Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
08-21-2019, 12:31 PM   #1
Site Supporter
Site Supporter




Join Date: Oct 2015
Posts: 61
Manual lens on K1

I have had some nice shots with vintage glass on K3 and now K1. I have been inputting the focal length when turning on the camera after switching to manual lens aperture. I'm assuming so this is to enable correct shutter speed with the green button. Is there a way to input focal length manually? I was using for example a vintage 20mm lens and the nearest in the drop-down list on the K1 is 35mm which is quite a difference.
Thanks for any advice.
Don.

08-21-2019, 12:37 PM   #2
Site Supporter
Site Supporter
boriscleto's Avatar

Join Date: Dec 2009
Location: North Syracuse, NY
Photos: Gallery
Posts: 14,451
The focal length you input when you power on the camera is for the Shake Reduction. It does not affect metering with the green button.
08-21-2019, 12:37 PM   #3
Pentaxian
ismaelg's Avatar

Join Date: Apr 2009
Location: Puerto Rico
Photos: Gallery
Posts: 1,069
Hello,

The input of the focal length is used to properly control shake reduction. I don't think it has any effect in shutter speed.

Thanks,
Ismael
08-21-2019, 12:46 PM   #4
Site Supporter
Site Supporter
david94903's Avatar

Join Date: Nov 2010
Location: San Rafael, CA
Photos: Gallery
Posts: 623
With a manual lens mounted, when you turn on the camera, the cameras will ask for you to input the lenses focal length manually by using the scroll wheel to select the "correct" one. Now it's possible (I haven't run into it) that you might be using a lens with an unusual focal length that's not listed, and it that's the case, you'd just have to choose one that's close. I use a M20mm lens on my K-1 regularly, so there is a choice for that lens focal length. Not sure why you're not seeing that option. Maybe not scrolling far enough? Also, make sure the camera custom menu is set to allow for the A setting so you can adjust your aperture accordingly on the lens.

08-21-2019, 12:47 PM - 1 Like   #5
Site Supporter
Site Supporter




Join Date: Oct 2015
Posts: 61
Original Poster
Oh I see. I was misunderstanding the process then. Many thanks for enlightening me.
Don.
08-21-2019, 01:04 PM - 2 Likes   #6
Site Supporter
Site Supporter
david94903's Avatar

Join Date: Nov 2010
Location: San Rafael, CA
Photos: Gallery
Posts: 623
It's interesting.... I love modern glass. It's just amazing. Sharp, fast, excellent IQ. Easy. But I find I have the most fun shooting with older glass. Taking the time to compose, focus, review, think... it's downright therapeutic. I have a M20mm that I've owned since dirt was new, that has found a new life on my K-1 (it was pretty useless on my crop sensor bodies). And I have a Leitex converted Nikkor 135mm f3.5, and Bronica 150mm f3.5 (Kudos to Fenwoodian for making this lens available on the Marketplace) that are just a joy to use. I probably use those three lenses 80% of the time these days.
08-21-2019, 01:06 PM   #7
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 48,735
I'd be surprised if 20mm wasn't in the list. That said, there's no way to input a custom value. Just select the closest one and you should be fine.

Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)



PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

08-21-2019, 01:46 PM - 1 Like   #8
Pentaxian
Cipher's Avatar

Join Date: Jan 2016
Location: Minnesota
Posts: 423
One interesting feature of the Pentax Q cameras is that you must input the exact focal length when using manual lenses, down to a tenth of a millimeter. I wonder if a firmware upgrade in the future could enable that on the Pentax DSLRs, the menus are similar.

08-21-2019, 02:11 PM - 1 Like   #9
Site Supporter
Site Supporter




Join Date: Oct 2015
Posts: 61
Original Poster
Another mistake of mine. I was just scrolling up and down the values displayed on left of screen which goes from 35 to 1000mm and not clicking right to select more values.
Thanks for correcting me.
Don.
08-21-2019, 02:57 PM   #10
Pentaxian
Tjompen1968's Avatar

Join Date: May 2012
Location: Norrköping, Sweden
Photos: Gallery | Albums
Posts: 1,385
You can absolutely input 20mm. Just use the rear scroll wheel. The list contains the latest focal lengths you have used.
08-21-2019, 10:39 PM   #11
Tas
Site Supporter
Site Supporter




Join Date: Aug 2013
Location: Brisbane, QLD
Photos: Gallery | Albums
Posts: 1,872
QuoteOriginally posted by Adam Quote
I'd be surprised if 20mm wasn't in the list. That said, there's no way to input a custom value. Just select the closest one and you should be fine.
20mm is one of the default options, I use it with my 21mm lens.

Tas
08-21-2019, 10:56 PM - 2 Likes   #12
GUB
Loyal Site Supporter
Loyal Site Supporter
GUB's Avatar

Join Date: Aug 2012
Location: Wanganui
Photos: Gallery | Albums
Posts: 3,410
QuoteOriginally posted by Cipher Quote
One interesting feature of the Pentax Q cameras is that you must input the exact focal length when using manual lenses, down to a tenth of a millimeter. I wonder if a firmware upgrade in the future could enable that on the Pentax DSLRs, the menus are similar.
Yes wouldn't that be great and even better with say a decimal point so you can identify individual lenses.
08-22-2019, 08:36 AM   #13
Site Supporter
Site Supporter




Join Date: Dec 2015
Location: Goldsboro North Carolina
Photos: Gallery | Albums
Posts: 509
As I understand it, some lenses aren't really the focal length printed on them when lab tested. So decimal point accuracy in the camera may be unnecessary, unless you find a lab test that says your 20mm lens is actually 21.2mm. I understand wanting to squeeze every last bit of benefit from the SR system, but I'm sure it has its limitations.
08-22-2019, 12:54 PM - 1 Like   #14
GUB
Loyal Site Supporter
Loyal Site Supporter
GUB's Avatar

Join Date: Aug 2012
Location: Wanganui
Photos: Gallery | Albums
Posts: 3,410
QuoteOriginally posted by Apet-Sure Quote
As I understand it, some lenses aren't really the focal length printed on them when lab tested. So decimal point accuracy in the camera may be unnecessary, unless you find a lab test that says your 20mm lens is actually 21.2mm. I understand wanting to squeeze every last bit of benefit from the SR system, but I'm sure it has its limitations.
You misunderstand - Many of us have several say 50mm lenses of different make/model. My A 50 1.4 could be 50.1, My M50 1.17 could be 50.2 etc.
08-22-2019, 04:59 PM - 1 Like   #15
Pentaxian
Cipher's Avatar

Join Date: Jan 2016
Location: Minnesota
Posts: 423
QuoteOriginally posted by Apet-Sure Quote
So decimal point accuracy in the camera may be unnecessary
Actually, on the Q it can make a difference with the fisheyes, some of which are under 3mm.
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!
dslr, full frame, full-frame, k-1, k1, length, lens, pentax k-1
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
K1 or K1 mark ii Kevin.mcde Pentax DSLR Discussion 23 05-06-2019 04:46 PM
Pentax K1 or Pentax K1 Mark ii giselag Pentax K-1 15 01-04-2019 01:36 PM
For Sale - Sold: Pentax K1 Kit - Pentax K1, Sigma ART 35mm F1.4, and Pentax 77mm F1.8 Jerry_Lundegaad Sold Items 14 11-13-2018 03:10 PM
K1 to K1 II surgery on camera but I had the lobotomy. rechmbrs Pentax K-1 7 08-31-2018 11:20 AM
K1 Vs K1 Mk2 Mallee Boy Pentax K-1 50 05-17-2018 09:00 AM



All times are GMT -7. The time now is 07:40 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