Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-11-2018, 02:32 PM   #16
Pentaxian
RAART's Avatar

Join Date: Apr 2013
Location: Oakville, ON
Photos: Gallery
Posts: 1,095
Get a used F50 1.7 and I do not think that you can even get better even up to 500$. Also look at that cat pictures above... gorgeous.
I have DA50 1.8 and Sigma DG EX 50mm 1.4 HSM. Sigma is better but not for so much than DA50mm but also more expensive but if Sigma fits your budget than go for it.

02-11-2018, 02:52 PM   #17
Loyal Site Supporter
Loyal Site Supporter
UncleVanya's Avatar

Join Date: Jul 2014
Photos: Gallery | Albums
Posts: 15,199
I own the f 50 f1.7 myself. Good lens, but on a k-1 the roughly 1 2/3 stop difference is probably not huge on that camera. DOF will be shallower - sometimes maybe too shallow. However focus acquisition should be much faster since you won't have the "macro miss".
02-11-2018, 02:59 PM   #18
Forum Member




Join Date: Sep 2017
Location: Atlanta
Photos: Albums
Posts: 91
I'll chime in with another recommendation for the F 50/1.7. Cheap (mine was $80 on ebay), tiny, sharp, very nice rendering, and fast accurate AF on the K-1.

The F 50/1.7 and the DA 50/1.8 appear to have nearly identical optical formulas. Fast 50s have been a solved problem for decades. The diagrams look very similar to the formulas for the 55/1.8 Takumars dating back to the late 1950s, even (which are also still nice lenses!). Coatings have gotten better over the decades, but I'd just get whichever I found the best price on.

The F has a metal mount and the DA is all-plastic, which was an influential factor for me, but I'd have jumped on a DA 50 for the right deal.
02-11-2018, 04:36 PM   #19
Pentaxian
Wheatfield's Avatar

Join Date: Apr 2008
Location: The wheatfields of Canada
Photos: Albums
Posts: 11,255
QuoteOriginally posted by Craigbob Quote
The DA 1.8 vs the F 1.7 which do you think is better? I have seen the 1.7 in my price range on e-bay.
Pardon me, I meant the F 50/1.7. It is designed for the full 35mm image circle, the DA isn't. I had an F50/1.7 for many, many years. It was excellent. I let an ex-girlfriend talk me out of it.
I have absolutely no experience with the DA lens.

02-11-2018, 06:03 PM   #20
Pentaxian




Join Date: Nov 2007
Location: Western Canada
Posts: 5,569
I've got a Pentax D FA 50 Macro F 2.8 and a FA 50 F 1.4. Both good lenses. I realize that you want faster than an F 2.8, but my question is why ? I find F 2.8 provides ok Bokeh and good clarity of the subject. My 50mm F 1.4 is of course faster, but I don't use it at F 1.4...in fact I find F 2.2 plus...more to my liking. Depth of field is pretty narrow at F 1.4, F 1.8, etc.

I got my F 1.4 first and you know, if I were to do things all over again, I don't think I would get the F 1.4. It's a good lens, but to be honest I feel I have too many 50's. In retrospect I would just get one 50mm if I were to do things all over again and that 50 would be the 50 Macro F 2.8. I'd sacrifice some speed, but I would more than compensate with the macro function and considering both are 50's...the portraits with both are nice and sharp.

Another lens that I have that is within striking distance of a 50, is my 40mm F 2.8 Limited. It is an ASP-C lens but it seems to work very well on my K-1. I really like the sheer quality, clarity and 'look' of pictures from this lens. It is exceptional IMO.

It's not an easy question to answer and as always we have to do/decide what is right for us, individually. Maybe you might want to give your Sigma 50 Macro another look.
02-11-2018, 07:02 PM   #21
Pentaxian




Join Date: Dec 2016
Posts: 1,681
You mention low-light as a need, which spells a fast lens, and you want AF. I'll add my vote for the suggested "F" 50mm f/1.7 which gives good results, even wide open. It is well-made, so if you find one in good shape, you will be impressed. It's screw-driven AF is fast and accurate on the camera bodies I've used it. If you also own a Pentax APS-C DSLR, it makes a very fine portrait lens with its 50mm FL and f/1.7 capability. I think Pentax did make the same lens, same optics, in the FA style body later, which might cost more used. It is also well-made, but somehow the earlier F body feels more rugged, although just as small.
02-12-2018, 01:29 AM   #22
Site Supporter
Site Supporter




Join Date: Nov 2014
Location: Auckland
Posts: 246
QuoteOriginally posted by Craigbob Quote
I would like to stay below $200.00 on the lens, so the DA* 55 1.4 while desired, is out of the question.
I sold my F50 1.7 when I got the DA*55. The difference in IQ was night and day to my eyes. I got mine for $250 so just beyond your budget, but considering the upcoming DFA50 1.4 in the $1000 and up range the DA*55 will be seen as a budget lens.
02-12-2018, 11:36 AM   #23
Loyal Site Supporter
Loyal Site Supporter




Join Date: Mar 2017
Location: Corona, CA
Photos: Albums
Posts: 243
Original Poster
Thanks all. I found a few 50mm F 1.7s online including one for a ridiculosly low price and I have a bid on it. the auction ends in something like 5 days so I'm hoping no one comes and bids it up.

There are a few at the Buy-it-Now price of around $100-125 that I'll get if I don't win the aution.

02-12-2018, 03:41 PM   #24
Pentaxian
angerdan's Avatar

Join Date: Feb 2015
Photos: Albums
Posts: 1,004
QuoteOriginally posted by Craigbob Quote
  1. I am looking for a faster lens.
  2. Would I really be able to tell the difference between a 50mm1.4, 1.7,1.8 or my current 2.8 (which I am looking to replace with a Pentax AF version.).
  3. I would like to stay below $200.00 on the lens, so the DA* 55 1.4 while desired, is out of the question.
  4. What is the opinion of the DA 50 vs the FA 50 vs the 50 2.8 macro?
  1. faster aperture, faster AF or booth?
  2. difference about what?
  3. get the DA 50mm 1.8
  4. DA 50: Best budget lens - FA 50: there are three - D FA 50: too short focal length for Macro
Since the lens is the most important part of a camera system, i'd recommend to reconsider the budget.
<= F1.9 Prime Lenses between 43mm and 55mm with Autofocus | PentaxForums.com

The D FA* 50mm SDM AW is already on the roadmap for spring 2018.
HD Pentax D FA? 50mm F1.4 Coming Soon - Pentax Announcements | PentaxForums.com
02-12-2018, 04:05 PM   #25
Site Supporter
Site Supporter
pres589's Avatar

Join Date: Jan 2014
Location: Lawrence, KS
Photos: Albums
Posts: 2,398
I've got an M 50 1.4, an F 50 1.7, and a DA 50 1.8. I prefer the 1.8 unless I want to play with thin depth of field and that goes to the M 50 1.4. I should sell the F 50 1.7; it's a decent lens but does nothing better than the DA and I think the out of focus rendering is a bit nicer with the DA. The DA is also a lot lighter weight which I think is a bonus.
02-12-2018, 05:31 PM   #26
Loyal Site Supporter
Loyal Site Supporter




Join Date: Mar 2017
Location: Corona, CA
Photos: Albums
Posts: 243
Original Poster
QuoteOriginally posted by angerdan Quote
  1. faster aperture, faster AF or booth?
  2. difference about what?
  3. get the DA 50mm 1.8
  4. DA 50: Best budget lens - FA 50: there are three - D FA 50: too short focal length for Macro
Since the lens is the most important part of a camera system, i'd recommend to reconsider the budget.
<= F1.9 Prime Lenses between 43mm and 55mm with Autofocus | PentaxForums.com

The D FA* 50mm SDM AW is already on the roadmap for spring 2018.
HD Pentax D FA? 50mm F1.4 Coming Soon - Pentax Announcements | PentaxForums.com

I'd love to reconsider my budget, however my bank account tends to disgree vehemently about increasing the budget. So I make do with what I can afford.

Faster aperture/shallower DOF. Since my current 50 is MF any AF is better.

Differnce in image quality mainly, Bokeh secondary.

The new D FA 50 1.4 due out is expected to be way outside my price range. If I had that much money, I'd get the 15-30 first.
02-12-2018, 06:18 PM   #27
Pentaxian
angerdan's Avatar

Join Date: Feb 2015
Photos: Albums
Posts: 1,004
QuoteOriginally posted by Craigbob Quote
I'd love to reconsider my budget, however my bank account tends to disgree vehemently about increasing the budget.
How to Get Money to Buy Camera Gear - The-Digital-Picture.com
For LBAs
02-13-2018, 12:42 AM   #28
Pentaxian




Join Date: Oct 2009
Location: North
Photos: Gallery
Posts: 4,261
Just get the FA50/1.4.
Its cheap for a 50mm f1.4, its the fastest of the Pentax AF options, and its really a good all rounder 50mm in terms of size, AF, bokeh in most situations, sharpness when its needed.
At one point I had all the M and A 50mms (f1.4-f2).

The 6 aperture blades is the downside of the 50/1.7 for an otherwise good lens.
The OOF highlights show up as a "hex" from f2.8 onwards which can be distracting or even "inappropriate" in some situations.

The "softness" comments about the FA50/1.4 is not really taken in context imo.
This is an older lens that is not the all round sharp from wide open modern 50mm, in which the user will have to also pay the penalty of size and weight.
Its certainly sharp in the center even at f1.4, provided its within a few meters and focus is properly obtained.
Nowadays, I will often switch to LVAF to nail focus when shooting at f1.4 and f1.8 as its more accurate than PDAF imo.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
k-mount, lens, macro, pentax lens, slr lens, vs
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
fast 50s, other fast lenses, nice bokeh? cream Pentax SLR Lens Discussion 37 10-11-2013 11:55 AM
How fast of an SD card is fast enough? SammyLeopold Troubleshooting and Beginner Help 12 06-26-2012 02:24 PM
What's a FAST (used to be fast) film lens neverbnnba Pentax SLR Lens Discussion 11 07-03-2010 05:42 PM
What is "Fast" about the fast Fifties... jess Pentax SLR Lens Discussion 11 01-04-2009 05:18 PM
A Fast Fifty Is Really A Fast 75mm drewdlephone Pentax SLR Lens Discussion 182 12-08-2008 10:38 AM



All times are GMT -7. The time now is 02:04 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top