Re: Re[2]: 100mm Macro Lenses

2001-08-13 Thread gert . jan . bollen 


Hi Alin,

Thanks for the Idea to use tape to disable the autofocus, my only worry is that the 
contacts are becomming durty.

Gert Jan Bollen



   Hi Gert,

   Place a duct tape on the lens mount over the autofocus shaft and
   the first contact near it, and your F 100/2.8 turns into an A
   100/2.8 featuring the focus trap capability.

   Servus, Alin

gert wrote:

gjbpc> I recently bought the SMC F 100mm 2,8. Yes I like the extra
gjbpc> speed and the AF for normal distance pictures, but the focus
gjbpc> trap does not work since you can not put the lens to manual
gjbpc> focusing!




Gert Jan Bollen


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Re: 100mm Macro Lenses

2001-08-10 Thread gert . jan . bollen 


Hi Rob

the 100mm 3.5 is made by cosina, you can also buy it with the name soligor or vivitar 
on it it goes to 2:1it is alright at 8~11.
but the build quality is no were near the other lenses.

I have experiance with the SMC-M 100mm 4.0 manual focus lens. If you intend is to use 
this lens only for macro it is the best choice.
you can use the focus-trap on your camera. this lens is build to last and costs about 
200 dollars used.

I recently bought the SMC F 100mm 2,8. Yes I like the extra speed and the AF for 
normal distance pictures,
but the focus trap does not work since you can not put the lens to manual focusing!
I should have bought the SMC FA 100mm 2,8 which does has an extra switch on the lens 
to put it in manual focusing mode.

But in the end, macro lenses are used around aperture 11 and every macro lens is 
optical OK by than!


Gert Jan Bollen
Design Engineer

Automotive BL Nijmegen
Gerstweg 2, Building BX4
6534 AE Nijmegen
The Netherlands
Tel  : 31- 243534772
Fax : 31- 243534100
mailto:[EMAIL PROTECTED]





"Rob Brigham" <[EMAIL PROTECTED]>@pdml.net on 08/10/2001 12:06:20 PM

Please respond to [EMAIL PROTECTED]

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cc:  (bcc: Gert Jan Bollen/NYM/SC/PHILIPS)
Subject:  100mm Macro Lenses
Classification:



Anyone compare the FA 100mm macros?  I see there is a big price
difference between the F3.5 and F2.8 versions.  How do they compare for
sharpness?

Also, how do they compare to third party lenses eg Sigma 105 EX?  Flare
resistance is not really an issue for this lens as it will not generally
be used in condidions where this is a factor.

Rob
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