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thomasbest
Joined: 16 Mar 2015
Posts: 25
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 Posted: Mon Mar 16, 2015 11:29 pm Post subject: what is this marking ? |
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thomasbest wrote:
hi, just picked up a load of old lenses, m42. on a couple at the base they can switch from M to A. what does that mean?
cheers |
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marcusBMG
Joined: 07 Dec 2012
Posts: 1318
Location: Conwy N Wales
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| Posted: Mon Mar 16, 2015 11:42 pm Post subject: |
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marcusBMG wrote:
http://www.instructables.com/id/M42-Lens-Aperture-Control-on-Modern-DSLRs/step2/Switchable-Automatic-Manual-Apertures/
_________________
pentax ME super (retired)
Pentax K3-ii; pentax K-S2; Samsung NX 20; Lumix G1 + adapters;
Adaptall collection (proliferating!) inc 200-500mm 31A, 300mm f2.8, 400mm f4.
Primes: takumar 55mm; smc 28mm, 50mm; kino/komine 28mm f2's, helios 58mm, Tamron Nestar 400mm, novoflex 400mm, Vivitar 135mm close focus, 105mm macro; Jupiter 11A; CZJ 135mm.
A classic zoom or two: VS1 (komine), Kiron Zoomlock... |
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blotafton
Joined: 08 Aug 2013
Posts: 1631
Location: Sweden
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| Posted: Mon Mar 16, 2015 11:43 pm Post subject: |
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blotafton wrote:
Hi, M is manual aperture and A is automatic, but the latter only works on film cameras. |
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thomasbest
Joined: 16 Mar 2015
Posts: 25
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| Posted: Mon Mar 16, 2015 11:49 pm Post subject: |
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thomasbest wrote:
thanks, thought that, so all the lenses with this should be set to M? thanks, cant wait to get out and try them. |
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blotafton
Joined: 08 Aug 2013
Posts: 1631
Location: Sweden
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| Posted: Tue Mar 17, 2015 12:06 am Post subject: |
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blotafton wrote:
If your adapter has a flange that depress the aperture pin, it doesn't matter, otherwise you need to set them to M. |
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blotafton
Joined: 08 Aug 2013
Posts: 1631
Location: Sweden
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| Posted: Tue Mar 17, 2015 12:11 am Post subject: |
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blotafton wrote:
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thomasbest
Joined: 16 Mar 2015
Posts: 25
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| Posted: Tue Mar 17, 2015 12:38 am Post subject: |
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thomasbest wrote:
Hi, thanks, yes it does. |
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Lightshow
Joined: 04 Nov 2011
Posts: 3666
Location: Calgary
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| Posted: Tue Mar 17, 2015 12:59 am Post subject: |
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Lightshow wrote:
Just use a bit of caution when mounting a new lens that nothing binds, the later Takumars have been known to rub against the opening in the adapter and cause either the aperture and or the focus ring to bind, the cure was to file the adapter's opening. |
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