Mike discovers a tiny Cold War spy camera that can be worn on the wrist. The Tessina 35 was the smallest 35mm camera ever made and a fine example has come in from the cold at London's Portobello Road market. Read how to spend £500.

The Pinner Fair started in 1336 and 680 years later Mike took the Olympus PEN-F and M.Zuiko 7-14mm to meet the descendants. But, as he found out, the fair is more donuts and waltzers than turnips and chickens.

Reader Treve Kneebone has had his new Leica Q for a couple of weeks and, despite being generally happy with the camera, has noticed a banding problem which has been highlighted by a some others, including Ming Thein. I have to say I didn’t notice anything amiss when I reviewed the camera and, in general, I find the image quality of the Q outstanding.

After a month or so of using Apple Pay with my Apple Watch I am astounded by the general ignorance of retailers. I would say that in probably 80 percent of cases when I ask if they accept Apple Pay the answer is a firm no. But experience tells me that any swipe terminal  can also accommodate the Apple Watch (and, I have no doubt, the iPhone). So far I have never been disappointed when presenting the Watch to the card reader. Retailers are usually amazed and want to know how it works. Every time I tell them that the next customer who asks about Apple Pay should be answered with a firm yes.

What do the current Leica 50mm Summicron, 50mm Noctilux and 75/90mm Apo-Summicrons have in common? They all lack a focus tab, something that I find near essential, especially in a smaller-diameter lens such as the 50 Cron.

Everyone loves a bargain. Earlier this year I tested one of Leica Mayfair’s D-Lux (Typ 109) contacts and thoroughly enjoyed the process. I took it to the Bièvres Camera Fair, near Paris, and it showed its mettle as a compact, thoroughly competent travel company. Since then I have been lusting but refusing the get out the credit card. I rather fancied a used example although, it has to be said, such are as rare as rocking horse manure. The D-Lux is extremely popular.