Lens Identification - Topman MC 75-200 F3.8

Started Mar 16, 2009 | Discussions
Auster Pilot Senior Member • Posts: 1,222
Lens Identification - Topman MC 75-200 F3.8

I acquired in a LBA buying spree sometime ago this lens:

Topman MC 75-200 F3.8 (Manual One-Touch zoom lens)

But I can't find anything on the web that describes this or a similar clone with the same focal range and aperture.

If it's genuinely F3.8 throughout the range then at 200mm it's one of the fastest lenses I have at that FL. But I was trying to find out if it's actually F3.8 to F?.?

Here are some pictures of it. It seems to take a reasonable photo and "feels" sharp wide open - I haven't done any scientific tests or anything.

It's a very heavy lens so I'm guessing it's got quite a bit of glass and metal in it. I'm more curious than anything. It has a Serial Number starting 79.... so I guess that is likely to be a year of manufacture.

Your thoughts much appreciated.

Neil

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vparseval Forum Member • Posts: 60
Re: Lens Identification - Topman MC 75-200 F3.8

Auster Pilot wrote:

I acquired in a LBA buying spree sometime ago this lens:

Topman MC 75-200 F3.8 (Manual One-Touch zoom lens)

But I can't find anything on the web that describes this or a similar
clone with the same focal range and aperture.

If it's genuinely F3.8 throughout the range then at 200mm it's one of
the fastest lenses I have at that FL. But I was trying to find out if
it's actually F3.8 to F?.?

Seems to be an obscure piece of glass. I've found it mentioned on a french Olympus forum: http://olympus.xooit.com/t1891-Test-en-photos-tamron-60-300-et-Topman-75-200.htm

Also, the 75-200 f/3.8 brings up hits for a Vivitar lens. I wouldn't be surprised if Topman was a rebadge of that (remove spaces): http : www.pentaxforums.com/forums/pentax-slr-lens-discussion/18440-vivitar-75-200-f3-8-a.html

It also appears to exist as Sigma, for example http://www.mail-archive.com/pdml@pdml.net/msg220180.html

Given that it was likely an inexpensive acquisition and you wont get much when selling it, I'd keep it. That's the nice thing about rare niche lenses. Occasionally, you'll come up with a use for it where no other lens quite cuts it.

Cheers,
Tassilo

DrewE Senior Member • Posts: 2,053
Re: Lens Identification - Topman MC 75-200 F3.8

It seems it wouldn't be too terribly hard to test the aperture range yourself, at least to get a rough idea. Start with some evenly illuminated wall (or any non-changing uniformly illuminated blank area), and take a properly exposed shot wide open at 75mm. Then, at 300mm, take a sequence of shots at the same shutter speed and slower ones by steps. By finding the 300mm shot with the same brightness as the 75mm shot, you can see how many stops slower it is, if any.

I suppose a slightly rougher idea could also be obtained just using the camera's light meter; it might not be nearly as accurate, though.

What's the filter diameter? If it's less than around 80mm or so, it cannot possibly be a constant aperture f3.8 lens.
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amicah22 Senior Member • Posts: 1,320
Re: Lens Identification - Topman MC 75-200 F3.8

My sears 80-200 f\4 has a filter size of 55mm and my vivitar 200 f3.5 has a filter size of 62mm. I also had a vivitar series one 2.8-4.0 with a filter size of 62mm. Anyhow I'm curios about your lens - I would love to see some pics\crops taken with it.
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OP Auster Pilot Senior Member • Posts: 1,222
Re: Lens Identification - Topman MC 75-200 F3.8

vparseval wrote:

Seems to be an obscure piece of glass. I've found it mentioned on a
french Olympus forum:

http://olympus.xooit.com/t1891-Test-en-photos-tamron-60-300-et-Topman-75-200.htm

Also, the 75-200 f/3.8 brings up hits for a Vivitar lens. I wouldn't
be surprised if Topman was a rebadge of that (remove spaces): http

: www.pentaxforums.com/forums/pentax-slr-lens-discussion/18440-vivitar-75-200-f3-8-a.html

It also appears to exist as Sigma, for example
http://www.mail-archive.com/pdml@pdml.net/msg220180.html

Given that it was likely an inexpensive acquisition and you wont get
much when selling it, I'd keep it. That's the nice thing about rare
niche lenses. Occasionally, you'll come up with a use for it where no
other lens quite cuts it.

Cheers,
Tassilo

Thanks for those more useful links - I think the first one definitely refers to this lens. The Sigma link refers to a lens that is significantly different to look at than my Topman. The Vivitar(Kiron) also looks slightly different from what I can see (different front end and seems to miss the chrome mounting plate that the Topman has. It truly is a heavy lens and I reckon it is heavier than my massive Sigma 120-400mm HSM! But I haven't got round to weighing it yet.

Neil
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jeffkrol Veteran Member • Posts: 6,225
Tough one

Seems there is some reference to lenses, teleconverters and tripod/tripod heads..

Now if your really curious there is a lens manual for purchase (cost as much as the lens??? ;)). That may contain more info on manufacturer (or at least brander)

http://www.oldtimercameras.com/ephotozine/stock/Model.asp?Model=18988&ModelPage=true
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OP Auster Pilot Senior Member • Posts: 1,222
Re: Lens Identification - Topman MC 75-200 F3.8

Here are a few photos taken with it today. Similar levels/minor sharpening/minor saturation applied to output from RAW files from Samsung GX-10:

http://ack3xa.bay.livefilestore.com/y1pIVztLEYHOUy_z5RWCQ7Ey6oVUAqxsotx9BbXxOnVarJ1yu4aloM-3zBu8xdIBSOKNqkJvWVoqfHD8wujuRpu1g/SG104202%20 (Large).jpg

http://ack3xa.bay.livefilestore.com/y1pW6h4oCHd4o-Qp_S7MBIBjZZ2CACHKcXrOLhGRx8hw0l6rOxGZM7el_h7LxJl53sz59kPY6uOmqQM6xbBlV5K2Q/SG104215%20 (Large).jpg

http://ack3xa.bay.livefilestore.com/y1p3GZYl0hgYN9qliQe5fBU_sBPMPA2d1cw0a-u2mZRb42n98vknCtc7ZgJjlXPPhWXdssbP5KvodPnKNws3xFmOg/SG104244%20 (Large).jpg

These should be 100% crops:

(Centre Crop - F8):

(Centre Crop showing CA - F3.8)

(Lower Right Hand Corner - F3.8)

Overall and considering this lens was to all intents a "freebie" thrown in with some other lenses, I'm fairly impressed with it's performance. It's quite easy to manually focus (I hard hardly any that were thrown away due to out of focus problems) - but a number were blurred due to movement due to the weight of the lens.

I think I'll hang on to this.

Neil
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DrewE Senior Member • Posts: 2,053
Re: Lens Identification - Topman MC 75-200 F3.8

amicah22 wrote:

My sears 80-200 f\4 has a filter size of 55mm and my vivitar 200 f3.5
has a filter size of 62mm. I also had a vivitar series one 2.8-4.0
with a filter size of 62mm. Anyhow I'm curios about your lens - I
would love to see some pics\crops taken with it.

Whoopsie -- I made a typo on the calculator with my math (300mm focal length instead of 200mm focal length). 55mm or so would be a more accurate upper bound for the diameter of a 200mm f3.8 lens. (200mm / 3.8 = 52.6 mm)

Sorry for the confusion. Your lenses are indeed physically possible, which I'm sure is a bit of a relief!
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KentG Veteran Member • Posts: 4,762
Re: Lens Identification - Topman MC 75-200 F3.8

The pictures indicate to me it is either a Sigma or a Sun lens, which means it was made in the same factory as they merged a few decades ago. The contruction appears identical to some of the Sigma XQ series lenses, so my guess is that it is a rebadged Sigma from around 1974 or so. If I could get a better view of the lettering around the rear I could be more definite.
Kent Gittings

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KentG Veteran Member • Posts: 4,762
Re: Tough one

That site indicates it maybe either a TX or a YS interchangeable lens mount. If TX it may then be a Komine but if YS it would definitely be a Sun/Sigma. The YS K-mount was was too complicated for customer swapping as it had to be factory installed. I have a Sigma XQ 135/1.8 in just such a YS mount in my collection. I have a Vivitar 400/5.6 in TX K-mount also.
Kent Gittings

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