETROTTER (globetrotterworld@hotmail.com)
Url : http://
Date : 11:38 PM Friday 21 November, 2003

Strange that you say that the A* 300mm F/4 with two stacked converters (or one X2 converter?) is similar to the A* 600mm f/5.6, Jay. I can understand that results would be close when each were used with a sturdy tripod, mirror lock-up and mid-range apertures, but surely not at wide open apertures?

I thought that the A* 600mm f/5.6 was based on the A* 300mm F/2.8, and the only lens that could match the original 600mm was the original manual A* 300mm f/2.8 combined with a Pentax A- 1.4XL converter.

I used to own the A* 300mm f/4, and although it was a superb optic (and lovely to handhold) - it did not quite match the results of the A* 300mm f/2.8 legendary lens. I obtained some very good results using the A* 300mm f/4 combined with the small A-1.4X converter, and even sometimes A-1.4X & 2X stacked together for daytime rising moon shots over the mountains (as long as I locked up the mirror, there was no wind, and I stabalised the junctions of the converter-to-bayonet mount) - but I still feel that these combos would not quite match the superb optics of either the A* 300mm f/2.8 + converter, or the A* 600mm f/5.6.


10. From : Ian (ian@ity.co.uk)
Url : http://
Date : 09:54 AM Friday 21 November, 2003

http://www.nikon.co.jp/main/eng/news/2003/1113_e_03.htm


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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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