How does autofocus on the 28-105 compare to other modern Pentax lenses?

normhead · 01-24-2023, 06:43 AM

I prefer 70mm on APS-c. 85mm should be great on FF. But I wouldn't know, I don't have an 85. Increasing the distance flattens big noses. Using standard or wide angle makes them bigger.The 55 1.4 should be perfect on APS-c, except for the part where the 85 will have much smoother bokeh.

mikesbike · 01-24-2023, 07:24 PM

The OP is shooting with the K-1 II.

**Papa_Joe** · 01-30-2023, 01:59 AM

Originally posted by pblogic

For normal use of static or slow moving subjects I don't have an issue with the auto-focus. I'm specifically speaking to sports photography. When tracking players with AFC the older lenses I have can't keep up with the DFA 28-105MM which does a marvelous job honestly, but I need a faster aperture. When I'm shooting at 105mm at 5.6 I have to push the ISO too far for good images.

Outside of dealing with sports, I don't have any issue with any of my lenses.

Thank you for clarifying!
I never used the K-1 for fast moving subjects, thus I did not have the experience.
Now it is all clear to me and a very important information as at current I am thinking to buy the 28-105.

pblogic · 01-30-2023, 03:46 PM

Originally posted by Papa_Joe

Thank you for clarifying!
I never used the K-1 for fast moving subjects, thus I did not have the experience.
Now it is all clear to me and a very important information as at current I am thinking to buy the 28-105.

Honestly I am really impressed with the 28-105. It's sharp, the auto focus is fast and very quiet, and it produces great images. It is MUCH better than any other "kit" lens I have ever used. When I got my K20D 15 years ago it came with the 18-55 and that was never a really good lens. I got some good shots out of it, but had to work hard. The 28-105 is in a different league in my opinion.

The only downside is the relatively slow aperture. You aren't going to be getting great low light shots, or super creamy bokeh with it, but that's not really what it's made for anyway. If the aperture is fast enough for you, it's really a nice walk around lens, if you're using it in good lighting. Throw it all on a mono pod and take it for a walk in the woods on a bright sunny day and it's going to be a ton of fun.

Check out KEH and MPB, and even Amazon for used lenses, you might be able to pick it up for much cheaper than it's MSRP.

Good luck!

Last edited by pblogic; 01-30-2023 at 06:49 PM.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
How well does the 16-85 compare with the 28-105?	BWG	Pentax SLR Lens Discussion	15	10-13-2021 05:12 AM
D FA28-105 vs the other 3 Pentax 28-105 lenses	Docrwm	Pentax SLR Lens Discussion	47	06-12-2021 03:03 PM
How does Pentax AF-C compare to other brands?	clackers	Pentax DSLR Discussion	113	03-29-2019 02:40 AM
NiSi V5 Pro compare Breakthrough compare...	gatorguy	Pentax Camera and Field Accessories	3	01-31-2018 12:19 PM
How does the Q compare to my other cameras	hnikesch	Pentax Q	4	11-11-2012 03:46 PM

01-24-2023, 06:43 AM	#31
normhead Pentaxian Join Date: Jun 2007 Location: Near Algonquin Park Photos: Gallery \| Albums Posts: 40,420	I prefer 70mm on APS-c. 85mm should be great on FF. But I wouldn't know, I don't have an 85. Increasing the distance flattens big noses. Using standard or wide angle makes them bigger.The 55 1.4 should be perfect on APS-c, except for the part where the 85 will have much smoother bokeh.

01-24-2023, 07:24 PM	#32
mikesbike Pentaxian Join Date: Dec 2016 Location: Southeastern Michigan Posts: 4,321	The OP is shooting with the K-1 II.

01-30-2023, 01:59 AM	#33
Papa_Joe Site Supporter Join Date: Sep 2018 Location: SW Bavaria Posts: 448	Originally posted by pblogic For normal use of static or slow moving subjects I don't have an issue with the auto-focus. I'm specifically speaking to sports photography. When tracking players with AFC the older lenses I have can't keep up with the DFA 28-105MM which does a marvelous job honestly, but I need a faster aperture. When I'm shooting at 105mm at 5.6 I have to push the ISO too far for good images. Outside of dealing with sports, I don't have any issue with any of my lenses. Thank you for clarifying! I never used the K-1 for fast moving subjects, thus I did not have the experience. Now it is all clear to me and a very important information as at current I am thinking to buy the 28-105.

01-30-2023, 03:46 PM	#34
pblogic Forum Member Join Date: Sep 2009 Location: Illinois, USA Posts: 66 Original Poster	Originally posted by Papa_Joe Thank you for clarifying! I never used the K-1 for fast moving subjects, thus I did not have the experience. Now it is all clear to me and a very important information as at current I am thinking to buy the 28-105. Honestly I am really impressed with the 28-105. It's sharp, the auto focus is fast and very quiet, and it produces great images. It is MUCH better than any other "kit" lens I have ever used. When I got my K20D 15 years ago it came with the 18-55 and that was never a really good lens. I got some good shots out of it, but had to work hard. The 28-105 is in a different league in my opinion. The only downside is the relatively slow aperture. You aren't going to be getting great low light shots, or super creamy bokeh with it, but that's not really what it's made for anyway. If the aperture is fast enough for you, it's really a nice walk around lens, if you're using it in good lighting. Throw it all on a mono pod and take it for a walk in the woods on a bright sunny day and it's going to be a ton of fun. Check out KEH and MPB, and even Amazon for used lenses, you might be able to pick it up for much cheaper than it's MSRP. Good luck! Last edited by pblogic; 01-30-2023 at 06:49 PM.

Thread Tools	Search this Thread
	Search this Thread: Advanced Search