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05-13-2012, 03:07 AM   #1
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Lens compatibilty

Hi,

My MZ-50 has packed up and I am looking at buying the K-r. The question is, will the MZ-50 lenses work with the K-r?

05-13-2012, 03:45 AM   #2
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Yep, they will.
05-13-2012, 09:00 AM   #3
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Tks, thats great!
05-13-2012, 04:26 PM   #4
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Should work great you will see a difference in angle of view as the image sensor is smaller than 35mm film. Your normal (50mm) lens will look and work like a 75mm on the Kr, a 100mm will be a 150mm and so on. They will otherwise work great. They will work exactly like they did on the MZ-50 except angle of view

Hans

05-13-2012, 04:39 PM   #5
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QuoteOriginally posted by hnikesch Quote
Should work great you will see a difference in angle of view as the image sensor is smaller than 35mm film. Your normal (50mm) lens will look and work like a 75mm on the Kr, a 100mm will be a 150mm and so on. They will otherwise work great. They will work exactly like they did on the MZ-50 except angle of view
Well, sort of. A 50mm lens on an APS dSLR like the Kr will have the angle of view (AOV) similar to a 75mm lens on a 135/FF SLR like the MZ-50, but the depth of field (DOF) will differ. It's more like: 50/1.4 on APS is about AOV+DOF equivalent to 75/2 on FF.

I point this out because too many people moving to half-frame dSLRs from full-frame film SLRs seem to think that the lens changes, that a 50mm becomes a 75mm. It doesn't. Moving a lens between cameras neither stretches nor shrinks it. Different-size frames (film or sensor) just see different amounts of the projected image, is all.
05-14-2012, 10:58 AM   #6
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With most shots, you don't even have to think about this aspect of using a FF lens on an APS-C sensor. I have both metering and focus on the center. So I point directly at my primary subject and (focus if doing it manually) press the shutter half-way to meter (and focus if using auto-focus), recompose and shoot. I switched my Green Button to preview depth of field when it is critical. By the way, I also bounce around between many of the K-r's exposure options depending on what I am trying to achieve.
05-14-2012, 12:56 PM   #7
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You are confusing this old man. I assume that using a 200 f4 pentax M manual focus on my K-r will produce a 300 mm angle of view but still the 200 DOF?
Any advice is greatly appreciated as I am new to digital. I just wish that I would not have sold all my pentax manual focus stuff years ago.
If I can pick up some M manual focus lenses at the right price, do you think they are effective on the K-r?
05-14-2012, 12:58 PM   #8
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QuoteOriginally posted by mdodrill Quote
If I can pick up some M manual focus lenses at the right price, do you think they are effective on the K-r?
Yes.

05-14-2012, 01:09 PM   #9
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QuoteOriginally posted by mdodrill Quote
You are confusing this old man. I assume that using a 200 f4 pentax M manual focus on my K-r will produce a 300 mm angle of view but still the 200 DOF?
Any advice is greatly appreciated as I am new to digital. I just wish that I would not have sold all my pentax manual focus stuff years ago.
If I can pick up some M manual focus lenses at the right price, do you think they are effective on the K-r?
You understand this Full Frame to APS-C translation just fine.

I will politely suggest that rather than look for M series lenses, you look for A series or newer. Unless the K-r sees an A series or newer lens, it will not give you an F/stop value either on the LCD or in the viewfinder. All you'll see is "F - - -". This makes full manual metering with a M series lens rather cumbersome. While there is a way to fool your K-r into thinking all lenses are at least A series (look around in the K-r part of the Forum), life is just a lot simpler if you have actual A series or better lenses.

I kept my K-A Pentax lenses when I upgraded from my Super Program to the K-r. While I use the kit lens quite often, I do still like using my manual focus lenses for some situations.
05-14-2012, 01:42 PM   #10
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QuoteOriginally posted by JimJohnson Quote
You understand this Full Frame to APS-C translation just fine.

I will politely suggest that rather than look for M series lenses, you look for A series or newer. Unless the K-r sees an A series or newer lens, it will not give you an F/stop value either on the LCD or in the viewfinder. All you'll see is "F - - -". This makes full manual metering with a M series lens rather cumbersome. While there is a way to fool your K-r into thinking all lenses are at least A series (look around in the K-r part of the Forum), life is just a lot simpler if you have actual A series or better lenses.

I kept my K-A Pentax lenses when I upgraded from my Super Program to the K-r. While I use the kit lens quite often, I do still like using my manual focus lenses for some situations.
Thanks...I guess it was a good idea to sell those M's
05-14-2012, 01:48 PM   #11
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QuoteOriginally posted by mdodrill Quote
You are confusing this old man. I assume that using a 200 f4 pentax M manual focus on my K-r will produce a 300 mm angle of view but still the 200 DOF?
Sort of. Here is how I work zone-focus with FF lenses on APS-C cameras: I'll mount an FF lens onto my K20D. I'll set the aperture to f/11. I'll read the on-lens DOF scale at the f/8 marks. If I want to hyperfocus, where one zone extends to infinity, I'll be a bit more paranoid, and adjust the reading by about 1.3 stops. So if the aperture is at f/11, I'll read the DOF scale *inside* the f/8 marks, say around f/7. Then I can be *sure* that infinity is in focus.

QuoteQuote:
Any advice is greatly appreciated as I am new to digital. I just wish that I would not have sold all my pentax manual focus stuff years ago.
"Oh, who needs THAT old stuff?!?!?" [sigh...] Yeah, I wish I'd kept my old film gear too. Instead, I thought I'd be using digital P&S and vidcams forever, so all my cameras, lenses, darkroom gear were donate to a deserving student. Duh...

QuoteQuote:
If I can pick up some M manual focus lenses at the right price, do you think they are effective on the K-r?
Yes, very. M-types require a different discipline than presets, A-type and AF, and adapted lenses, but they're quite usable -- I have a couple dozen of them. Of manual focus PK lens lines, you'll find these generalizations:

* K-type: big, heavy, desired, more metal
* M-type: small, less desired, less expensive
* A-type: easier to use, more expensive, more plastic

K-types have the same mechanisms as M-types but with many Takumar optical formulas. M-types tend to be the best bargains of these.
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