28-50 M vs K

**tonyzoc** · 05-20-2019, 06:11 AM

Is the 28-50 zoom K series identical to the M series. I see different review grading (though the K only has 1 review). Number of elements/groups are the same as are dimmensions. I just pick up the K version and was wondering.

D1N0 · 05-20-2019, 06:57 AM

The lens formula is the same:
K

M

But PF just used the same image in both descriptions. The only differences I can see is the K weighs 315 grams and focusses op to 55cm. The M weighs 310 grams and focusses op to 60cm. So the K variant will probably a bit longer at CFD.

**gofour3** · 05-20-2019, 08:46 AM

I have both and just the differences mentioned above. The s/n range is also different

The OEM hood is also hard to find. I had to buy the M lens just to get the hood for my K Series lens.

Phil.

Snappertim · 05-21-2019, 02:37 AM

The best web resource for Pentax is the K mount (KMP) pages (once run by Bojidar Dimitrov) for all specifications and details, do not bother with either 28-50 go for the 24-50 just as good and a bit wider at the bottom, It replaced both lens' you mention.

**tonyzoc** · 05-21-2019, 08:24 AM

Originally posted by Snappertim

The best web resource for Pentax is the K mount (KMP) pages (once run by Bojidar Dimitrov) for all specifications and details, do not bother with either 28-50 go for the 24-50 just as good and a bit wider at the bottom, It replaced both lens' you mention.

I am looking for a 24-50 but haven't found one I wanted yet. The 28-50 was cheap so I grabbed it. I've been rebuilding my M/K lenses collection recently...adding the 35/2.8, 50/4 macro, 135/3.5, 150/3.5 and 75-150/4. I'm looking to add the 28/2.8 24-50, 85/2.0, 100/2.8, 120/2.8 and 300/4... And might try to add the 20/4, 28/2 and 35/2

Snappertim · 05-22-2019, 12:25 AM

If you are going for the 20/f4 go for the early K 20mm (known as the long one) its a version of the 18mm, 3.5, 12 elements in 10 groups not the short one M series 8 elements in 8 groups and not as good.

D1N0 · 05-22-2019, 01:57 AM

Originally posted by Snappertim

If you are going for the 20/f4 go for the early K 20mm (known as the long one) its a version of the 18mm, 3.5, 12 elements in 10 groups not the short one M series 8 elements in 8 groups and not as good.

If you can find one and then it will cost as much as a modern equivalent.

05-20-2019, 06:11 AM	#1
tonyzoc Loyal Site Supporter Join Date: Jul 2018 Posts: 992	28-50 M vs K Is the 28-50 zoom K series identical to the M series. I see different review grading (though the K only has 1 review). Number of elements/groups are the same as are dimmensions. I just pick up the K version and was wondering.

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05-20-2019, 06:57 AM	#2
D1N0 Pentaxian Join Date: May 2012 Location: --- Photos: Gallery Posts: 6,802	The lens formula is the same: K M But PF just used the same image in both descriptions. The only differences I can see is the K weighs 315 grams and focusses op to 55cm. The M weighs 310 grams and focusses op to 60cm. So the K variant will probably a bit longer at CFD.

05-20-2019, 08:46 AM	#3
gofour3 Site Supporter Join Date: Oct 2008 Location: Vancouver, Canada Posts: 8,090	I have both and just the differences mentioned above. The s/n range is also different The OEM hood is also hard to find. I had to buy the M lens just to get the hood for my K Series lens. Phil.

05-21-2019, 02:37 AM	#4
Snappertim Forum Member Join Date: Jul 2014 Posts: 88	The best web resource for Pentax is the K mount (KMP) pages (once run by Bojidar Dimitrov) for all specifications and details, do not bother with either 28-50 go for the 24-50 just as good and a bit wider at the bottom, It replaced both lens' you mention.

05-21-2019, 08:24 AM	#5
tonyzoc Loyal Site Supporter Join Date: Jul 2018 Posts: 992 Original Poster	Originally posted by Snappertim The best web resource for Pentax is the K mount (KMP) pages (once run by Bojidar Dimitrov) for all specifications and details, do not bother with either 28-50 go for the 24-50 just as good and a bit wider at the bottom, It replaced both lens' you mention. I am looking for a 24-50 but haven't found one I wanted yet. The 28-50 was cheap so I grabbed it. I've been rebuilding my M/K lenses collection recently...adding the 35/2.8, 50/4 macro, 135/3.5, 150/3.5 and 75-150/4. I'm looking to add the 28/2.8 24-50, 85/2.0, 100/2.8, 120/2.8 and 300/4... And might try to add the 20/4, 28/2 and 35/2

05-22-2019, 12:25 AM	#6
Snappertim Forum Member Join Date: Jul 2014 Posts: 88	If you are going for the 20/f4 go for the early K 20mm (known as the long one) its a version of the 18mm, 3.5, 12 elements in 10 groups not the short one M series 8 elements in 8 groups and not as good.

05-22-2019, 01:57 AM	#7
D1N0 Pentaxian Join Date: May 2012 Location: --- Photos: Gallery Posts: 6,802	Originally posted by Snappertim If you are going for the 20/f4 go for the early K 20mm (known as the long one) its a version of the 18mm, 3.5, 12 elements in 10 groups not the short one M series 8 elements in 8 groups and not as good. If you can find one and then it will cost as much as a modern equivalent.