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Access P-MC Zoom 35-70mm f/2.5-3.5 Macro
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PostPosted: Sun Oct 08, 2023 3:19 am    Post subject: Access P-MC Zoom 35-70mm f/2.5-3.5 Macro Reply with quote
Recently laid my hands on this little thing for some $10. I was sold on the f/2.5 up to 60mm.

Some preliminary results here.

Timothy by Artem, on Flickr

Playing with the macro function

Timothy by Artem, on Flickr


PostPosted: Sun Oct 08, 2023 4:21 am    Post subject: Reply with quote
Like 1


PostPosted: Sun Oct 08, 2023 6:40 am    Post subject: Reply with quote
Sweet!


PostPosted: Sun Oct 08, 2023 8:51 am    Post subject: Reply with quote
Nice pics. I should really use mine more.


PostPosted: Sun Oct 08, 2023 10:56 am    Post subject: Reply with quote
Now I've learnt about another new (but old) lens. Quite unusual speed, if it's real.


PostPosted: Wed Oct 11, 2023 11:42 am    Post subject: Reply with quote
Dejan wrote:
Now I've learnt about another new (but old) lens. Quite unusual speed, if it's real.


Made by kobori (tefnon) and also sold as soligor, cpc...
ALL 35/70 3.5 (3.6) are basically 2.5/3.5 lenses but to avoid low iq at 35mm, the stop is locked at 3.5 at 35mm


PostPosted: Wed Oct 11, 2023 12:23 pm    Post subject: Reply with quote
PBFACTS wrote:

ALL 35/70 3.5 (3.6) are basically 2.5/3.5 lenses but to avoid low iq at 35mm, the stop is locked at 3.5 at 35mm


Maybe. Maybe not. The Canon FD 2.8-3.5/35-70mm was the very first two group wideangle zoom produced, and it is pretty OK at 2.8/35mm.

The main reason for producing "constant aperture" zooms was flashlight exposure. Most of the classical 3.5/35-70mm zooms (all using the same basic optical formula as the original Canon FD 2.8-3.5/35-70mm) were calculated around 1975 - years before TTL flash metering would become widespread. Examples include the Konica AR 3.5/35-70mm, the Minolta MD (Leica R) 3.5/35-70mm, the Nikkor Ai/AiS 3.5/35-70mm versions, the Olympus 3.6/35-70mm, the Yashica ML 3.5/35-70mm, and the Zeiss CY 3.4/35-70mm. They all have a (complicated!) mechanical compensation mechanism to keep the aperture constant while zooming.

Pentax took the Canon road and made a 2.8-3.5/35-70mm though, going for a simpler aperture construction.

Later on, when TTL flash metering became common, most midrange zooms would have variable speed, often reduced to 3.5-4.5/35-70mm.

S
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