Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
04-19-2009, 04:57 PM   #16
Pentaxian
cardinal43's Avatar

Join Date: Oct 2007
Location: Virginia
Photos: Gallery
Posts: 2,347
QuoteOriginally posted by Mike Cash Quote
M42 lenses on a Pentax DSLR? Easiest thing in the world.

1. Set Av mode
2. Set the auto/manual switch on your lens to "M"

Confirm that the switch is in the correct position by looking through the viewfinder and turning the aperture ring. Does the brightness of the scene change? If so, good. If not, move the switch.

Now you're ready to take pictures. Set your aperture to f4 or larger (2.8 or 2 or 1.8 etc etc) to make focusing easier.

1. Focus
2. Adjust to desired shooting aperture
3. Press the shutter button

I've done around 20,000 shots with the K100D and K20D using M42 lenses. There's nothing complicated about it.
In doing this (shooting in AV), you are not using the AE/L button at all, correct? Is this because the lens stays open because of AV? I know you shoot the K20D (I have the K100D), and things might not be the same. If you shoot in M, you have to do the AE/L button step to stop down. Am I understanding this correctly?

04-19-2009, 07:12 PM   #17
Veteran Member
wasser's Avatar

Join Date: Jan 2009
Location: northern ca
Photos: Gallery
Posts: 427
QuoteOriginally posted by cardinal43 Quote
In doing this (shooting in AV), you are not using the AE/L button at all, correct? Is this because the lens stays open because of AV? I know you shoot the K20D (I have the K100D), and things might not be the same. If you shoot in M, you have to do the AE/L button step to stop down. Am I understanding this correctly?
QuoteOriginally posted by wasser Quote
On the km/k2000, automatic stop down metering does not work on m42 mount (screwmount), or for any Pentax DSLR afaik. This is due to the fact that the body cannot communicate or control the lens.
DSLR + M42 = no automatic stop-down metering

The aperture on these lenses is manually set and moved from the lens itself; spin the aperture and you watch the blades move. The lens doesn't "stay open because of AV", it's at what ever it's been manually set to.

With Av mode you skip having to meter because the camera is adjusting the shutter speed in real time.
04-19-2009, 07:26 PM   #18
Pentaxian
cardinal43's Avatar

Join Date: Oct 2007
Location: Virginia
Photos: Gallery
Posts: 2,347
QuoteOriginally posted by wasser Quote
DSLR + M42 = no automatic stop-down metering

The aperture on these lenses is manually set and moved from the lens itself; spin the aperture and you watch the blades move. The lens doesn't "stay open because of AV", it's at what ever it's been manually set to.

With Av mode you skip having to meter because the camera is adjusting the shutter speed in real time.

Thanks for the info.
04-22-2009, 12:51 PM   #19
Forum Member




Join Date: Mar 2009
Location: LA
Posts: 80
Original Poster
QuoteOriginally posted by wasser Quote
DSLR + M42 = no automatic stop-down metering

The aperture on these lenses is manually set and moved from the lens itself; spin the aperture and you watch the blades move. The lens doesn't "stay open because of AV", it's at what ever it's been manually set to.

With Av mode you skip having to meter because the camera is adjusting the shutter speed in real time.

yep, the camera adjusts shutter speed in real time, but very often results come out under-exposed, so I am using EV +1.5 or 2.

04-22-2009, 04:19 PM   #20
Veteran Member
wasser's Avatar

Join Date: Jan 2009
Location: northern ca
Photos: Gallery
Posts: 427
QuoteOriginally posted by wasser Quote
Av mode:

My Km was always 2 stops off in Av mode. However, Av mode works, but you'll either have to short the data pin (it's the pin at the bottom near the screw onthe body) or use Ev compensation to get correct metering. Once you've either shorted the pin or set Ev compensation you simply:

Adjust aperture
Shoot
QuoteOriginally posted by grishazzz Quote
yep, the camera adjusts shutter speed in real time, but very often results come out under-exposed, so I am using EV +1.5 or 2.
Yup, and that's why earlier in this thread I posted this:

QuoteOriginally posted by wasser Quote
Av mode:

My Km was always 2 stops off in Av mode. However, Av mode works, but you'll either have to short the data pin (it's the pin at the bottom near the screw onthe body) or use Ev compensation to get correct metering. Once you've either shorted the pin or set Ev compensation you simply:

Adjust aperture
Shoot


I forgot to add that there are different ways to short the pin. I personally just keep a piece of aluminum foil in my cleaning kit. When I need it I just slide it between the lens and the pin as I screw the lens on.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
aperture, button, camera, ev, exposure, help, lens, pentax help, photography, press, value
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pentax K2000 No Manual Control pearsonbe Pentax DSLR Discussion 6 02-01-2011 11:54 AM
K2000 Manual Lens Metering Problem gomuppets Troubleshooting and Beginner Help 15 09-30-2009 06:29 PM
K2000 Manual Operation Questions raymeedc Pentax DSLR Discussion 2 04-27-2009 12:31 PM
K2000, manual lens, and Av mode SOldBear Pentax DSLR Discussion 10 03-19-2009 09:49 AM
Stopping down manual lenses on k2000? eyou Pentax DSLR Discussion 12 02-22-2009 02:05 AM



All times are GMT -7. The time now is 10:31 PM. | See also: NikonForums.com, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top