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12-26-2009, 09:52 AM   #1
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Retro lens on k-x

Hi Pentax Forums,

I'm new here, I'm just flying through the manual right now as I picked up my camera this morning.

I've attached a legacy lens from my dad's K1000, to my understanding and one of the selling points for this camera was the ability to retro all the older k -mount lenses. I can't take a picture with the older lens attached, I've got it set to M for Manual and the MF button is in check but I still can't get any shots taken.

Please take a look at the photos attached to give you an idea of what lens I'm using (cause I don't know) and what my display is showing in the "F---" instead of the aperture distance.

Attached Images
   
12-26-2009, 04:12 PM   #2
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Have a read at this and you'll understand: https://www.pentaxforums.com/forums/pentax-beginners-corner-q/59272-shooting-...x-dslrs-f.html
If not..ask again.
You have to change a setting in the menu of the camera.
Forgot what it actually says but it's something like "allow aperture...somthing..sorry, i don't have my camera with me.
12-26-2009, 04:15 PM   #3
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Older Takumar screw mount (M42) lenses would work too but you have to get the M42 to K adapter.
12-26-2009, 06:51 PM   #4
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Thanks Gerry I didn't think my thread got generated, because I'm a new member but I checked that other thread and figured out what I needed to change.

12-26-2009, 07:23 PM   #5
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Jhilia, the old lenses (M42, Pentax-K, Pentax-M) have no electrical contacts to communicate aperture & focal length to the camera. You will need to write the aperture setting down. You can set the FL in the SR menu and that is saved in the EXIF info so, if you have more than one old lens with different FLs, you can use the EXIF info to show you which one you used.

I've got three old lenses. Here are their optimum apertures for sharpness:

Super Takumar (M42) 50/F1.4 - F4
Pentax-M 28/F2.8 - F5.6-6.7
Pentax-M 50/F1.7 - F3.4-4
12-26-2009, 07:37 PM   #6
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QuoteOriginally posted by dosdan Quote
Jhilia, the old lenses (M42, Pentax-K, Pentax-M) have no electrical contacts to communicate aperture & focal length to the camera. You will need to write the aperture setting down. You can set the FL in the SR menu and that is saved in the EXIF info so, if you have more than one old lens with different FLs, you can use the EXIF info to show you which one you used.

I've got three old lenses. Here are their optimum apertures for sharpness:

Super Takumar (M42) 50/F1.4 - F4
Pentax-M 28/F2.8 - F5.6-6.7
Pentax-M 50/F1.7 - F3.4-4
Except if you turn SR off. The exif won't record focal length even though you are still shooting the same lens.

FYI
12-27-2009, 03:20 PM   #7
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QuoteOriginally posted by jhilla Quote
Thanks Gerry, I checked that other thread and figured out what I needed to change.
Great! I hope it works out for you. Have fun!
Post some results!
12-27-2009, 03:29 PM   #8
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QuoteOriginally posted by dosdan Quote
Jhilia, the old lenses (M42, Pentax-K, Pentax-M) have no electrical contacts to communicate aperture & focal length to the camera. You will need to write the aperture setting down. You can set the FL in the SR menu and that is saved in the EXIF info so, if you have more than one old lens with different FLs, you can use the EXIF info to show you which one you used.

I've got three old lenses. Here are their optimum apertures for sharpness:

Super Takumar (M42) 50/F1.4 - F4
Pentax-M 28/F2.8 - F5.6-6.7
Pentax-M 50/F1.7 - F3.4-4
She's actually talking about the lens not working on the camera because she hasn't set the "custom settings" to "aperture ring" "permitted", that's why she was getting the F--.
She wasn't talking about entering the FL on the SR.
In any case, I hope she got it and she will be able to use MF lenses now.

12-29-2009, 09:26 AM   #9
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P.S. I'm not a "she" but thanks for the help regardless. Check out my album I posted some shots that I recently took.

Thanks
12-29-2009, 09:40 AM   #10
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QuoteOriginally posted by jhilla Quote
P.S. I'm not a "she" but thanks for the help regardless. Check out my album I posted some shots that I recently took.

Thanks
Sorry 'bout that but I took the name as a whole "jhilla"..sounded like a girl so pardon the mistake. I should have taken a look of your profile.
Pardon the mistake again.
12-29-2009, 09:45 AM   #11
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Saw your album.
Pix are looking great!
I'm glad it all worked out for you!
Enjoy the hobby!
12-29-2009, 04:19 PM   #12
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I have a bunch of old SMC prime lenses, but so far tried only the 50/1.7. Very happy with the results!

In addition to what the above linked article tells you, one quick tip - green button does metering for you. Assuming you've set up the camera properly for the lens selected (see article), once you're ready to shoot, set the desired ISO, aperture, then focus (you'll get the in-focus indicator), and press the green button. It'll select the proper exposure and you're ready to take your shot.

I love it. Ain't as hard as I thought.

Here's a sample (downsized by Flicker, I don't know how to show you a full res pic). Very low light, handheld, default camera parameters in M mode:



and the full EXIF from IrfanView:
Make - PENTAX
Model - PENTAX K-x
Orientation - Top left
XResolution - 72
YResolution - 72
ResolutionUnit - Inch
Software - K-x Ver 1.01
DateTime - 2009:12:22 09:40:46
Artist -
YCbCrPositioning - Co-Sited
Copyright -
ExifOffset - 694
ExposureTime - 1/13 seconds
FNumber - 0.00
ExposureProgram - Manual control
ISOSpeedRatings - 3200
ExifVersion - 0221
DateTimeOriginal - 2009:12:22 09:40:46
DateTimeDigitized - 2009:12:22 09:40:46
ComponentsConfiguration - YCbCr
ExposureBiasValue - 0.00
MeteringMode - Center weighted average
Flash - Flash not fired, compulsory flash mode
FocalLength - 35.00 mm
FlashPixVersion - 0100
ColorSpace - sRGB
ExifImageWidth - 4288
ExifImageHeight - 2848
InteroperabilityOffset - 54456
SensingMethod - One-chip color area sensor
FileSource - Other
SceneType - Other
CustomRendered - Normal process
ExposureMode - Manual
White Balance - Auto
FocalLengthIn35mmFilm - 52 mm
SceneCaptureType - Standard
Contrast - Hard
Saturation - Normal
Sharpness - Hard
SubjectDistanceRange - Distant view

Maker Note (Vendor): -
Mode - Auto
Quality - Best
ISO - 3200
White Balance - Auto
Lens Type - K or M Lens

Thumbnail: -
Compression - 6 (JPG)
XResolution - 72
YResolution - 72
ResolutionUnit - Inch
JpegIFOffset - 54580
JpegIFByteCount - 6682
01-06-2010, 10:22 PM   #13
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Thanks for all this info. I just got a K-x today. I bought it so I could use some of my old M lenses. Of course I have no time to read the instructions. I'll try these tips this weekend.
01-07-2010, 04:54 PM   #14
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QuoteOriginally posted by chaz Quote
Of course I have no time to read the instructions. I'll try these tips this weekend.
Haha..as some say, you get actual experience from not reading the manual!

Welcome to the forums chaz! :-)
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