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Forum: Pentax Medium Format 09-13-2018, 01:41 PM  
6X7 55mm Lenses
Posted By desertscape
Replies: 10
Views: 531
Hmm; okay, thanks Thomas.

Steve
Forum: Pentax Medium Format 09-06-2018, 04:34 PM  
Post your medium format photos!
Posted By desertscape
Replies: 12,531
Views: 2,044,036
Nice stormy landscape panoramic Tuco. You have B&W figured out.
Forum: Pentax Medium Format 09-05-2018, 04:29 PM  
Post your medium format photos!
Posted By desertscape
Replies: 12,531
Views: 2,044,036
This is a shot of Taveuni, Fiji taken in 1999 with a Pentax 6x7 and Velvia 50. I spent many months in the South Seas.
Forum: Pentax Medium Format 09-03-2018, 01:21 PM  
The real 645!
Posted By desertscape
Replies: 76
Views: 2,410
To be clear, the 6x7 frame (Pentax) is 55 X 70mm.
Forum: Pentax Medium Format 08-29-2018, 01:23 PM  
Pentax 6x7 MLU Polaroid/back door
Posted By desertscape
Replies: 26
Views: 687
You could easily add the 45mm and 75 f/4.5 to your 55mm and have a pretty good landscape setup. Or you could go with the 55-100 zoom since they have come down a lot in price.
Forum: Pentax Medium Format 08-27-2018, 04:32 PM  
Pentax 6x7 MLU Polaroid/back door
Posted By desertscape
Replies: 26
Views: 687
Actually, the 105 is a bit short for portraits if you look at what has been traditionally used in the 35mm world for portraits (90mm & 100mm). I find the 6x7 150mm, 165 and 200 to be better suited for it.
Forum: Pentax Medium Format 08-27-2018, 11:43 AM  
6X7 55mm Lenses
Posted By desertscape
Replies: 10
Views: 531
Okay, thanks guys; just curious about this old lens. Will probably stay with my 55-100 instead.
Forum: Pentax Medium Format 08-26-2018, 11:37 AM  
6X7 55mm Lenses
Posted By desertscape
Replies: 10
Views: 531
Has anyone ever used both the latest 55mm and the old 55 f/3.5? The old version has some good reviews and it's one of the lenses I have never owned. Are the two comparable in performance? As I recall, the landscape pro, David Muench used the 55 f/3.5.
Forum: Pentax Medium Format 08-10-2018, 04:50 PM  
645Z and legacy glass
Posted By desertscape
Replies: 7
Views: 530
It is interesting that Pentax abandoned the outer bay use on their newer telephotos, the 400 and 800 EDIF lenses. After using two of these outer bay lenses, I must say that this was a good idea. They are a pain to use, mostly due to the mounting on the body and the mounting of tubes or converters.

The P67 105mm f/2.4 may be a good choice for portraits with the Z.
Forum: Pentax Medium Format 08-10-2018, 02:03 PM  
645Z and legacy glass
Posted By desertscape
Replies: 7
Views: 530
All Pentax 67 versions used the same mount and those lenses can be used on the Z with adapter. There were 30 optically different lenses made for this system and there is performance differences between them, so investigation is required to make choices between them. Of course the 645 film lenses are an easier choice because no adapter is needed.
Forum: Pentax Medium Format 08-09-2018, 12:21 PM  
TTL Not Working
Posted By desertscape
Replies: 20
Views: 789
I shoot E-6 only as my customers back in the day would only accept slide film. I still have tons of it frozen. I have it developed by AgX in Michigan and scan it myself using a Plustek 120.
Forum: Pentax Medium Format 08-05-2018, 04:11 PM  
Pentax 645Z replacement?
Posted By desertscape
Replies: 88
Views: 4,882
If I owned a D or Z, I would consider looking at the proven winners of the 67 lens line. Because the 645 film lenses and the 67 lenses were designed by the same company, there is the sentiment that they are similar in design type. While that is true in many cases, there are some important exceptions. The 645 legacy glass did not have a Distagon-like lens like the 55mm (latest) on the 67. Nor did the 645 line have an Angenieux Retrofocus variant like the 75 Takumar/Pentax. Both of these would be worth trying with adapter on the Z/D. I believe the 67 had these lenses and not the 645 because the 67 was the company's flagship and got special attention back then.
Forum: Pentax Medium Format 08-01-2018, 12:17 PM  
Lost in Translation?
Posted By desertscape
Replies: 14
Views: 805
Just a bit more recent! The 45mm looks very close in cross section to the 21mm Super Angulon-R designed for the Leicaflex cameras by Schneider.
Forum: Film Processing, Scanning, and Darkroom 07-08-2018, 04:08 PM  
Film Processing
Posted By desertscape
Replies: 24
Views: 1,558
It may be in the UP but you can't argue with the results. It's not a big lab from what I know. If it's got to be done right, send it to Mike.
Forum: Photo Critique 07-04-2018, 08:45 PM  
Architecture At the University of Iowa
Posted By desertscape
Replies: 7
Views: 233
As an experiment, try shooting this with a Pentax 645 or 6x7 using Provia 100 F or Velvia 50 film, partially polarized. The green lawn would be deeper with less reflection. The water would have less reflection, as would the building and trees.
Forum: Monthly Photo Contests 07-03-2018, 03:59 PM  
French Polynesia
Posted By desertscape
Replies: 14
Views: 195
Island of Moorea.
Forum: Film Processing, Scanning, and Darkroom 07-03-2018, 02:44 PM  
Film Processing
Posted By desertscape
Replies: 24
Views: 1,558
The best E-6 lab in the US is AgX in Michigan. It is for pro shooters mostly.
Forum: Pentax Medium Format 07-01-2018, 01:52 PM  
Sticky: Block diagrams of every 645 A series lens
Posted By desertscape
Replies: 12
Views: 14,398
It also shows the trapezoid prism and Keplarian finder.
Forum: Pentax Medium Format 06-28-2018, 03:06 PM  
6x7 advice
Posted By desertscape
Replies: 27
Views: 1,399
The 90 Takumar LS was made up to 1988, at which time the 165LS took over in its place. The 165 superseded the 90. This is according to the many lens manuals I have.
Forum: Pentax Medium Format 06-24-2018, 09:11 PM  
Lens layout/diagram?
Posted By desertscape
Replies: 16
Views: 890
Yeah Gary, the one that I have pictured was based on a Biogon design with thick central elements and mostly negative elements up front and a more positive group at the rear used to clear the mirror box. It's not that different from the 45mm. The latest 55 uses thin elements and is clearly based on a Distagon design. Every iteration of the 55 was an improvement on the last; typical Japanese continuous improvement philosophy.

Steve
Forum: Pentax Medium Format 06-24-2018, 01:06 PM  
Lens layout/diagram?
Posted By desertscape
Replies: 16
Views: 890
P6x7 55mm, second optical version.
Forum: Pentax Medium Format 06-24-2018, 12:29 PM  
Pentax 645n | I want to shoot film
Posted By desertscape
Replies: 25
Views: 1,381
If you already own the 645Z, I would stick to the P645NII for lens interchangeability reasons. If you don't own the Z you might consider the 67 since you are thinking of fine art work.
Forum: Pentax Medium Format 06-23-2018, 04:29 PM  
Lens layout/diagram?
Posted By desertscape
Replies: 16
Views: 890
The 90 LS was called a Takumar, the regular 90mm was a Pentax. I have the cross section of the 55mm 6x7 ( second optical version) if that is the one you want. Let me know Medium4Matt.
Forum: Pentax Medium Format 06-18-2018, 11:54 AM  
Post your medium format photos!
Posted By desertscape
Replies: 12,531
Views: 2,044,036
Right lighting (side lit and no harsh shadows), right model.
Forum: Pentax Medium Format 06-18-2018, 11:34 AM  
Grand Lens Test 9: Pentax 645 A 120mm f/4 Macro
Posted By desertscape
Replies: 13
Views: 1,077
Spherical aberration by color has been a challenge for lens designers for years. Most photographic lenses tend to have as many colors as possible focus at the focal plane that emanate from the area 40% out from the center of the optic. They know that the diaphragm can be used to truncate the poorly corrected marginal rays, so the serious spherochromatism at the margin is somewhat ignored. Conventional glass telephotos were afflicted with massive fringing wide open due to spherochromatism but the newer, low dispersion long lenses do much better, mostly because the glass used just does not separate the colors very much in the first place.
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