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Arutemu
Joined: 16 Oct 2014 Posts: 72 Location: US/Japan
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Posted: Sun Oct 08, 2023 3:19 am Post subject: Access P-MC Zoom 35-70mm f/2.5-3.5 Macro |
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Arutemu wrote:
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 _________________ 住めば都 |
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jamaeolus
Joined: 19 Mar 2014 Posts: 2964 Location: Eugene
Expire: 2015-08-20
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Posted: Sun Oct 08, 2023 4:21 am Post subject: |
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jamaeolus wrote:
_________________ photos are moments frozen in time |
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caspert79
Joined: 31 Oct 2010 Posts: 3132 Location: The Netherlands
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Posted: Sun Oct 08, 2023 6:40 am Post subject: |
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caspert79 wrote:
Sweet! |
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eggplant
Joined: 27 May 2020 Posts: 517
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Posted: Sun Oct 08, 2023 8:51 am Post subject: |
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eggplant wrote:
Nice pics. I should really use mine more. _________________ UK |
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Dejan
Joined: 05 Jan 2021 Posts: 148 Location: Belgrade, Serbia
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Posted: Sun Oct 08, 2023 10:56 am Post subject: |
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Dejan wrote:
Now I've learnt about another new (but old) lens. Quite unusual speed, if it's real. |
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PBFACTS
Joined: 24 Dec 2008 Posts: 568
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Posted: Wed Oct 11, 2023 11:42 am Post subject: |
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PBFACTS wrote:
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 _________________ OM USER .. I KEEP/USE:
Om2 sp + T32 (grip/filter/zoom) + T8
+ Zuiko 16mm 3.5 / 55mm 1.2 / 65-200 4/ x1.4
+ Sigma 8mm 4.0 / 14mm 3.5 / 18-35 3.5-4.5
+ Tamron 35/105 2.8
+Tokina 150/500 5.6
+ Kiron 105/2.8 macro 1:1
+ Vivitar S1 90/180 falst field macro
+ 2x Doubler HR7
>>I SELL: OM10 + OM4ti
+ i sell: OM Md1 + Md 2 + Grip PowerPack + charger
+ i sell: OM Zuiko 24mm 2.8 / 28mm 3.5 / 50mm 1.8 / 50mm 1.4 / 50mm 3.5 macro / 35-70 3.6 / 35-105 3.5-4.5 / 75-150 4 / 500mm / 2xA
+ i sell: OM Kiron 28/105 3.2-4.5 / 1.5 converter
+ i sell: OM Makinon reflex 5.6/300 + Spector reflex (makinon) 500mm
+ i sell: OM Macro panagor extender 1:1
+ i sell: OM Sigma 16mm 2.8 fisheye (last version) / 21-35 3.5-4.2 ot/ 28-70 2.8 /1000mm mirror
+ i sell: Tamron 28-70 3.5-4.5 / 28-80 sp 3.5-4.2 / 28-135 sp 4-4.5 / /28-200 3.5 / 35-135 3..5-4.5 / 90mm sp macro 1:1 2.8
+ i sell: OM Soligor 2x doubler / x3 converte
+ i sell: Soligor FisheEye x0.15
+ i sell: OM Tokina 28/135 4-4.6 / 70/210 3.5 (= vivitar S1 v2)
+ i sell: OM Vivitar 28-70 3.5-4.8 / 28-90 s1 2.8-3.5 / 35-70 2.8-3.8 / 55/2.8 Macro 1:1 (komine) / 70-150 3.8 ot (kiron) / 75-150 ot 3.8 (tokina + 2x matched)
+ i sell : OM cosina 100-500 5.6/8 |
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stevemark
Joined: 29 Apr 2011 Posts: 3930 Location: Switzerland
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Posted: Wed Oct 11, 2023 12:23 pm Post subject: |
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stevemark wrote:
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 _________________ www.artaphot.ch |
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