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Latest Review Posted 6x7 Rear Converter 1.4x
Be aware that the stock photo used is actually the 1.4x converter for the 800 EDIF lens. The normal 1.4x converter looks exactly like the new 2x converter and has Pentax 67 rear converter 1.4x - on the side of it.

Excellent coatings and performance. Shooting with this in place will not degrade the performance of the lens. I don't thing the 90 lens will work with this converter either.

It's a great way to gain another "lens" with actually doing so. The 200 lens at f/4 now becomes a 280 lens at f/5.6. Gets you close to a 300 lens, yet is still sharper (newer 67 version of the 200) than a 300 lens.

I've used this on my 400 EDIF lens for astrophotography making it a 560mm lens at f/5.6. Still fast enough for astro work, does not add or cause any aberrations, and stars are still sharp almost to the very edge of the film.

When adding this converter to an f/4 lens - the extra glass causes the reduction in light and the lens therefore becomes f/5.6. Just remember to leave the f stop on the lens at f/4. If you change it to f/5.6 thinking to match the converter setting - you will have just made the lens into f/8.

It's a handy item to have to extend existing lenses. But since getting the two Pentax zoom lenses, I rarely use the converter now except for astrophotography. This converter will not fit on the two zoom lenses.

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