Revisiting SQUARE crop on K-1-series

Started Jul 28, 2018 | Discussions thread
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Barry Pearson
Barry Pearson Veteran Member • Posts: 9,625
Revisiting SQUARE crop on K-1-series
2

There have been many threads on this topic. I've listed some of them near the bottom of this post.

My reasons for revisiting this topic are mainly:

First: I didn't spot a description of how to use Lightroom to make a SQUARE DNG into an FF DNG. So I'll included a description in this thread. I accept that I may be duplicating what someone has already posted. The description will be a response here with the subject:
"Using Lightroom to reverse SQUARE crop"

I'll supplement this with extracts of the DNG metadata to show what is happening, as another response here:
"DNG Metadata for K-1-series Crop Modes and Recover Edges"

Second: I'm experimenting with using the (latest) Pentax 1.4x Rear Converter on all my lenses on my K-1ii, and SQUARE may have a role in avoiding poor image quality at the extremes of FF.

I've been experimenting using my lenses on FF, with and without a 1.4x converter, from 2013 up to now, and posting results here:

2013: Test images using my DA(*) lenses on a 35mm camera
https://www.dpreview.com/forums/post/51908965

2013: Pentax Full Frame tests
http://www.barrypearson.co.uk/articles/pentax/ff-index.htm

2016: Tests of de-baffled 60-250mm on K-1 at FF
https://www.dpreview.com/forums/post/58125198
https://www.dpreview.com/forums/post/58125263

2018: Using the Pentax 1.4 Rear Converter on fisheye lenses
https://www.dpreview.com/forums/post/61417847

This topic is still "work in progress". When I have anything worth saying, I'll post it in this forum.

...

A subset of other threads about SQUARE:

K1 equilateral rectangle format
https://www.dpreview.com/forums/post/60868321

Affordable K1 Lens Options
https://www.dpreview.com/forums/post/60705261

K1 1:1 Aspect Ratio
https://www.dpreview.com/forums/post/60515062

The Square Format
https://www.dpreview.com/forums/post/60065548

Another benefit of the 1:1 crop option-
https://www.dpreview.com/forums/post/58448904

1:1 crop implementation is pathetic
https://www.dpreview.com/forums/post/58434250

 Barry Pearson's gear list:Barry Pearson's gear list
Ricoh GR III Canon EOS R5 Canon EF-S 10-18mm F4.5–5.6 IS STM Venus Laowa 12mm F2.8 Zero-D Canon RF 15-35mm F2.8L IS USM +26 more
HD Pentax DA AF 1.4X AW Rear Converter Pentax K-1 Pentax K-1 II Pentax smc DA* 60-250mm F4.0 ED (IF) SDM
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