Forums is giving me problems signing in, but here's the answer.
The vivitar has a somewhat larger cowel on the aperture lever.
It worked fine on the original KM, KX, and K2 film cameras of the era.
It needed to be cut down to fit in the mirror box of the later ME, MX, etc.
If it has been used on a digital or later film camera, this has
already been done.
Fred Wasti had a web site where he showed how he did it...
Regards,  Bob S.

On Thu, Oct 17, 2013 at 3:37 PM, Alastair Robertson
<[email protected]> wrote:
> Darren
>
> can you comment on this post
> http://www.photography-forums.com/vivitar-series-one-90-180-4-5-flat-field-macro-and-pentax-k10d-t83670.html
> Does it mount on a K10 or K5?
>
> Alastair
>
> On 18 October 2013 07:13, Darren Addy <[email protected]> wrote:
>> I appreciate the feedback, Bob.
>> Alright, I'll start the price at $450 and come down to $399 if I need
>> to, in time.
>> :)
>>
>> On Thu, Oct 17, 2013 at 1:05 PM, Bob Sullivan <[email protected]> wrote:
>>> Darren,
>>> That's too low a price!
>>> I'd snap it up if I didn't already have a copy here somewhere.
>>> The quality is legendary for a Macro and the zoom makes it outstanding.
>>> It was one of the first lenses I lusted after some 20 years ago.
>>> Regards,  Bob S.
>>>
>>> On Thu, Oct 17, 2013 at 9:17 AM, Darren Addy <[email protected]> wrote:
>>>> I will be on the road tomorrow, so I hope you will permit me to post
>>>> this a day earlier than normal. The astrophotography bug is biting and
>>>> so I'm looking to purchase a lens that will perform on the other end
>>>> of the spectrum from this one and to pay for it I need to move a
>>>> couple of my better lenses, but this is a beauty. You already know
>>>> that LOOONG focal length macros are desirable for working distances.
>>>> (See the prices for the Pentax-A* 200mm macro, as an example). Here is
>>>> a macro that gives you 1:2 at 180mm (and the freedom to use other
>>>> focal lengths as well). The "Flat Field" means higher quality in the
>>>> corners than you are probably used to in ordinary macro lenses.
>>>>
>>>> This is one of the "cult classic" lenses that you rarely find in a
>>>> Pentax mount. This is a gorgeous copy of this lens and it it ready to
>>>> use on your Pentax DSLR. My only reason for selling this beauty (and
>>>> another scarce lens) is to pay for a high-dollar lens that I really
>>>> need more for astrophotography.
>>>>
>>>> The Cult Classics page has this to say about the Vivitar Series 1
>>>> 90-180mm Flat Field:
>>>>
>>>> - - - beginning of quote - - -
>>>>
>>>> Vivitar 90-180mm f/4.5 Flat-Field Macro Lens
>>>>
>>>> Vivitar also made a number of high quality zooms under the Series I
>>>> label. The 90mm to 180mm
>>>> f4.5 flat-field VMC lens from 1978 is an optic that has also achieved
>>>> cult status
>>>> .
>>>> This Vivitar 90-180mm f/4.5 lens was really designed for medical
>>>> photography needs. A ring-light flash unit was designed to mount on
>>>> the front of this lens too. But as far as I know, it was never
>>>> released. This original medical market niche explainssome of the
>>>> design features and range of this high quality zoom lens.
>>>>
>>>> This lens is over 6 inches long, and pretty heavy at 2.3 pounds. At a
>>>> constant f/4.5, you aren't going to value it for its speed either. But
>>>> it produces excellent results in macro-work down to 1:4 at 90mm and to
>>>> 1:2 at its 180mm setting. On most modern zoom lenses, macro
>>>> photography settings are a lower quality setup. Achieving macro
>>>> capabilities means shifting some elements and so sacrificing some of
>>>> the zoom's control over spherical and other aberrations.
>>>>
>>>> Most current zooms only offer macro settings at either one end or the
>>>> other of their range. Generally, you would prefer macrophotography at
>>>> the longer end of the range, but most zooms opt for the easier macro
>>>> settings at the shorter end of the zoom's range. Only a few zooms
>>>> offer continuous macro-settings over their full range. Even the better
>>>> current zooms generally only get to 1:4 to 1:6 reproduction ratios
>>>> (.e., the object is one-fourt
>>>> h lifesize on film). The Vivitar 90-180mm f/4.5 Series I macro zoom is
>>>> designed to provide the highest possible
>>>> quality continuously down to its closest macro settings. The Vivitar
>>>> 90-180mm f/4.5 flat-field lens provides high quality macrophotography
>>>> continuously from 90mm (to 1:4) to 180mm (to 1:2). That's unique, and
>>>> useful, so you should expect to pay quite a price premium for such a
>>>> cult status lens! "
>>>>
>>>> - - - end of quote - - -
>>>>
>>>> Here is a set of images produced by this same model of lens:
>>>> http://www.flickr.com/photos/odderikgarcia/sets/72157606482781081/
>>>>  and here is another thread with images from the Vivitar Series 1
>>>> 90-180mm Flat Field
>>>> http://forum.mflenses.com/viewtopic.php?t=17707
>>>>
>>>> This lens is in excellent cosmetic, optical and mechanical condition.
>>>> I will be happy to ship this lens WORLDWIDE to PDML members.
>>>>
>>>> This lens is virtually never seen in a PK mount, so here is your
>>>> chance to get a Pentaxian's rarity. Priced to sell at $399 plus actual
>>>> shipping. (See eBay for much higher prices in a much more common
>>>> mount, and you don't often find eBay sellers willing to ship
>>>> worldwide).
>>>> http://www.ebay.com/itm/like/280905685736?lpid=82
>>>> Contact me for a shipping quote to your location (serious only, please).
>>>>
>>>> (Apologies for the wordiness, but I figured I would just copy and
>>>> paste what I plan on saying in my Pentax Forums Marketplace ad, to be
>>>> placed later today. Email me for photos, if interested.)
>>>>
>>>> Respectfully,
>>>>
>>>> Darren Addy
>>>> Kearney, Nebraska
>>>>
>>>>
>>>> --
>>>> Nothing is sure but death and Pentaxes.
>>>>
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>>>
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>>
>>
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