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 : AB (email@example.com)
Url : http://
Date : 09:37 PM Monday 27 March, 2006
There is a new LX on eBay ( 7603498937 ) 536**** a non-new 536**** went recently for £511 so this one may go for more but who knows. Feeling quite smug about my 536**** for £200! my pentaprism cover has a small dent but I won a brand new pentaprism cover on eBay so I just need to fit it - will probably get Robin to do it as he has the sealant, skills and practice to make a neat, proper job of it.
Globetrotter, you've been talking about getting another LX, maybe this new one is the one for you?
AB2. From : Jay (firstname.lastname@example.org)
Url : http://
Date : 07:22 AM Monday 27 March, 2006
When using a ring flash with a prime lens and a 1.4X converter, does a prime lens f 32 become f 64 as the smallest f stop for lighting output needs, and as to achieving its depth of field result seems to be the basis of Philip's question.
I frankly do not know if the small end of the aperture ring shape shifts to f64 by the combination of a converter’s magnification and extension, though it seems likely in theory. So, to find out what is indeed so, possible, and useful for achieving pleasing results, I would run tests using the 1.4X on one or more of your macros. This would include adjusting the source light flash output(s) higher for more illumination based on such an assumption, or simply on the fact that the spreading of a more centralized portion of the exit lens image of the prime lens by the converter requires an additional stop’s more light on or from the subject for a proper exposure. It is certain that 100% more light on or from the subject will be required over and above whatever the f stop illumination normally required that is selected on the prime lens aperture ring (with the converter-lens application, if it indeed shifts to f64 from f32, or even if not so; this assumption is based on a predetermined sync shutter speed, as such. Certainly light on the film plane is achieved by shutter speed and aperture combinations and adjustments working in concert as to halving and doubling available light, where so. Here I am addressing ring flash output, as per Philip's question and use).
Of course, this amount of light output from a ring flash would only be possible with very close subjects, as it would require very high joules or watt seconds to place acceptable lighting on a more distant subject for such a small aperture setting as f32 or f64. I wonder, even at f32, how long the flash unit takes to recycle? It must be three cricket's tunes in time, at the very least.--Jay
3. From : Philip Ashman (email@example.com)
Url : http://
Date : 04:09 PM Saturday 25 March, 2006
Thanks for that explanation Jay. I must admit that I had never thought of adding my 1.4x converter onto my Sigma 105mm macro (or now also onto my Pentax 100mm) as I had wrongly assumed it would simply allow me to take the same shot (1:1 macro) from a little further away, but still at the same ratio. I can now of course understand what you mean and feel a litle silly not recognising the way it would work! But hey, that's the wonderful thing about friendly forums like this, as you are constantly learning new things and sharing experiences.
I will indeed now be looking forward to experimenting this way just as soon as we get some subjects emerging from the winter slumber for me to enjoy photographing.
iJust a further question, that I hope is not also a but daft, but, I was wondering about how this may also affect the minimum aperture available on my macro lenses when adding a 1.4x converter. I am aware that when adding a 1.4x converter to a prime lens the maximum aperture reduces by a stop so, for example, my 300mm f2.8 becomes a 420mm f4. Does it therefore also push back all the other available apertures by a stop, so that if my 300mm has a minumum aperture of f22, then it would that become f32 (?) with a 1.4x converter attached?
The reason I ask is that both the sigma 105mm macro and the Pentax 100mm macro have minimum apertures of f32, that I would use as far as possible for my insect macro shots in order to get as much DOF as possible. It would therefore be of great additional benefit to me if by adding a 1.4x converter it would also give me a smaller minimum aperture to work with. However, maybe it would be of no advantage in real terms as with the image now larger than 1:1 through the addition of the 1.4x coverter, then relatively speaking my DOF would remain the same.
Once again, am I missing the point here, or have I got it right this time?
Any thoughts most welcome.
Philip4. From : Jay (firstname.lastname@example.org)
Url : http://
Date : 12:05 PM Saturday 25 March, 2006
I was reminded that a reversal ring (Kmount to a lens to be mounted in reverse filter size) and a telephoto zoom lens can achieve greater than life size macro. I used to use this with the push-pull zoom Tamron 75-150 mm adaptall 2, and it would work with a like Soligor or Pentax M of a similar range (with a 49mm filter size). The results were excellent FYI.
I understand that third party K mount to other filter size reversal rings are available. --J.5. From : Jay (email@example.com)
Url : http://
Date : 05:55 AM Saturday 25 March, 2006
Yes Philip, you missed something. A teleconverter extends focal length, while still maintaining the original lens' close focus ability. It is kind of like getting an APS sized DSLR, with its increase in image closeness for a 35mm system lens, as a magnification comparison. When focal length X becomes X+ (i.e. X 1.4)the result is a smaller subject area filling the full frame from the same focal point. Try it, then you'll know. If it did not have the magnification factor too, it would act as a kind of extension ring anyway. As it is, it extends the prime lens and magnifies the result across the entire format focal plane. The result with my Pentax A series 100mm macro lens is 1.4X (times a) life size rendering of its closest focus 1:1 image, when so.
This is another kind fact of teleconverters, that they maintain the closest focusing distance of whatever lens is attached to them. Although they do not sell like they used to, before zooms became the rage, they do have use. --Jay6. From : Philip Ashman (firstname.lastname@example.org)
Url : http://
Date : 04:58 PM Friday 24 March, 2006
Thanks for the advice/suggestions on my macro (above 1:1 ratio) question. However, I am a little puzzled by what you say. I can see how extension tubes would increase magnification to get above 1:1 as their purpose is to extend the lens away from the focal plane for macro work, but surely adding a 1.4x converter to any lens simply increases the focal length of the lens (100mm becomes 140mm) and would not allow any greater magnification of the subject at the closest foscussing setting. Am I missing something here?
I note that you do not think a carbon tripod is the answer, but I was not meaning for close up insect work, as it is not practical to use a tripod in that environment and I therefore use a ringflash for my macro work enabling me to move about quickly and take a shot without setting up equipment. What I do use my tripod for is for distance wildlife shots using the 300mm or 500mm lenses and I therefore think that any tripod that would be just as sturdy (carbon) but much lighter & therefore easier to carry would be an advantage in my circumstances.
I suppose that when dealing with greater than 1:1 magnification, by whatever means (bellows/extension tubes)it would most likely be very difficult out in the field with live insects who are somewhat reluctant to sit still whilst I set up and I was thinking more along the lines of flowers/indoor shots where the subject does not move etc.. for perhaps bellows work. I know that some enthusiasts capture insects and either trap them between glass in set up scenarios, or even 'chill them' so that they can hardly move in order to then set up a shot at very high magnification, but this is not something I would feel comfortable doing and generally I like to simply photograph them in their natural state out in the wild.
Philip7. From : Jay (email@example.com)
Url : http://
Date : 01:48 PM Friday 24 March, 2006
Pentax DSLRs are emerging as a complete system, something not seen so over a year ago. The newer optics' results look as saturated and sharp as the older zooms, and, so too some even seem akin in results to fixed focal lengths of the past. Enjoy the shots, see http://www.pentaxslr.com/lenses. Recommended is the 14mm f 2.8--which shoots supreme. It is clear too, from crusing the system, that Pentax is geared to go the full distance ahead. --Jay8. From : Jay (firstname.lastname@example.org)
Url : http://
Date : 08:31 AM Friday 24 March, 2006
Macro/micro shooting. Go above life size several ways: auto K extension ring(s) (but the lens will be MF as a result of such attachments), auto KA contact matching carriage extension rings, non-auto K extension rings, add-on magnification front filter(s). What I use, is my trusty 1.4X Pentax non AF KA short version converter, or my Sigma 1.4X KAF teleconverter.
Or, use another telephoto with Close focusing, or try your 300 or 500mm: if minimum focusing achieves greater than 1:1. Bellows units also work, and may be compensated for by the TTL meter. The problem there is that your insect interest has to be pursued with a very fieldable tripod. Carbon is not the answer, but the bembo type tripods, with maximal center column adjustments, which Manfrotto also copied to some degree on one or two offerings, and, perhaps, bettered. --Jay9. From : Philip Ashman (email@example.com)
Url : http://
Date : 06:21 AM Friday 24 March, 2006
My 300mm f2.8 is the SMC FA* IF & ED. You mentioned the MF ? Are we talking about the same lens, as mine is autofocus and MF I assume is the manual focus?
Anyway, its really superb and the feather detail I can pick out in images of birds is something truly wonderful. I also love the look of it!
Wondering now though, with these new big lenses I've acquired, about whether I need to invest in a new lightweight carbon tripod. I currently use a Manfrotto O55 pro aluminium, with 460 mg head, but as I only have a motorbike (fireblade) for transport, you can imagine the difficulties I encounter in carrying my kit. I have recently bought the Lowepro photo trekker backpack, which is superb for holding a lot of gear, but any weight reduction I can achieve would still be most beneficial.
Maybe it's just time I learnt to drive a car!
A further question for you guys:
At the moment I shoot macro at 1:1 ratio with either my new Pentax 100mm or Sigma 105mm. I would like to be able to get even more closer (above life size) if possible and am wondering the best way to go about it.
I do have a set of auto extension tubes that I used to use with my 50mm and suppose it would get me above life size if I added them onto the macro. Is that correct? Or, do Pentax make any bellows for the LX system and would they be a better idea? Never used bellows before.
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Url : http://www.nikon.me.uk
Date : 05:19 AM Friday 24 March, 2006
The PENTAX LX GOLD on Ebay has just passed the £2,000 ($3,500) mark, with 4-hours to go...and yet it has still not passed the Reserve price!
Maintainers for Pentax LX Series SLR Camera Models Message Board:
Tony Davies-Patrick (Globetrotter) (email@example.com); Mico Smiljanic (firstname.lastname@example.org);
Jay Hart (email@example.com); Philip Ashman (firstname.lastname@example.org)
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