Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
03-18-2010, 03:28 PM   #1
Senior Member
Halco's Avatar

Join Date: Aug 2009
Posts: 123
645 Issue

Recently picked up the original 645 and the A80-160mm zoom. Shot a roll of Provia to test the system, and the returned slides were so underexposed that they were nearly black; Is this a problem with the system or the user? Its was shot on shutter priority auto mode.

03-18-2010, 04:03 PM   #2
Senior Member
Halco's Avatar

Join Date: Aug 2009
Posts: 123
Original Poster
Just to add, I have checked the iso setting, it was correct.
03-18-2010, 04:59 PM   #3
Veteran Member




Join Date: Nov 2008
Location: Washington DC, USA
Photos: Albums
Posts: 548
Do the aperture blades snap open and closed when you activate them manually? You might notice some darker areas on the blades - leaking lubricant/oil that might be gumming up the works and causing the blades to not open/close properly. Although, if it is underexposed, then that is probably not the issue (when you focus and before you depress the shutter, the blades should be fully open) and I would suspect overexposure might be more likely, but who knows.

The P645 original has an additional battery - large, flat button like - apart from the 6 AAs in the grip. Perhaps this is expired or putting out too little voltage and causing problems?

Also, I can't remember, but I thought the P645 has exposure compensation. Could it be engaged and causing your underexposure? Might also be worth you while to put in some new AA batteries.
03-18-2010, 05:03 PM   #4
Senior Member
Halco's Avatar

Join Date: Aug 2009
Posts: 123
Original Poster
The lens is perfect, hardly used, no problems. Exposure compensation was not engaged, but I'll try out switching the battery. In my opinion it almost looks like the iso was off, even though it was set correctly.

03-18-2010, 08:18 PM   #5
Senior Member
Halco's Avatar

Join Date: Aug 2009
Posts: 123
Original Poster
Now this is perplexing. I compared metering readings to my P5, at at the same aperture, shutter speed and iso, the 645 is off by EXACTLY one stop. i.e. My 100 iso film must be shot at 50. Any ideas what my be causing this? I've got a feeling I'll be replacing it.
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!
camera, medium format, shot, system
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: Pentax 645 Rear Converter-A 645 1.4X (US/UK/CAN/AUS) yurihuta Sold Items 1 11-07-2010 06:58 PM
K5/K7 with K-Adapter/645 and PENTAX-D FA 645 55mm F2.8 = WEATHERPROOF??? Wololo Pentax News and Rumors 9 09-08-2010 05:14 AM



All times are GMT -7. The time now is 05:40 AM. | See also: NikonForums.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