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Forum: Pentax Medium Format 10-05-2017, 05:21 PM  
does your 300mm ed 67 lens have a hard stop infinity focus?
Posted By Ed Hurst
Replies: 6
Views: 443
I hear you mate! (LOL) Of course any temperature fluctuation would also be a problem, even if it doesn't extend into actually being warm :-)
Forum: Pentax Medium Format 10-05-2017, 05:19 PM  
Post your medium format photos!
Posted By Ed Hurst
Replies: 11,129
Views: 1,804,234
Pentax 645Z with 28-45 f4.5 DA lens.

Hornby Lighthouse (near to the entrance to Sydney Harbour from the ocean).

[IMG]StarTrailsFromFiles_MAL5089-6645_Step15sRGBSMALL by Ed Hurst, on Flickr[/IMG]
Forum: Pentax Medium Format 10-05-2017, 03:10 PM  
does your 300mm ed 67 lens have a hard stop infinity focus?
Posted By Ed Hurst
Replies: 6
Views: 443
My 6x7 300mm EDIF, 6x7 400mm EDIF, 645 600mm lens, etc. all do this to an appreciable degree. Any long lens is designed like this to allow for expansion in the heat. If it had a 'hard stop' at infinity at cooler temperatures, it would not reach infinity when it gets warmer. So they give it space to focus beyond infinity to give some expansion space. Why only longer lenses? Or at least why is this only present to a noticeable extent in longer lenses? Because only they have parts large enough for it to be evident or required. So it's perfectly normal and correct. The implication is that you need to positively focus on the distance you require, not just throw the lens on infinity and expect it to be correct :-)

If it didn't do this, you'd find you cannot focus on infinity at all in the heat, which would be a much worse problem.
Forum: Pentax Medium Format 09-28-2017, 12:16 AM  
Post your medium format photos!
Posted By Ed Hurst
Replies: 11,129
Views: 1,804,234
Sydney Harbour Bridge from below.

Pentax 645Z with 25mm f4 DA lens.

[IMG]StarTrails by Ed Hurst, on Flickr[/IMG]
Forum: Pentax Medium Format 09-10-2017, 05:19 PM  
Post your medium format photos!
Posted By Ed Hurst
Replies: 11,129
Views: 1,804,234
Thank you so much for the thoughtful reply - very interesting and useful. Apologies for the slow reply...
Forum: Pentax Medium Format 09-07-2017, 08:50 PM  
Post your medium format photos!
Posted By Ed Hurst
Replies: 11,129
Views: 1,804,234
Taken during a trip to Singapore.

Pentax 645Z with 28-45mm f4.5 DA lens (at 29mm).

[IMG]_MAL7526Step9sRGBSMALL by Ed Hurst, on Flickr[/IMG]
Forum: Pentax Medium Format 09-03-2017, 07:09 PM  
Post your medium format photos!
Posted By Ed Hurst
Replies: 11,129
Views: 1,804,234
Star trails over cloud inversion - Blue Mountains, NSW, Australia.

Pentax 645Z with 25mm f4 DA lens.

StarTrailsFromFiles_MAL7039-7271Step9sRGBSMALL by Ed Hurst, on Flickr
Forum: Pentax Medium Format 09-03-2017, 03:28 PM  
Post your medium format photos!
Posted By Ed Hurst
Replies: 11,129
Views: 1,804,234
More from Bronte ocean pool in Eastern Sydney.

Pentax 645Z with 25mm f4 DA lens:

[IMG]_MAL2748Step4PersCropSpotSMALL by Ed Hurst, on Flickr[/IMG]

[IMG]_MAL2750Step4sRGBSMALL by Ed Hurst, on Flickr[/IMG]

[IMG]_MAL2762Step5SpotSMALL by Ed Hurst, on Flickr[/IMG]


And this one with the 150mm 2.8 FA lens:

[IMG]_MAL2766Step4sRGBSMALL by Ed Hurst, on Flickr[/IMG]
Forum: Pentax Medium Format 08-29-2017, 10:58 PM  
Post your medium format photos!
Posted By Ed Hurst
Replies: 11,129
Views: 1,804,234
Thanks mate. Yes, removing those would be a PAINFUL exercise. But I would do it gladly if I thought it would deliver the best shot. Or I could back in the depth of the winter when the birds are not there ;-)
Forum: Pentax Medium Format 08-29-2017, 03:26 PM  
Post your medium format photos!
Posted By Ed Hurst
Replies: 11,129
Views: 1,804,234
What do you guys think? I would normally work hard to edit out birds in a star trail image, but in this case, I feel it adds something. Rather as though the lighthouse is pouring out a fluttering ticker tape mass of birds with its light beams.

All feedback gratefully received.

[IMG]StarTrailsFromFiles_MAL3812-4211(WithBatOrBirdTrails)_Step9sRGBSMALL by Ed Hurst, on Flickr[/IMG]

Pentax 645Z with 28-45mm f4.5 DA lens @ 38mm.

---------- Post added 08-30-17 at 08:30 AM ----------

Pentax 645Z with 25mm f4 DA lens.

Bronte pool in Sydney's Eastern Suburbs. Usual mad swimming person before dawn.

[IMG]_MAL2753_Step7sRGBSMALL by Ed Hurst, on Flickr[/IMG]
Forum: Pentax Medium Format 08-23-2017, 01:55 AM  
Post your medium format photos!
Posted By Ed Hurst
Replies: 11,129
Views: 1,804,234
2. is a cracker, mate!
Forum: Pentax Medium Format 07-13-2017, 03:40 PM  
Post your medium format photos!
Posted By Ed Hurst
Replies: 11,129
Views: 1,804,234
Thanks, mate. I was going for that feeling... Glad you like 'em... Appreciate it.
Forum: Pentax Medium Format 07-11-2017, 11:42 PM  
645 D FA 35mm
Posted By Ed Hurst
Replies: 5
Views: 1,024
I presume you mean f3.5 rather than f2.8?
Forum: Pentax Medium Format 07-11-2017, 05:37 PM  
Post your medium format photos!
Posted By Ed Hurst
Replies: 11,129
Views: 1,804,234
In a sojourn away from my more usual style, here are some abstractions. Feedback very welcome!

[IMG]MGP5360And5362BlendStep4V2FlatSMALL by Ed Hurst, on Flickr[/IMG]

[IMG]IMGP5360Step5sRGBSMALL by Ed Hurst, on Flickr[/IMG]

[IMG]IMGP5363Step6sRGBSMALL by Ed Hurst, on Flickr[/IMG]

[IMG]IMGP5362Step4sRGBSMALL by Ed Hurst, on Flickr[/IMG]

All taken with Pentax 645Z and 28-45mm f4.5 DA lens.
Forum: Pentax Medium Format 07-10-2017, 03:13 PM  
Proper portrait lens purchase
Posted By Ed Hurst
Replies: 46
Views: 2,986
Hello there,

Delighted to hear how much you are enjoying the system - it's wonderful!

Firstly, a point of clarification - there are two main versions of the 90mm f2.8. One of them has the leaf shutter, the other does not. Are you sure you're looking at an L/S version? From my experience, the L/S version is optically not as good as the non-L/S. (There are also sub-variants of the 90mm from different eras with different coatings, but this is a less important distinction)

Given the lenses you have already, I would go for the 105mm. This is partly because it represents a more even spacing in your lens range (you already have a 75mm and a 150mm, so the 90 would be rather close to the 75; the 105 would cover the gap more evenly). The extra speed might help you to focus in dark situations (which weddings often have). But it is certainly a trade-off; if the 105mm is too long, the 90mm might just help and, although you can use the 75mm, yours is the f4.5 version, so you'd be trading off coverage with speed. So there's no perfect answer here.

In your position, I'd get the 105mm. It is a lovely lens. I still use mine on my 645Z with an adaptor.
Forum: Pentax Medium Format 07-07-2017, 04:00 PM  
Post your medium format photos!
Posted By Ed Hurst
Replies: 11,129
Views: 1,804,234
Thanks mate. Nothing out of the ordinary - shooting at 3am mostly!
Forum: Pentax Medium Format 07-07-2017, 03:13 PM  
Post your medium format photos!
Posted By Ed Hurst
Replies: 11,129
Views: 1,804,234
Thanks, Mike.

It was a very still night, so there was little movement. With branches showing obvious blurring, I used layers from single images to overlay (without straying into areas where trails show). Would not have worked had there been much movement... Nonetheless, close inspection at high res reveals there still is some.
Forum: Pentax Medium Format 07-07-2017, 01:34 AM  
Post your medium format photos!
Posted By Ed Hurst
Replies: 11,129
Views: 1,804,234
Or perhaps you prefer something a little more rural...

Pentax 645Z with 25mm f4 DA lens.

[IMG]StarTrailsFromFilesIMGP2542-2759PlusDarkFrameFromFile2768Step5sRGBSMALL (1) by Ed Hurst, on Flickr[/IMG]
Forum: Pentax Medium Format 07-06-2017, 07:36 PM  
Post your medium format photos!
Posted By Ed Hurst
Replies: 11,129
Views: 1,804,234
Another one in a series of shots depicting star trails in iconic urban locations.

Pentax 645Z with 150mm f2.8 FA lens.

[IMG]StarTrailsFromFilesIMGP2881-4294Step6sRGBSMALL by Ed Hurst, on Flickr[/IMG]
Forum: Pentax Medium Format 07-05-2017, 09:48 PM  
Super wide angle lens for the 645Z!
Posted By Ed Hurst
Replies: 14
Views: 1,219
Why would anyone pay that much for a fisheye period? ;-)
Forum: Pentax Medium Format 07-05-2017, 02:39 PM  
Post your medium format photos!
Posted By Ed Hurst
Replies: 11,129
Views: 1,804,234
[IMG]StarTrailsFromFiles_MAL0628-2350Step5sRGBSMALL by Ed Hurst, on Flickr[/IMG]

Pentax 645Z plus 120mm f4 A lens.
Forum: Pentax Medium Format 07-05-2017, 02:35 PM  
Super wide angle lens for the 645Z!
Posted By Ed Hurst
Replies: 14
Views: 1,219
True, though once you de-fish a 24mm, you will lose some of the angle of view. It could be that the 25mm gives you more than a defished 24mm. 28mm I am not so sure about. But assuming you don't want the fisheye effect, the difference will be less than one might expect.
Forum: Pentax Medium Format 06-17-2017, 09:36 PM  
645 Tilt Shift
Posted By Ed Hurst
Replies: 101
Views: 22,272
Would you mind sending me a PM with the price you want for the 25 DFA please?
Forum: Pentax Medium Format 06-12-2017, 08:23 PM  
25mm vs 28-45mm comparison on 645Z
Posted By Ed Hurst
Replies: 29
Views: 2,409
It's splendid!

---------- Post added 06-13-17 at 01:25 PM ----------



Could not agree more. The system, if it's to be the astro king, needs a fast 20mm or 21mm... It may be impractical, expensive, etc. and it may be something already done well by FF systems. But I want it very much!
Forum: Pentax Medium Format 06-12-2017, 05:39 PM  
25mm vs 28-45mm comparison on 645Z
Posted By Ed Hurst
Replies: 29
Views: 2,409
Lovely shots, Mike - the first one, especially. One frame, or two with blending (to tame the bright red light)?
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