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Forum: Pentax Medium Format 01-15-2021, 01:31 AM  
Flange to Focal Plane for 645z
Posted By Bob L
Replies: 28
Views: 2,163
150mm closer than the spec is huge. The minimum focus distance (close focus) is referenced to the sensor/film plane.....is your measurement from the front of the lens, normally termed the working distance, by any chance?
Forum: Pentax Medium Format 12-22-2020, 08:53 PM  
What are the two 645 fitting lenses you can't live without?
Posted By Bob L
Replies: 40
Views: 2,782
That works for me too
Forum: Pentax Medium Format 11-13-2020, 01:06 AM  
Any other must have Russian medium format lenses?
Posted By Bob L
Replies: 4
Views: 1,825
Not strictly "Russian" but the later version (multi-coated) of the Carl Zeiss Jena 180mm f/2.8 Sonnar in Pentacon Six mount makes a very decent portrait lens and the Carl Zeiss Jena 120mm f/2.8 Biometar does a decent job too.
Forum: Pentax Medium Format 10-24-2020, 12:09 AM  
First shoot with Brand New 645Z: weird download?
Posted By Bob L
Replies: 14
Views: 1,354
I agree but the OP stated "The images downloaded completely out of sequence time-wise" so it should cure his problem
Forum: Pentax Medium Format 10-21-2020, 05:39 AM  
First shoot with Brand New 645Z: weird download?
Posted By Bob L
Replies: 14
Views: 1,354
Lightroom's Library mode gives you various options for ordering the files.....selecting 'capture time' should set you right.
(The tab is below the main screen panel when in library mode)
Forum: Pentax Medium Format 10-19-2020, 02:42 AM  
Pentax 645z Aperture closing fully
Posted By Bob L
Replies: 9
Views: 933
A theory (and only a theory).......
The aperture is stopped down by the motor against the tension of the return spring. Allowing it to open fully again after the shot is simply a matter of removing the force applied by the motor. By fully stopping down after the shot, the spring is tensioned to its maximum and this may ensure that the aperture snaps back to fully open. Smaller format lenses may not require the same return forces.
Forum: Pentax Medium Format 09-13-2020, 02:16 AM  
Pentax 645z doesn't turn off
Posted By Bob L
Replies: 7
Views: 1,095
It might be worth trying another memory card as I believe that the shutdown process includes a write to the card
Forum: Pentax Medium Format 08-24-2020, 07:28 AM  
645 Extension Tubes
Posted By Bob L
Replies: 32
Views: 8,169
I've got a couple of Canon T3 adapters....the Pentax twin cable release works fine with them (as does an old no-name cable release I have), Likewise I have the RA-E3 which converts from the E-3 plug (used on Canon pre-digital era SLR's) to the N3 plug (used on some higher end Canon DSLR's)

Are you certain that the parts are as stated?

Bob
Forum: Pentax Medium Format 07-18-2020, 10:02 AM  
645 A 120 or 67 100 (w LSC) for macro on 645D (or Z)
Posted By Bob L
Replies: 91
Views: 5,787
Murray O'neill's E-Book has some detailed information about the double release and Canon T3 adapter.......you can download it here:

https://www.pentaxforums.com/content/uploads/files/1/p1884/The_Pentax_Bellows.pdf

Bob
Forum: Pentax Medium Format 02-22-2020, 03:39 AM  
Pentacon 6 adapter recommendations
Posted By Bob L
Replies: 3
Views: 892
I had a similarly misaligned adapter that was causing the problem your describe but my Hartblei P6-645 is fine.
Forum: Pentax Medium Format 11-17-2019, 03:32 PM  
Pentax 67 vs 645d vs 645z with 67 Lenses
Posted By Bob L
Replies: 13
Views: 2,078
My MO with the Z is to use Liveview and peaking with all static subjects...even with 645-FA lenses.
Forum: Pentax Medium Format 11-17-2019, 04:57 AM  
Pentax 67 vs 645d vs 645z with 67 Lenses
Posted By Bob L
Replies: 13
Views: 2,078
I've never had a 67 body but I do have (and use) seven 67 lenses on my 645Z.....manual focus aside, they're pretty seamless in operation.
Forum: Pentax Medium Format 08-28-2019, 11:52 PM  
Peli or similar hard case for 645D/Z?
Posted By Bob L
Replies: 10
Views: 1,300
They're Peli's own velcro and nylon.
Forum: Pentax Medium Format 08-28-2019, 02:04 PM  
645Z Bulb and remote issue.
Posted By Bob L
Replies: 4
Views: 742
There is....C1-7 (page R39 in the user guide)
Forum: Pentax Medium Format 08-27-2019, 12:50 PM  
Peli or similar hard case for 645D/Z?
Posted By Bob L
Replies: 10
Views: 1,300
I can get a 300/4 or 400/5.6 in there at the expense of any two of the three zooms.
Forum: Pentax Medium Format 08-26-2019, 01:48 PM  
Peli or similar hard case for 645D/Z?
Posted By Bob L
Replies: 10
Views: 1,300
I can get my 645Z, 28-45, 45-85 and 80-160 (with space for batteries) in a Peli 1450 kitted out with padded dividers (not foam)....well within any carry-on size limits.
Forum: Pentax Medium Format 06-18-2019, 05:34 AM  
FA 4/300 with M8 tripod mount - bizarre
Posted By Bob L
Replies: 12
Views: 2,035
Fine with me Rainer......send me a message with your address and we'll get them on the move.

Bob
Forum: Pentax Medium Format 05-07-2019, 04:36 AM  
New 645z not turning off
Posted By Bob L
Replies: 18
Views: 2,370
I believe that part of the shutdown procedure involves a write cycle to any installed memory cards.....may be worth trying a different one or removing it/them.

Bob
Forum: Pentax Medium Format 04-29-2019, 02:04 AM  
FA 4/300 with M8 tripod mount - bizarre
Posted By Bob L
Replies: 12
Views: 2,035
Your profile shows you to be in France, Rainer. If that's the case then I'm happy to swap the foot off the tripod mount for one that still has the helicoil insert although the underside of the foot is scratched somewhat.....a trade off of functionality versus condition.

Bob
Forum: Pentax Medium Format 01-29-2019, 03:16 AM  
Pentax FA 645 lenses with hard stop at infinity?
Posted By Bob L
Replies: 8
Views: 1,144
I've just checked a few of mine and they do go slightly beyond the infinity mark....which seems to be the norm for AF lenses. Based on my greater knowledge of Canon's AF lenses then this allows for thermal expansion and continuous AF which requires movement marginally beyond the target distance.

Bob
Forum: Pentax Medium Format 11-16-2018, 01:53 AM  
Grand Lens Test 13: REJECTED 645 DA 28-45mm ED AW SR—Lens damaged and returned.
Posted By Bob L
Replies: 18
Views: 2,772
I bought this lens from Mark and would agree 100%....it's better than my ability and up there with the best of my Canon and Zeiss lenses.
Forum: Pentax Medium Format 11-02-2018, 05:45 AM  
Recommend Zeiss or Contax 645 Lens for 645D
Posted By Bob L
Replies: 14
Views: 3,202
It does indeed and I only raised the 67 55/4 as the op seemed to be looking outisde the 645 stable.
Forum: Pentax Medium Format 11-02-2018, 02:24 AM  
Recommend Zeiss or Contax 645 Lens for 645D
Posted By Bob L
Replies: 14
Views: 3,202
As far as the CZJ offerings go you should stick with the later MC (multi-coated) versions. The two that stand out from the crowd are the 180/2.8 Sonnar and the 120/2.8 Sonnar with the former being quite a heavy lump but worth trying if weight isn't going to concern you.
The 50/4 Flektogon is useable (but not special) and the 65/2.8 Flektogon was dropped before the MC's came out so that eliminates it from the potential choices. I really think that the Pentax 67 55/4 (final version) is probably the best option out there if you're looking at 60mm+/- away from 645 lenses.

For the 80mm, the CZJ 80/2.8 Biometar is acceptable, compact and cheap (it was the Pentacon Six kit lens) but isn't going to get remotely close to the D-FA 645 90mm lens.

Bob
Forum: Pentax Medium Format 10-23-2018, 01:05 AM  
645Z not working with LR tether Plug In
Posted By Bob L
Replies: 8
Views: 2,377
Plug the camera in and use "File Manager" (Windows....not sure of the MAC equivalent) to see if the SD card is visible.

Bob
Forum: Pentax Medium Format 10-03-2018, 09:10 AM  
AF not working around infinity with FA* 300mm f4 and 645Z
Posted By Bob L
Replies: 11
Views: 1,154
If "subjects in close or medium distance are focused correctly" then AF fine tune is not a likely candidate is it?
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