F16 vs. f1.4 DFA* 50

Wheatfield · 07-30-2018, 08:51 AM

Originally posted by travelour

Now, I have to search the forum for a comparison of the FA 85 the DFA 50. Trying to figure out which toy will burn the next hole in my wallet.

I'm betting a D FA* 85/1.4 is nearing the horizon. Get the 50 now and the 85 when it comes out. That's my plan.

**pres589** · 07-30-2018, 09:05 AM

Originally posted by SSGGeezer

Even though I shoot APSC, am I going to have to get another job so I can pay for my LBA?

50's are cooler on crop anyway.

johnkrumm · 07-30-2018, 10:31 AM

I'm waiting more for the 20mm or 35mm (I forget if a 35 is on the map).

Dericali · 07-31-2018, 01:08 AM

Originally posted by johnkrumm

Three issues were at play. Very low depth of field, a very dark face with bright white fur in other areas, and typical dog movement. In this case I had better luck focusing on her eye with live view. Sometimes contrast detect can be more precise.

Were you using focus peaking? I read a comment somewhere about Pentax autofocus' system being limited to f2.8... does the DOF line on focus peaking at f1.4 look thinner than at f2.8 or is it the same? I'm curious to know.

**clackers** · 07-31-2018, 01:27 AM

Originally posted by Dericali

Were you using focus peaking? I read a comment somewhere about Pentax autofocus' system being limited to f2.8...

Canon and Nikon are the same - the best points like the central points are rated to f2.8, the others to f5.6

Dericali · 07-31-2018, 02:02 AM

Originally posted by clackers

Canon and Nikon are the same - the best points like the central points are rated to f2.8, the others to f5.6

Interesting. Does that mean that focus peaking can not be more 'accurate' than f2.8 on those cameras too?

**clackers** · 07-31-2018, 03:54 AM

Originally posted by Dericali

Interesting. Does that mean that focus peaking can not be more 'accurate' than f2.8 on those cameras too?

Focus peaking doesn't use the AF points at all, Dericali!

johnkrumm · 07-31-2018, 05:50 AM

Originally posted by Dericali

Were you using focus peaking? I read a comment somewhere about Pentax autofocus' system being limited to f2.8... does the DOF line on focus peaking at f1.4 look thinner than at f2.8 or is it the same? I'm curious to know.

No, I used live view autofocus, single point. If I use live view manual focus, I like 16x magnified view without peaking.

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07-30-2018, 08:51 AM	#16
Wheatfield Moderator Join Date: Apr 2008 Location: The wheatfields of Canada Posts: 15,975	Originally posted by travelour Now, I have to search the forum for a comparison of the FA 85 the DFA 50. Trying to figure out which toy will burn the next hole in my wallet. I'm betting a D FA* 85/1.4 is nearing the horizon. Get the 50 now and the 85 when it comes out. That's my plan.

07-30-2018, 09:05 AM	#17
pres589 Site Supporter Join Date: Jan 2014 Location: Wichita, KS Photos: Albums Posts: 4,529	Originally posted by SSGGeezer Even though I shoot APSC, am I going to have to get another job so I can pay for my LBA? 50's are cooler on crop anyway.

07-30-2018, 10:31 AM	#18
johnkrumm Senior Member Join Date: May 2016 Location: Duluth, MN Posts: 141 Original Poster	I'm waiting more for the 20mm or 35mm (I forget if a 35 is on the map).

07-31-2018, 01:08 AM	#19
Dericali Senior Member Join Date: Jul 2016 Location: Berlin Posts: 298	Originally posted by johnkrumm Three issues were at play. Very low depth of field, a very dark face with bright white fur in other areas, and typical dog movement. In this case I had better luck focusing on her eye with live view. Sometimes contrast detect can be more precise. Were you using focus peaking? I read a comment somewhere about Pentax autofocus' system being limited to f2.8... does the DOF line on focus peaking at f1.4 look thinner than at f2.8 or is it the same? I'm curious to know.

07-31-2018, 01:27 AM	#20
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by Dericali Were you using focus peaking? I read a comment somewhere about Pentax autofocus' system being limited to f2.8... Canon and Nikon are the same - the best points like the central points are rated to f2.8, the others to f5.6

07-31-2018, 02:02 AM	#21
Dericali Senior Member Join Date: Jul 2016 Location: Berlin Posts: 298	Originally posted by clackers Canon and Nikon are the same - the best points like the central points are rated to f2.8, the others to f5.6 Interesting. Does that mean that focus peaking can not be more 'accurate' than f2.8 on those cameras too?

07-31-2018, 03:54 AM	#22
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by Dericali Interesting. Does that mean that focus peaking can not be more 'accurate' than f2.8 on those cameras too? Focus peaking doesn't use the AF points at all, Dericali!

07-31-2018, 05:50 AM	#23
johnkrumm Senior Member Join Date: May 2016 Location: Duluth, MN Posts: 141 Original Poster	Originally posted by Dericali Were you using focus peaking? I read a comment somewhere about Pentax autofocus' system being limited to f2.8... does the DOF line on focus peaking at f1.4 look thinner than at f2.8 or is it the same? I'm curious to know. No, I used live view autofocus, single point. If I use live view manual focus, I like 16x magnified view without peaking.

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