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11-10-2019, 08:25 AM   #31
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QuoteOriginally posted by photoptimist Quote
Those slip-in filters might also help your ∞-focus issues. Assuming they are made of glass, they will reduce the ∞-focus distance by 1/3 the thickness of the filter.
So if a lens focuses to infinity exactly at its focus stop, the clip in filter will cause it to reach infinity slightly before the stop? Does this also work for a glass filter screwed into the front of the lens?

Asking because a friend's 300 mm would focus to infinity. Put a certain glass uv filter on and the split image focusing aid would no longer align. The lens couldn't reach infinity. This seems backwards of the clip in filter behavior.
Thanks,
barondla

11-10-2019, 08:39 AM - 1 Like   #32
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QuoteOriginally posted by barondla Quote
So if a lens focuses to infinity exactly at its focus stop, the clip in filter will cause it to reach infinity slightly before the stop? Does this also work for a glass filter screwed into the front of the lens?

Asking because a friend's 300 mm would focus to infinity. Put a certain glass uv filter on and the split image focusing aid would no longer align. The lens couldn't reach infinity. This seems backwards of the clip in filter behavior.
Thanks,
barondla
If the filter is mounted between the lens and the subject, the distance-shift is between the lens the subject. If you focus on a nearby object and then put a 2-mm-thick filter, the plane of focus at the subject will shift by 0.67mm toward the lens. That wouldn't affect ∞-focus, thought because ∞ minus 0.67 mm is still ∞.
11-10-2019, 02:13 PM - 2 Likes   #33
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This thing pulls out quite a Disneyland with no filters. Here is a vertical panorama with Samyang 24mm T/S.



The Samyang itself is a bit of a flare gun
11-10-2019, 11:05 PM   #34
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QuoteOriginally posted by MJKoski Quote
This thing pulls out quite a Disneyland with no filters. Here is a vertical panorama with Samyang 24mm T/S.



The Samyang itself is a bit of a flare gun
ss

Super image! Very dynamic subject and composition. Can't wait to see more results.
Thanks for sharing,
barondla

11-29-2019, 01:29 AM - 1 Like   #35
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Just ordered: The IRchrome Infrared Photography Filter - Our Digital Version of Kodak Aerochrome - Kolari Vision

77mm size. Red trees incoming :O
12-05-2019, 09:28 AM - 1 Like   #36
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I wrote earlier about infinity focusing problems. They are real with my K-1 MK2 and they were there already before the modification with Zeiss 50MP. Long story short, after receiving TWO 15-30mm D-FA zooms which were decentered badly, I decided to get my old Irix 15mm lens back. Today I received the lens from the dealer with which I swapped the lenses.

Here are two 100% crops from image center taken from apartment window before and after a little lens modification:

1. Unmodified Irix lens, focused as far as it goes towards infinity @ f/4:



2. I opened the lens and took out a spacer. Now it reaches infinity @ f/2.4 and goes even BEYOND!



Suddenly the Irix becomes sharper @ f/2.4 than average copy of 15-30mm zoom wide open @ f/2.8 with unmodified camera. Looks like this full-spectrum system requires major efforts to get things going. Here the spacer I removed was about 1/10mm thick and now I am a happy camper. I don't have the clip-on filter yet. Ordering it this weekend.
12-19-2019, 10:14 AM   #37
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QuoteOriginally posted by MJKoski Quote
Think you will really enjoy this filter, I picked up a 52 and 67mm. Feels very close to shooting the old aerochrome film.
12-23-2019, 03:37 PM - 3 Likes   #38
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Merry Christmas and such events to all!

I went and took some foggy Christmas photos with the IR-Chrome filter. I was quite surprised how the scenery turned out. Cannot wait to shoot this during the summertime.











Forever Autumn -filter. It also seems to filter out most of artificial light during the night when shooting some cityscapes. Quite handy actually.

12-26-2019, 04:32 PM   #39
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Wonderful photos. I'm still impressed by how similar the effect is to the old aerochrome. It is a great filter year round.
12-27-2019, 04:22 AM   #40
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Great photos. Keep them coming.
Thanks for sharing. Great Thread!
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