Does this mean you have decided on the 100-300 then? The b****rs - why didn't they tell me this before I bought mine? Does this mean that the MF gears will 'declutch' in AF mode? This would make it quieter and perhaps faster and use less juice/cause less wear. I don't mind switching modes using the body, but having the MF movements disengage in AF mode would be nice. I don't really like the 2 stage declutch that I have on my 105 macro though - the manual states that using AF with the lens set to MF could break the lens as the gears arent meant to be used in that way. I am often finding I have MF selected on the lens by mistake and it really bothers me.
I never really saw HSM as being much faster anyway - especially if you compare it to a declutched non-HSM model! > -----Original Message----- > From: Sylwester Pietrzyk [mailto:[EMAIL PROTECTED]] > Sent: 20 November 2002 12:35 > To: [EMAIL PROTECTED] > Subject: New 100-300/4 and 28-70/2.8 lenses from Sigma! > > > Hi, > here is the responce I got from Sigma Japan. Now I can wait > for modified lenses, that will switch to manual focus only > via clutch mechanism without using AF/MF switch on the body > (just like FA* series!). It is nice that they took it in > consideration! Also note second point on AF speed of 100-300 > in comparison to HSM version :-) > > -- > Best Regards > Sylwek > > ---------- > From: "Denju Matsumoto" <[EMAIL PROTECTED]> > Reply-To: <[EMAIL PROTECTED]> > Date: Wed, 20 Nov 2002 20:36:34 +0900 > To: "Sylwester Pietrzyk" <[EMAIL PROTECTED]> > Subject: RE: question > > Dear Mr. Sylwester Pietrzyk > > We are sorry for delayed answer for your inquiry below. > > 1. We are planning to modify 28-70/2.8 EX DF lens but are not > sure when > the modified lens will be in the market at this moment. > It should be > identified by the serial number or printing on the > barrel. It is the same > situation for 100-300/4 EX lens. > > 2. I personally checked 70-300/4-5.6 DL Macro and 100-300/4 EX lens > at our warehouse and found 100-300/4 EX focused much faster > than 70-300 lens does. I could not measure how fast it > was but I felt > 20 to 30% faster. Also, I made comparison test with > 100-300/4 EX HSM > type lens and found the focusing speed was almost the > same. I felt the > difference in noise at focusing. Of course, non-HSM 100-300/4 made > bigger noise than HSM type lens but it was better than > 70-300 lens. > I hope this report would satisfy your demand! > > > Best Regards > > Sigma Corporation > Denju Matsumoto > > > -----Original Message----- > From: Sylwester Pietrzyk [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, November 13, 2002 6:14 PM > To: [EMAIL PROTECTED] > Subject: Re: question > > on 13.11.02 9:27, Denju Matsumoto at > [EMAIL PROTECTED] wrote: > > Dear Mr. Denju Matsumoto, > thank you for so quick answer! Can I ask you three more > questions please? > > > 1. We guess that you are talking about Sigma 28-70/2.8 EX DF and > > 24-70/2.8 EX DF lens. As you pointed out in your e-mail, > both switch > > on the lens and camera body has to turn into MF position to focus > > manually. It was difficult for us to design as one switch > operation on > > these models at the stage of development since we need to > prepare the > > same model other than Pentax mount. Now, we are planning to > modify the > > lens to one switch operation as you are requesting. > These are great news for me, as I have 28-70/2.8 EX DF on my > "to buy" list! When these modified lenses will be available > on market? How will I recognize that they are new, when > buying for instance in internet shop? Will you add such a > modernisation to other EX lenses like 100-300/4 - the one I > would like to buy soon? > > > 4. Unfortunately, we can not tell you how fast the > 100-300/4 EX lens > > focus. Because there are many conditions that influence to the > > focusing speed such as type of body, status of battery, > photographic > > situation, contrast of subject, temperature and so on. > Therefore, we > > recommend checking the lens at the camera shop. > Unfortunately no shop is offering this lens in Pentax mount > right now :-( Actually I was thinking about just plain > comparison - is it much worse than with HSM version? Or > better - how does its AF compare to AF speed in popular > consumer lenses like 70-300/4-5.6 DL Macro? > > > >
