One town, 100 names, 1 lens, 100 variety

[Darren]

Well, the reason Sigma has not produced it with HSM motors in a Pentax mount is that Pentax hasn't supported the technology up until now. With the release of the K10D in the next month or so, that is changing, butit will take some time for there to be enough Pentax bodies in the market for Sigma to do it in Pentax mount. In the end, I think adding USM will not only make Pentax faster and quieter, but also more attractive to third party manufacturers.

[Emiel_Skyfreak]

Thanks for the explaination.

If the Sigma 10-20 with HSM will arrive for the Pentax mount..will I be able to use the lens and all it's functions on the K100D or will some functions not be available..and only to K10D?

If Pentax gets more attractive for third party manufacturers, I think that's a good think. Hopefully the number of lenses on the market available for the Pentax Mount will increase, as now it's sometimes hard to find a specific lens for that mount. While it's easy to find it for Canon or Nikon.

[Darren]

I think the 10-20 is already out in Pentax mount; it is gear driven and not HSM. I think that in the future, the HSM/USM/etc versions released by the third parties will likely only AF with the K10D and later. I have read that the transmission and gears for the screw drive are prohibitively expensive, this is a big part of the reason that CAnon and Nikon mounts are always available, but Pentax aren't. Of course, the numbers of Canon and Nikon bodies out there plays into this too. Anyways, I would expect that if you go with some of those new lenses a year or so from now, you will be limited to manual focus on the K100D and earlier.

As of right now, it is not even clear what will happen with the new lenses Pentax has announced, which will be available next year. The 16-50/2.8, 50-135/2.8 and 60-250/4 will all offer USM motors; some people are saying that they will also offer the screw drive assembly and some just aren't sure. Pentax has said nothing concrete that I have seen. USM will be great to have, but there might be some growing pains for owners of older bodies.

I am guessing you know I am a Pentax shooter ;)

[Emiel_Skyfreak]

So in short, if I will buy myself a 10-20..with HSM when it will be available...probably my AF won't work ?
Okay, that's pretty shity, cause the camera is still brand new..and then allready there is a well, minor/major, depends on your preferences I think, compatibility problem..
Not so nice.

So if I'm getting what you're saying (I see your a Pentax shooter indeed) parts of the HS/US motor are quite expensive and this is the reason it's not available for Pentax mount ?


Hmm now I don't really know what to do, I nearby future I want more wide angle, but also want to have some other benefits above the lenses I have now. Maybe I don't need to stick to that.

[Darren]

So in short, if I will buy myself a 10-20..with HSM when it will be available...probably my AF won't work ?
Okay, that's pretty shity, cause the camera is still brand new..and then allready there is a well, minor/major, depends on your preferences I think, compatibility problem..
Not so nice.
IF you buy the 10-20 now, it will not have the HSM/USM/SilentWave motor in it. It will AF on any Pentax DSLR now and will on future cameras as well. No problems with compatibility. However, if, in a year from now, Sigma releases it as a USM/HSM/etc AF control in the Penta mount, it will not work on the cameras which are out there right now. Actually, it might; there is a chance it will be dual mode, but I think this chance is quite low due to the extra costs and difficulty in design.

So if I'm getting what you're saying (I see your a Pentax shooter indeed) parts of the HS/US motor are quite expensive and this is the reason it's not available for Pentax mount ?
Nope, not quite. My understanding is that nowadays, it is easier and cheaper to make an in lens focus motor than for the old style Pentax focus mount. The reason for this is that the gears and transmission have to be assembled largely by hand, but with the motor in lens, assembly costs are much lower. The reason that it is not available in a Pentax mount as of yet is simply that Pentax does not (until the K10D is released) have the compatibility for controlling a lens with the AF motor inside it. Pentax has to use the screw drive AF system, so there is no reason the lenses would have a motor in them. Again, this changes once the K10D is released, and the first three announced SSM lenses early next year. There are also rumors that a 35/1.4 will be along quite soon; that will be a great prime on the K10D.

Hmm now I don't really know what to do, I nearby future I want more wide angle, but also want to have some other benefits above the lenses I have now. Maybe I don't need to stick to that.If you like the Sigma 10-20 and you want it now, there is no reason not to get it now, as long as it is available. It is a screw drive AF system, but the new body will still support that. You won't be left with an orphan lens.

Hope this is making sense. Check out the <a href="http://forums.dpreview.com/forums/forum.asp?forum=1036" target="_blank" >Pentax SLR forum</a> at dpreview.com, there are lots of discussions going on there about campatibility. If you post the same question there, you will also find people who can explain it much better than me.

[Emiel_Skyfreak]

Thanks for the extensive reply on this matter, Darren. Really appreciate it.
I think I will get that lens before christmas (nice present isn't it? :-) )

I understand I can use it possibly later on the K10D, great.
Hope when I buy it, that a HSM version won't show up soon after that..
well, or maybe it won't really matter if the K100D, which I have now doesn't support it.
Won't buy the K10D just to have the oppurtunity to attaches a HSM version of the 10-20 to it.
Maybe in a few years, when I discover the limits of this camera.

We'll see.

Thanks again!

[cessy]

This is a good forum. I also often confuse.
For Example, Cambodia

Cambodia > West > Siem Reab

First, I believe the correct one should be Siem Reap

secondly, I saw lots of similar name under Siem Reap (which supposed to be Siem Reap)... which could be a headache to sort it out :
Angkor
Angkor Temples
Angkor Complex
Angkor Thom
Angkor Vat
Angkor Wat
Ankor
Ankor Wat
----> Well, there is Angkor Wat and Group of Angkor Thom, but maybe all could be under Angkor Temples . CMIIW

Banteay Srei
Bantaey Srei
--> Banteay Srei

Chong Knheas
Chong Kneas
--> Chong Knheas

Seam Reap
Seim Reap
Siam Reap
Siem Reab
Siem Reap
Siem Riep
SIEMREP
---> Siem Reap

Ta Phrom
Ta Prohm
---> Ta Prohm

Ton Le Sap
Tonle Sap
Tonle Sap Great Lake
Tonle SAP lake
--> Tonle Sap Lake