Forskel på Pentax A og M Obektiv?

jespernr · 05-17-2010, 12:02 PM

Hej.

Jeg har et Pentax K10D og overvejer at købe et brugt analogt 50 mm. objektiv.

Jeg har set på et Pentax - M 1:1.7 50mm og et Pentax - A 1:1.7 50mm.

Er der nogen som kan forklare hvad forskellen på A og M er?

captainslack · 05-17-2010, 12:10 PM

I would suggest getting the A lens. The optics are probably the same on both, but the difference is in that cameras control of the aperature setting. With the A lens, your K10D will recognize the aperature & adjust metering accordingly. It won't recognized the change in aperature with the M lens.

Adam · 05-17-2010, 12:20 PM

See here: Pentax K-Mount Lenses Explained

The essential difference is that the A version allows for auto aperture control wile the M doesn't; both lenses are manual focus.

Pablom · 05-17-2010, 12:33 PM

effectively with the A lens you can do everything the same as any modern lens except for no AF.
With the M lens it's a little more complicated than that and I'll leave the explanations for someone else for I suspect I will confuse you

jespernr · 05-17-2010, 12:42 PM

Tak for svarene :-) Jeg vil gå efter en A-er

freewheeler · 05-18-2010, 11:44 AM

I have both.
Big difference: multi-pattern-metering versus centre-weigth.
Small difference: better coating; tiny bit sharper.
Both little nice lenses, mechanical and optical.
Since I don't like to change body-adjustments all the time I use the m50 in combination
with other m and K lenses when time is not an issue and the A in combination with the
other AE lenses.

05-17-2010, 12:02 PM	#1
jespernr New Member Join Date: May 2010 Posts: 2	[langtitle=da]Forskel på Pentax A og M Obektiv?[/langtitle] Hej. Jeg har et Pentax K10D og overvejer at købe et brugt analogt 50 mm. objektiv. Jeg har set på et Pentax - M 1:1.7 50mm og et Pentax - A 1:1.7 50mm. Er der nogen som kan forklare hvad forskellen på A og M er?

05-17-2010, 12:20 PM	#3
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,594	See here: Pentax K-Mount Lenses Explained The essential difference is that the A version allows for auto aperture control wile the M doesn't; both lenses are manual focus. Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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05-17-2010, 12:10 PM	#2
captainslack Junior Member Join Date: Oct 2009 Location: NC Posts: 40	I would suggest getting the A lens. The optics are probably the same on both, but the difference is in that cameras control of the aperature setting. With the A lens, your K10D will recognize the aperature & adjust metering accordingly. It won't recognized the change in aperature with the M lens.

05-17-2010, 12:33 PM	#4
Pablom Veteran Member Join Date: Feb 2010 Location: Usa Posts: 1,940	effectively with the A lens you can do everything the same as any modern lens except for no AF. With the M lens it's a little more complicated than that and I'll leave the explanations for someone else for I suspect I will confuse you

05-17-2010, 12:42 PM	#5
jespernr New Member Join Date: May 2010 Posts: 2 Original Poster	Tak for svarene :-) Jeg vil gå efter en A-er

05-18-2010, 11:44 AM	#6
freewheeler Senior Member Join Date: Oct 2009 Location: amsterdam Posts: 130	I have both. Big difference: multi-pattern-metering versus centre-weigth. Small difference: better coating; tiny bit sharper. Both little nice lenses, mechanical and optical. Since I don't like to change body-adjustments all the time I use the m50 in combination with other m and K lenses when time is not an issue and the A in combination with the other AE lenses.

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