135mm f2.8 A vs F

cali92rs · 05-27-2016, 05:23 PM

Is there any difference in the optical formula in these 2 lenses? (135mm f2.8 A and F)

Thanks!

**jatrax** · 05-27-2016, 06:09 PM

Pentax-A = 4 elements in 4 groups
Pentax-F = 8 elements in 7 groups

At least according to the lens database.
SMC Pentax-A 135mm F2.8 Reviews - A Prime Lenses - Pentax Lens Reviews & Lens Database
SMC Pentax-F 135mm F2.8 [IF] Reviews - F Prime Lenses - Pentax Lens Reviews & Lens Database

cali92rs · 05-27-2016, 07:41 PM

Originally posted by jatrax

Pentax-A = 4 elements in 4 groups
Pentax-F = 8 elements in 7 groups

At least according to the lens database.
SMC Pentax-A 135mm F2.8 Reviews - A Prime Lenses - Pentax Lens Reviews & Lens Database
SMC Pentax-F 135mm F2.8 [IF] Reviews - F Prime Lenses - Pentax Lens Reviews & Lens Database

Doh, didnt even think to check that out.
Thanks!

**UncleVanya** · 05-27-2016, 07:48 PM

FA is also internal focus.

**jatrax** · 05-27-2016, 08:51 PM

Originally posted by cali92rs

Doh, didnt even think to check that out.

No worries, to be honest if someone had asked I would have said they were the same if I had not checked. Guess I figured Pentax had been making 135mm lenses for so long they had it figured out. Wonder what the DFA 135mm f/2.8 will be like

ultraviolet · 05-27-2016, 09:53 PM

Originally posted by jatrax

Wonder what the DFA 135mm f/2.8 will be like

FA 135 with a green or red ring and WR and high price tag

**stemked** · 05-28-2016, 06:03 AM

I have the 128 f2.8 A lens. It's actually a very nice lens, very sharp actually, even wide open.

05-27-2016, 05:23 PM	#1
cali92rs Veteran Member Join Date: May 2011 Location: Long Beach, CA Posts: 3,354	135mm f2.8 A vs F Is there any difference in the optical formula in these 2 lenses? (135mm f2.8 A and F) Thanks!

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05-27-2016, 06:09 PM	#2
jatrax Site Supporter Join Date: May 2010 Location: Washington Cascades Photos: Gallery \| Albums Posts: 12,991	Pentax-A = 4 elements in 4 groups Pentax-F = 8 elements in 7 groups At least according to the lens database. SMC Pentax-A 135mm F2.8 Reviews - A Prime Lenses - Pentax Lens Reviews & Lens Database SMC Pentax-F 135mm F2.8 [IF] Reviews - F Prime Lenses - Pentax Lens Reviews & Lens Database

05-27-2016, 07:41 PM	#3
cali92rs Veteran Member Join Date: May 2011 Location: Long Beach, CA Posts: 3,354 Original Poster	Originally posted by jatrax Pentax-A = 4 elements in 4 groups Pentax-F = 8 elements in 7 groups At least according to the lens database. SMC Pentax-A 135mm F2.8 Reviews - A Prime Lenses - Pentax Lens Reviews & Lens Database SMC Pentax-F 135mm F2.8 [IF] Reviews - F Prime Lenses - Pentax Lens Reviews & Lens Database Doh, didnt even think to check that out. Thanks!

05-27-2016, 07:48 PM	#4
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,401	FA is also internal focus.

05-27-2016, 08:51 PM	#5
jatrax Site Supporter Join Date: May 2010 Location: Washington Cascades Photos: Gallery \| Albums Posts: 12,991	Originally posted by cali92rs Doh, didnt even think to check that out. No worries, to be honest if someone had asked I would have said they were the same if I had not checked. Guess I figured Pentax had been making 135mm lenses for so long they had it figured out. Wonder what the DFA 135mm f/2.8 will be like

05-27-2016, 09:53 PM	#6
ultraviolet Pentaxian Join Date: May 2010 Photos: Albums Posts: 687	Originally posted by jatrax Wonder what the DFA 135mm f/2.8 will be like FA 135 with a green or red ring and WR and high price tag

05-28-2016, 06:03 AM	#7
stemked Site Supporter Join Date: Feb 2009 Location: Indianapolis Photos: Gallery \| Albums Posts: 527	I have the 128 f2.8 A lens. It's actually a very nice lens, very sharp actually, even wide open.