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03-02-2020, 01:21 PM   #1
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K-50 with 28-80mm macro lens

Hi,

This lens the 28-80mm - i think is manual so the aperture/ f stop is not going to work, right? Quick question i had was to find out if my aperture dial / or the f- thing is working, because i just bought this k50 with a sigma adapter with sigma 28-80mm macro lens. How do i find out if aperture is working? , Well i need another lens , the focus the the 28-80 mm not so great.
Thank you.


The Pentax camera is pretty interesting, my first camera. Bought it cause of the certain images it produces

03-02-2020, 01:50 PM   #2
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We would need to know the exact name and model of the 28-80 lens. There are likely 30 or so different ones that fit Pentax. Some will be auto focus some will be auto aperture and some all manual.
03-02-2020, 03:40 PM   #3
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QuoteOriginally posted by jatrax Quote
We would need to know the exact name and model of the 28-80 lens. There are likely 30 or so different ones that fit Pentax. Some will be auto focus some will be auto aperture and some all manual.
On the front lens --- says 0 with the slash threw the zero 55 sigma zoom 28-80mm 1:3.5-5.6 11 macro / made in japan
03-02-2020, 03:44 PM   #4
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QuoteOriginally posted by jatrax Quote
We would need to know the exact name and model of the 28-80 lens. There are likely 30 or so different ones that fit Pentax. Some will be auto focus some will be auto aperture and some all manual.
This is my first Pentax camera , i have other cameras

03-02-2020, 04:10 PM   #5
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I have a k-mount version of this lens. It's an autofocus zoom. Make sure the aperture ring is clicked to the "A" setting. Then you can set aperture using the wheels on the camera body.
03-02-2020, 04:17 PM   #6
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QuoteOriginally posted by zzxxcc_penthouse Quote
On the front lens --- says 0 with the slash threw the zero 55 sigma zoom 28-80mm 1:3.5-5.6 11 macro / made in japan
Sounds like you might have this one: Sigma 28-80mm F3.5-5.6 II Macro Lens Reviews - Sigma Lenses - Pentax Lens Review Database

It appears to be an autofocus lens. And, if you set the aperture to the "A" position (you have to push in the little button next to the A to do this), the camera should stop the lens down when it shoots. Otherwise, you can set some smaller aperture (f/8 or f/11) by hand, and should be able to see the aperture blades close down. If they don't, something is wrong with the lens.

paulh beat me to it!
03-02-2020, 05:22 PM   #7
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QuoteOriginally posted by paulh Quote
I have a k-mount version of this lens. It's an autofocus zoom. Make sure the aperture ring is clicked to the "A" setting. Then you can set aperture using the wheels on the camera body.
My camera has an adapter / sigma brand , i dont think it can show aperture , the aperture on the sigma zoom lens works - 3.5.- 22 , etc - I bought it used/ and the person / seller didnt know much about it. Shows F -- on the front , not saying a f number, It is a manual focus zoom , no auto focus . . Maybe the aperture dial is not working. So, i just bought a Pentax 35 f/2.4 AL lens for the time being, when the lens comes in , ill put it on , then ill know.

Thank you
03-02-2020, 05:43 PM - 1 Like   #8
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QuoteOriginally posted by zzxxcc_penthouse Quote
My camera has an adapter / sigma brand , i dont think it can show aperture , the aperture on the sigma zoom lens works - 3.5.- 22 , etc - I bought it used/ and the person / seller didnt know much about it. Shows F -- on the front , not saying a f number, It is a manual focus zoom , no auto focus . . Maybe the aperture dial is not working. So, i just bought a Pentax 35 f/2.4 AL lens for the time being, when the lens comes in , ill put it on , then ill know.

Thank you
If its a fully manual lens, you need to go into the camera menu and "enable use of aperture ring". Then you select the aperture on the lens' aperture ring. Then you will use the green button to do "stop down metering". Follow the instructions here: Using Manual Lenses (M42 Screwmount, M , K) on Pentax DSLRs F-- - PentaxForums.com

03-02-2020, 07:18 PM   #9
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QuoteOriginally posted by zzxxcc_penthouse Quote
My camera has an adapter / sigma brand

Thank you
Curious about the Sigma adapter, can you post a pic?
03-03-2020, 06:55 AM   #10
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QuoteOriginally posted by ramseybuckeye Quote
Curious about the Sigma adapter, can you post a pic?
Yes, i can send a pic
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03-03-2020, 07:07 AM   #11
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Another image

---------- Post added 03-03-20 at 07:09 AM ----------

Images taken by a olympus omd em5 m2 with 23mm 1.4 lens

---------- Post added 03-03-20 at 07:31 AM ----------

QuoteOriginally posted by zzxxcc_penthouse Quote
Another image

---------- Post added 03-03-20 at 07:09 AM ----------
Camera used to take photos:
Lens . .. . . . . .. . .correction: Images taken by a olympus omd em5 m2 with 25 1.8 mm zuiko lens . . . . . . . . .. . .not 23 1.4 lens
25 1.8 mm zuiko lens . . . . . . . . .. . .not 23 1.4 lens
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03-03-2020, 12:10 PM   #12
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That's a tele-macro adapter. Will the lens work without that? They tend to degrade image quality and some versions of the lens already have a macro function that works very well.

Last edited by paulh; 03-03-2020 at 12:22 PM.
03-03-2020, 12:53 PM   #13
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QuoteOriginally posted by zzxxcc_penthouse Quote
Another image

---------- Post added 03-03-20 at 07:09 AM ----------

Images taken by a olympus omd em5 m2 with 23mm 1.4 lens

---------- Post added 03-03-20 at 07:31 AM ----------


25 1.8 mm zuiko lens . . . . . . . . .. . .not 23 1.4 lens
I agree with Paul, the macro teleconverter is surely the culprit here. If you press the silver button on the right side of the lens, by the word "coated" you can release the lens from the teleconverter. I think you'll find it is an autofocus lens, and it will be an improvent over the lens on the converter, but you're going to love the 35mm that you have coming.
03-03-2020, 01:39 PM - 1 Like   #14
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QuoteOriginally posted by ramseybuckeye Quote
I agree with Paul, the macro teleconverter is surely the culprit here. If you press the silver button on the right side of the lens, by the word "coated" you can release the lens from the teleconverter. I think you'll find it is an autofocus lens, and it will be an improvent over the lens on the converter, but you're going to love the 35mm that you have coming.
Took the teleconverter off , now the 28-80 3.5 sigma actually works - the autofucus works, Wonder why previous owner had it on. But the it still shows F - - on the screeen . Thanks.
03-03-2020, 01:42 PM - 1 Like   #15
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QuoteOriginally posted by zzxxcc_penthouse Quote
Took the teleconverter off , now the 28-80 3.5 sigma actually works - the autofucus works, Wonder why previous owner had it on. But the it still shows F - - on the screeen . Thanks.
The lens needs to be in the A position on the aperture ring. If it still doesnt work, clean the lens and camera contacts with a bit a alcohol.
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