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?
