{"id":35813,"date":"2026-01-03T22:36:11","date_gmt":"2026-01-03T22:36:11","guid":{"rendered":"https:\/\/garfnet.org.uk\/cms\/?p=35813"},"modified":"2026-01-20T18:26:40","modified_gmt":"2026-01-20T18:26:40","slug":"from-portsdown-hill-in-infrared","status":"publish","type":"post","link":"https:\/\/garfnet.org.uk\/cms\/2026\/01\/03\/from-portsdown-hill-in-infrared\/","title":{"rendered":"From Portsdown Hill in Infrared"},"content":{"rendered":"

It was a cold but sunny day today. So I decided to take my “full spectrum” converted camera up to Portsdown Hill for some infrared snaps. I thought it might also be interesting to try it on my 120 year old Bausch & Lomb + Beck 101.6mm lens<\/a>. Whilst this is not a sharp lens, it has the advantage that it was made at a time when colour film was in the realms of science fiction. Which means it has no coating on its glass.<\/strong><\/p>\n

\"Infrared<\/a>
Infrared test shoot test with 120 year old Bausch & Lomb + Beck lens, from the north side of Portsdown Hill.<\/figcaption><\/figure>\n

To be honest, this did not have the dramatic effect I had hoped for. Infrared shots tend to be a bit fuzzy anyway. But all the images were soft – too soft in my opinion. It was impossible to achieve a sharp focus using infrared with this lens. I’m guessing this is because the infrared element focusses differently from the visible part of the spectrum?<\/p>\n

In any event, on reflection, Portsdown Hill in infrared might have been better on a modern sharper lens. I did manage a couple of snaps of a very large full moon, that I was moderately pleased with. In fact I used one as the article’s ‘featured image’.<\/p>\n

Hand-made filter adaptor<\/h2>\n

I also took a few snaps of the kit I used with a standard \u00b54\/3 camera. I did so because I am rather pleased with my home-made filter adaptor. This basically consists of a 12mm length of 32mm inside diameter uPVC waste pipe. I cut it from an old offcut with a giant tube cutter – for a nice clean even cut. I reamed out the inside a little with a piece of Emery cloth, so it slid over the Beck lens housing, with a nice snug interference fit.<\/p>\n

\"Bausch<\/a>
Bausch and Lomb + Beck lens-close-up, mounted on Vorsatz macro bellows. In front of the lens is my home made adapter fitted with 37mm -> 58mm step-up ring.<\/figcaption><\/figure>\n

I then slid a chunky 40.3mm -> 37mm step-down ring over the end of the plastic tube. This is invisibly held on the tube with a wrap of very thin double-sided sticky tape. It has about 3mm of 37mm male thread protruding from the end of the tube. Which is just enough to screw on a 37mm -> 58mm step up ring. So that now I can mount any of my collection of 58mm filters on the front. In fact, insofar as filters are concerned, this 120 year-old lens now behaves pretty much like all my modern lenses do.<\/p>\n

Gallery<\/h2>\nngg_shortcode_0_placeholder\n","protected":false},"excerpt":{"rendered":"

It was a cold but sunny day today. So I decided to take my “full spectrum” converted camera up to Portsdown Hill for some infrared snaps. I thought it might also be interesting to try it on my 120 year old Bausch & Lomb + Beck 101.6mm lens. Whilst this is not a sharp lens,…<\/p>\n","protected":false},"author":1,"featured_media":36023,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"_kad_post_transparent":"default","_kad_post_title":"default","_kad_post_layout":"default","_kad_post_sidebar_id":"","_kad_post_content_style":"default","_kad_post_vertical_padding":"default","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[1623,1630,19,1642,6,680,18,1619],"tags":[],"class_list":["post-35813","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-digital-photography","category-photographic-equipment","category-general","category-ir","category-journal","category-photography","category-technology","category-travelogue"],"yoast_head":"\nFrom Portsdown Hill in Infrared - GarfNet<\/title>\n<meta name=\"description\" content=\"It was a cold but sunny day today. 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