Re: [APML] Pentax 67 1.4x rear converter

[Wei-Hao Wang <whwang@gmail.com>]

Hi,

I sold it already.  

I used this lens on my Pentax 105SDHF.  It produces very sharp
image at the center and the very corners of the field of view.  However, 
there is slight aberration between the center and the corners.  At about 
3cm from the field center, the sharpness is noticeably worse.  You can 
see this clearly in this image:
http://www.ifa.hawaii.edu/~wang/gallery/picutres/m31-2004.htm

I cannot predict how it will perform on FSQ 106.  I believe the image
will still be sharp at the field center but cannot be sure about the 
corners.  The aberration on my 105SDHF is produced by the combination 
of my scope and the rear converter.  It is not necessarily true that the rear 
converter alone is responsible for the aberration.  I bought this converter 
from Matt BenDaniel.  He may have used it on his 130 EDT.  You can ask 
him what the result was to get a rough idea about how this converter 
performs on various systems.    (This guarantees nothing on FSQ106, though.)

Cheers,

Wei-Hao



On Apr 10, 2005 7:56 PM, * <astrobound@yahoo.com> wrote:
> On doing a Google search for a Pentax 67 1.4x rear
> converter I saw Wei-Hao's offer to sell one of these
> back in Dec 04. I would be suprised if you still have
> it Wei Hao but can you give me your impression on it?
> Do you know if this would work on an FSQ?
> 


-- 
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Wei-Hao Wang  :)

Institute for Astronomy at University of Hawaii

Address:                       
2680 Woodlawn Drive         Personal Website:
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