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Forum: Pentax Medium Format 07-17-2020, 08:23 AM  
Post your medium format photos!
Posted By Thomas
Replies: 15,570
Views: 2,579,855
Neowise over Lake Erie about 1.5 hr. after sunset. 645Z, 80-160mm

Forum: Pentax Medium Format 04-13-2020, 05:02 AM  
The P645 200s: thoughts and experiences?
Posted By Thomas
Replies: 43
Views: 2,893
Photos were taken under different lighting conditions. Pink tint was from tungsten light. I did not adjust WB; I was only comparing sharpness. Color rendition of the Pentax lenses is consistently good.
Forum: Pentax Medium Format 03-16-2020, 12:19 PM  
The P645 200s: thoughts and experiences?
Posted By Thomas
Replies: 43
Views: 2,893
Rob:
I'm glad you're happy with the lens. As you know, I wrote a very favorable review some time ago after comparing the zoom to primes at 150, 200 and 300. I wrote the review in part in response to a terrible, and not explainable, review of the lens left by a very disgruntled poster.
I own all the lenses mentioned in this thread and the concern over the coronavirus has resulted in a lot of free time. So I tested: the 150-300mm zoom at 200mm; the Pentax A 200mm; the Pentax FA 200mm; the Pentax 67 200mm and the Fuji G 100-200 at 200mm. All at f/11; lighting conditions varied and I did not adjust WB. All were processed in ACR with default sharpening. I did not adjust for any CA; however, the Fuji corrections for the G lens are baked into the file. The crop is of an isopropanol bottle that happened to be on a desk (not virus related but a certain irony). The text on the label gives a good illustration of sharpness and contrast. My overall conclusion: there is little to choose between these lenses. The A is the weakest and FA and Fuji the best, but the differences are so slight as to be almost meaningless for real applications. An interesting effect that I don't understand: the Fuji and FA files show some sort of chromatic aliasing or aberration in the text that is absent in the files from the other lenses. All the text should be black, but the two mentioned lenses render some of the text red or blue. Each image of the bottle is about 600 pixels (native) in width and so represents about 2 inches at 300ppi on a print of 28 inches if all 8300 pixels in the file were used. Fuji GFX 50r was used for all images, using EFSC. I put them in the album linked below.

Tom

Thomas's Album: 645 150-300mm vs. 200mm primes - PentaxForums.com
Forum: Pentax Medium Format 07-11-2019, 08:24 AM  
Post your medium format photos!
Posted By Thomas
Replies: 15,570
Views: 2,579,855
Thank you Stephen. It's not always deary (in fact, I getting a bit tired of the sun lately). You should come visit more often. FYI, The London Times just dubbed Buffalo :America's Coolest Summer City", and they are not referring to the temperature. :lol:

Buffalo, New York: America?s coolest summer city | Travel | The Sunday Times
Forum: Pentax Medium Format 07-10-2019, 07:25 AM  
Post your medium format photos!
Posted By Thomas
Replies: 15,570
Views: 2,579,855
I have been using Pentax cameras since I acquired a Spotmatic in 1973 and at some point have used nearly all the MF bodies. I currently live along the shore of Lake Ere and my photos often involve the lake. I belong to a local arts organization that has an annual "Studio Tour". Typically I sell prints during this event, this year I had a book available of photographs taken within a 2-mile radius of Dunkirk, NY, a lakeside community. The photos span over a decade and were taken either with a Pentax 67, 67II, 645, 645N, 645D or 645Z. So I thought this might be of interest to the forum members. If you follow the link and then click "read now", you can see every image.

Tom

Cooler by the Lake | MagCloud
Forum: Pentax K-1 06-25-2019, 08:13 AM  
K-1 trouble: random double exposures
Posted By Thomas
Replies: 34
Views: 5,751
This just happened with my K-1. First I tried turning off SR and then a firmware update. Then I did a search. I use the 4-way to switch from single exposure to timer quite frequently; somehow I manged to set it for multi exposure :)
Forum: Pentax Medium Format 04-15-2019, 09:28 AM  
HD Pentax DFA645 Macro 1:2.8 90mm ED AW SR - problem shake reduction broken
Posted By Thomas
Replies: 9
Views: 1,492
Similar problem here: Help
Forum: Troubleshooting and Beginner Help 04-15-2019, 09:22 AM  
Help… Mysterious problem and tale of woe with my HD 90mm
Posted By Thomas
Replies: 8
Views: 1,249
I'm having the same issue with my 28-45mm; I wonder how widespread this is?
Forum: Monthly Photo Contests 03-22-2019, 07:03 AM  
Beech Tree on the Shore
Posted By Thomas
Replies: 9
Views: 248
A marvelous old beech, that has withstood years of ferocious winter storms, on the shore of a frozen Lake Erie. About 30 min. after sunset

Forum: Pentax Medium Format 03-21-2019, 12:52 PM  
Filters for 6x7 55-100 MM Lens
Posted By Thomas
Replies: 6
Views: 861
Standard 95mm filters fit fine, I have also used a 100mm filter with a 95-100mm step up ring. I haven't used any of the square filters with a holder on this lens, I have simply held a ND filter in front of the lens for the duration of the exposure (not very often) and had no problems.
Forum: Pentax Medium Format 09-13-2018, 04:14 AM  
6X7 55mm Lenses
Posted By Thomas
Replies: 10
Views: 1,416
I had the first gen 55mm (in fact I still have a 100mm bayonet filter for it); I still have the 3rd gen 55mm and the 55-100mm zoom, both of which are sharper than the old 55.
Forum: Monthly Photo Contests 04-05-2018, 07:12 AM  
Tall Ship onthe Horizon
Posted By Thomas
Replies: 25
Views: 827
Tall ship on Lake Erie. It was participating in events to commemorate the 200th anniversary of the U.S. victory over the British in the Battle of Lake Erie. Distortion caused by the long distance involved gives a ghostly impression.

_IGP9295 by tsjanik47, on Flickr
Forum: Pentax Medium Format 03-19-2018, 06:08 AM  
Filling a gap in a lens lineup for an Alaska trip
Posted By Thomas
Replies: 36
Views: 2,880
Rick:
I highly recommend you consider the FA 150-300mm. It's light, fairly compact and allows perfect framing between 150 and 300mm. The lens hasn't gotten great reviews here (one of which is silly bad), but my copy is excellent. I have the 645 150mm A and FA, the 200mm FA and the 67 30mm M*; whatever the zoom loses to the primes is made up by its framing ability. You need not take my word alone, in a recent interview with Charles Cramer on LuLa, he indicates he loves the lens. Enjoy your trip.

Tom
Forum: Pentax Medium Format 03-15-2018, 07:41 AM  
the 25mm lens
Posted By Thomas
Replies: 31
Views: 2,896
I love the 645Z but the lack of a really wide lens is a serious shortcoming; the 28-45mm is not wide enough for some of my uses and its cost, weight and size are real liabilities.
Additionally, I wonder how is it that Fuji can supply a 23mm at half the price of the discontinued Pentax 25mm?
I don't know the answer to Ed's question, but I noted that the D FA 25mm was listed at 1070g (Ricoh) and the DA 25mm is listed at 1040g (B&H). If the only difference in the lenses is a bigger hood and baffling for the DA version,it should be heavier, not lighter, than the D FA.
Forum: Pentax Medium Format 01-21-2018, 10:54 AM  
67 vs 645 digital
Posted By Thomas
Replies: 15
Views: 3,302
I did some comparisons when I bought a 645D in 2010. My conclusion then was the the D and 67
were about equal in detail. Link below is a comparison of the Pentax 645N, Pentax 67 and 645D. Provia film scanned on a Nikon 9000; 645 35mm A lens on the 645N and 645D; 45mm on the 67.
I like the color of the D slightly better than the Z and resolution is not that different, but if high ISO, DR and live view are important, then the Z is the better choice

tom's: 645N, 645D, 67II

Below is a link to a series which compares color from the 645Z, 645D and Sigma DP2:

IMGP0788 cropcopy copy | 645Z | tsjanik47 | Flickr
Forum: Pentax Medium Format 12-19-2017, 01:41 PM  
Pentax 2X Magnifier
Posted By Thomas
Replies: 4
Views: 1,624
I used one with my 645D, it works fine for critical focus and easily flips up to see the whole scene. I have a 645Z so I use live view now. If you are interested in mine, send a PM.

Tom
Forum: Pentax Medium Format 09-14-2017, 07:47 PM  
Post your medium format photos!
Posted By Thomas
Replies: 15,570
Views: 2,579,855
You have one of the really good 645 lenses.

Have fun and let's see some photos.
Forum: Pentax Medium Format 07-06-2017, 07:16 PM  
Post your medium format photos!
Posted By Thomas
Replies: 15,570
Views: 2,579,855
Eastern screech owl in the hollow of a silver maple. I'm really excited to have this appear in the July issue of Outdoor Photographer:
645Z, 600mm A*.
Forum: Pentax Medium Format 05-03-2017, 05:57 AM  
Post your medium format photos!
Posted By Thomas
Replies: 15,570
Views: 2,579,855
Although I live close to Burlington, no; it's the Wabash river near Huntington, IN
Forum: Pentax Medium Format 05-03-2017, 04:57 AM  
Post your medium format photos!
Posted By Thomas
Replies: 15,570
Views: 2,579,855
My thoughts exactly about the 400 and 150-300mm zoom, both sharp, light and easy to handhold. The 600 is a great lens, but so susceptible to vibration that its use requires considerable care; it's also so heavy that I find myself using it only when the 400 simply is not long enough.



Here are a few using the 600mm:

_IMG4661 copy by tsjanik47, on Flickr

_IMG3741 copy by tsjanik47, on Flickr

_IGP1148 by tsjanik47, on Flickr
Forum: Sold Items 04-04-2017, 01:25 PM  
For Sale - Sold: Pentax K-3 Premium Silver Edition, under 3000 actuations
Posted By Thomas
Replies: 2
Views: 1,047
SOLD PentaxForums.com Marketplace Listing

Item for Sale
SOLD Pentax K-3 Premium Silver Edition, under 3000 actuations

Asking Price
650.00 USD

Item Location
Dunkirk, NY (United States)

Item Description
Pentax K-3 Premium Silver Edition which includes an unused silver D-BG5 battery grip and all other items as shipped by Pentax. I haven't used the camera very much and the camera has approximately 2900 actuations. I purchased this from Lloyd Chambers who used it for his review on diglloyd.com. Basically a near new camera, the only indications of use are some minor marks on the body.

Are you the original owner of the item being sold?
No

Are you selling or trading this item?
Selling

Item Condition (Key)
Used
Mint

Shipping Destinations
Continental U.S. Only

Shipping Charge
20.00

Shipping Services
USPS, UPS, FEDEX

Accepted Payment Types
PayPal Check/Money Order

Return Policy & Additional Details
No returns unless you convince me it's the right thing to do. Items work perfectly, near new with only a few marks on the body. I will ship insured for the purchase price.

Please send me a private message if interested in the item!
Forum: Pentax Medium Format 03-09-2017, 10:52 AM  
645z viewfinder display problem
Posted By Thomas
Replies: 7
Views: 1,286
Thanks.. LOL, I expected some complicated macro setup!
Forum: Pentax Medium Format 03-08-2017, 06:44 PM  
645z viewfinder display problem
Posted By Thomas
Replies: 7
Views: 1,286
Gunner:

I'm glad to hear all is well and the rapid turnaround. How die you manage to get the image through the viewfinder that you posted?

Tom
Forum: Pentax Medium Format 02-08-2017, 01:35 PM  
How Can I tell The difference between the 67 55mm 4.0 NEWER one vs Older one
Posted By Thomas
Replies: 23
Views: 2,844
There are three versions of the 55mm, all of which can be seen here:

Pentax 67 Wide-Angle Primes - Lens Reviews and Specifications - SLR and Interchangeable Lenses - Pentax Lens Reviews & Lens Database

The newest is regarded as one of the best 67 lenses (rating in the database 10)
Forum: Pentax Medium Format 02-07-2017, 10:17 AM  
Question about 600mm A-star lens with 645z
Posted By Thomas
Replies: 14
Views: 2,092
Below is about close focus limit. Flowers about 3 in/8cm in diameter; not sure of the distance. Wide open BTW

---------- Post added 02-07-2017 at 03:46 PM ----------



Almost no CA anywhere; the lens is highly corrected with 12 elements.
Works well with the 1.4x; sold my 2x.
I don't use this handheld very often and even then rest the barrel on something. I use the 400mm handheld frequently, but not the 600. Keep in mind this is a MF lens, so the hand needed to turn the focus ring also must support the lens barrel. My experience is that is very difficult to achieve the quality this lens is capable of using it handheld.
Also, shutter shake is a real issue at slower shutter speeds.

---------- Post added 02-07-2017 at 03:55 PM ----------

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