Changing lenses Pentax 645

n333ms · 10-25-2020, 10:04 PM

I couldn't seem to find information on this subject, but can I change lenses mid roll without compromising an exposure on a Pentax 645?

Unregistered User 8 · 10-25-2020, 11:44 PM - **1 Like**

Yes, you are safe to change lenses mid-roll, just be careful not release the shutter during the process.

**Alex645** · 10-26-2020, 02:11 PM

Originally posted by n333ms

I couldn't seem to find information on this subject, but can I change lenses mid roll without compromising an exposure on a Pentax 645?

Originally posted by pjv

Yes, you are safe to change lenses mid-roll, just be careful not release the shutter during the process.

Out of curiosity, what camera can you not change lenses mid-roll without exposing the film? Double negative. Let me try this again: What camera will expose the film if changing the lens mid-roll?

**ProfessorBuzz** · 10-26-2020, 03:55 PM

Originally posted by Alex645

What camera will expose the film if changing the lens mid-roll?

Ummm... maybe the Linhoff Technorama III.

---------- Post added 10-26-20 at 03:56 PM ----------

I usually power-off my 645N and Z before changing lenses.

**barondla** · 10-26-2020, 04:31 PM

Originally posted by Alex645

Out of curiosity, what camera can you not change lenses mid-roll without exposing the film? Double negative. Let me try this again: What camera will expose the film if changing the lens mid-roll?

Had a fujica BL690 (Texas Leica) that had interchangeable lenses with built in leaf shutters. Fuji had to make a dark slide roll up curtain to shield the film from light. This would also apply to view cameras. Insert dark slide before changing lenses or else. Leaf shutter Hassy are probably similar.

Thanks,
barondla

**ProfessorBuzz** · 10-30-2020, 06:00 AM - **1 Like**

Originally posted by barondla

Leaf shutter Hassy are probably similar.

Leaf Shutter Hasselblads like the 500series have an internal shutter in the body, and there is also a dark slide for the film back. So you can change lenses without issue.

10-25-2020, 10:04 PM	#1
n333ms New Member Join Date: Oct 2020 Posts: 3	Changing lenses Pentax 645 I couldn't seem to find information on this subject, but can I change lenses mid roll without compromising an exposure on a Pentax 645?

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10-25-2020, 11:44 PM - 1 Like	#2
Unregistered User 8 Closed Account Join Date: Mar 2015 Photos: Gallery Posts: 8,694	Yes, you are safe to change lenses mid-roll, just be careful not release the shutter during the process.

10-26-2020, 02:11 PM	#3
Alex645 Site Supporter Join Date: May 2015 Location: Kaneohe, HI Photos: Albums Posts: 3,526	Originally posted by n333ms I couldn't seem to find information on this subject, but can I change lenses mid roll without compromising an exposure on a Pentax 645? Originally posted by pjv Yes, you are safe to change lenses mid-roll, just be careful not release the shutter during the process. Out of curiosity, what camera can you not change lenses mid-roll without exposing the film? Double negative. Let me try this again: What camera will expose the film if changing the lens mid-roll?

10-26-2020, 03:55 PM	#4
ProfessorBuzz Loyal Site Supporter Join Date: Feb 2018 Posts: 1,903	Originally posted by Alex645 What camera will expose the film if changing the lens mid-roll? Ummm... maybe the Linhoff Technorama III. ---------- Post added 10-26-20 at 03:56 PM ---------- I usually power-off my 645N and Z before changing lenses.

10-26-2020, 04:31 PM	#5
barondla Site Supporter Join Date: Sep 2006 Location: midwest, United States Photos: Gallery \| Albums Posts: 5,714	Originally posted by Alex645 Out of curiosity, what camera can you not change lenses mid-roll without exposing the film? Double negative. Let me try this again: What camera will expose the film if changing the lens mid-roll? Had a fujica BL690 (Texas Leica) that had interchangeable lenses with built in leaf shutters. Fuji had to make a dark slide roll up curtain to shield the film from light. This would also apply to view cameras. Insert dark slide before changing lenses or else. Leaf shutter Hassy are probably similar. Thanks, barondla

10-30-2020, 06:00 AM - 1 Like	#6
ProfessorBuzz Loyal Site Supporter Join Date: Feb 2018 Posts: 1,903	Originally posted by barondla Leaf shutter Hassy are probably similar. Leaf Shutter Hasselblads like the 500series have an internal shutter in the body, and there is also a dark slide for the film back. So you can change lenses without issue.