Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
05-28-2021, 07:51 AM - 1 Like   #16
New Member
beeperhorrie's Avatar

Join Date: Apr 2020
Location: Almere, the Netherlands
Posts: 8
Original Poster
QuoteOriginally posted by barondla Quote

Cool project! Can't wait to see some results. One thing to keep in mind. 110 lenses don't have adjustable apertures. The system is set for F 2.8. The further your adapted lens is from this, the greater the exposure error. Luckily negative film has lots of latitude.

Thanks for sharing,
barondla

I have a pair of 2.8 lenses but it is not necessary. The camera measures through the lens, so with a smaller aperture, the camera assumes darker conditions.


Last edited by beeperhorrie; 07-10-2021 at 01:05 PM.
07-18-2021, 02:37 PM - 1 Like   #17
New Member
beeperhorrie's Avatar

Join Date: Apr 2020
Location: Almere, the Netherlands
Posts: 8
Original Poster
The project actually failed. The diaphragm is located in the camera body just in front of the mirror and therefore at a very short distance from the film. With a telephoto lens that is too long (from about 400mm) vignetting will occur on the photo. If the diaphragm is not fully open, problems arise with shorter lenses. If the aperture is closed (f18 at 110 Super), there are already problems at 100mm.
The aperture screens the image.

See the schematic image below.


What do the photos look like? Well, that in itself is very good. The photos with the aperture open are usually very beautiful. They also use the best part of the lens, the center.
Pentax 135mm


Unfortunately, most photos suffer from vignetting.
Pentax 135mm


Tamron 200mm



Since the Pentax 110 Auto is a fully automatic camera, you cannot choose the aperture yourself. What I did find is the interpretation of the automatic exposure of both the regular Auto 110 and the Auto 110 Super. These values ​​are shown below in the diagram with the EV values. It is therefore important for the most common Pentax (the Auto 110) to ensure that the camera indicates in the viewfinder that the flash should be used (1/30 sec.). For the Auto 110 Super that is 1/60 sec.

These times immediately make it necessary to work from a tripod with the cable release. Sports promotions are therefore excluded. Because you have to stay below EV8 (or EV9 for the Super), you will have to temper the incoming light on sunny days with filters. Also don't forget to close the viewfinder because the exposure will be affected otherwise.

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!
adapter, adapter for k-mount, auto, k-mount, lenses, pentax, pentax auto
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Machinery VROOM, VROOM ! FA 55-110 mm f/5.6 ED @ 110 mm FL and f/11. RICHARD L. Post Your Photos! 3 08-28-2020 03:50 PM
First pictures with f:2.8/24 mm & homebrew Pentax auto 110 to M4/3 adapter Erich_H Pentax SLR Lens Discussion 2 02-17-2020 03:25 PM
For Sale - Sold: Pentax Q system: kit w/01, 02, 03, PK adapter, auto 110 24mm and 70mm lenses Nick Siebers Sold Items 3 10-24-2013 08:54 AM
Something nice for our Pentax Auto 110 users: Auto 110 lens database Adam Pentax Film SLR Discussion 3 09-24-2010 06:42 AM



All times are GMT -7. The time now is 11:48 PM. | 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