All Forum Comments
Comment by petrochemist posted on What other manufacturer bodies take K mount lenses at 31/08/2017 - 00:51
The best I've managed to date was a Practica MTL-5 camera & 3 lens kit for £10. The lenses included where a CZJ Tessar 50/2.8, CZJ MC 135/3.5 & CZJ Flektagon 35/2.4 all in good condition. e-bay sold prices suggest the last of these could be worth £200
The runner up is a Tamron model 52BB (SP90 F2.5 macro) for £1. [IIRC it even came with a PK adapter. Admittedly it is in cosmetically poor condition but the optics were reasonably clean & it takes good pictures.]
Comment by petrochemist posted on Used bargains at 30/08/2017 - 14:01
TFS
Comment by petrochemist posted on A selection of Dragonflies at 26/08/2017 - 12:59
Very Nice Mike.
Shame it's so close to me but I used all my leave on the BTCC weekends so unable to make it
I like the B-17 best too
Pete A
I might bump into you on Sunday at Rockingham, I'm taking along a couple of friends from the club.
Comment by petrochemist posted on A few from the Clacton Airshow: at 24/08/2017 - 09:47
Comment by petrochemist posted on Knockhill BTCC at 24/08/2017 - 09:44
If they where sold as lighting gels I'm not convinced you'd have any comeback, if their listing suggests they can be used for imaging then you have good grounds IMO.
Unfortunately they do scratch very easily, or I'm sure they'd be much more popular.
Comment by petrochemist posted on Irix ND Gels at 22/08/2017 - 11:21
Very tempting except the price is somewhat more than my lens fund has available...
Comment by petrochemist posted on Pentax SMC PK-A ED IF 1200mm f8 Lens at 20/08/2017 - 11:05
I've owned a circular 10 stop filter for a couple of years, having only used it once with average results.
So I decided to have another go last weekend, only for my Pentax remote die on me :-/
What I've viewed online, and try, was to compose the scene in AV mode, noting the shutter speed. Then attatch the filter, switch to manual exposure and bulb mode then shoot using a cable release for the appropriate shutter length.
Does this sound about right?
The Pentax remote is being replaced with a wired model.
Thanks
Adrian
This of course falls down if you get beyond 30s, but it's pretty easy to work out from the number remaining.
Rather than using a remote (which I can rarely find when I need it) the cameras 2s self timer is usually adequate.
Comment by petrochemist posted on 10 Stop filter tips at 17/08/2017 - 18:30
Hi Rob,
Yes I know, what I was saying is if the exposure is adjusted by 10 seconds there is no real difference to the exposure so if it's 30 seconds or 40 seconds, there's very little visual difference and even less if the initial exposure runs into a minute or more.
Using welding glass that is roughly 18 stops I've photographed the sun & my resultant exposures where small fractions of a second (1/500 springs to mind). Note unlike normal ND filters, welding glass blocks UV & IR as well. Photographing the sun through a normal 10 stop filter will likely result in 'eclipse blindness'... No doubt there will be thousands of cases of this on Monday.
Many less extreme subjects (eg. shallow DOF in bright light) may end up with exposures around 1s, and a 10s difference here will be significant.
Comment by petrochemist posted on 10 Stop filter tips at 17/08/2017 - 18:16
I did pick up a Raynox wide angle adapter (which clips on small lenses the same way their close up lenses do). It wouldn't focus on anything so I suspect the macro part is missing though there no clear place for it to fit - I only paid £3 & got it for the mounting more than the lens so I'm not really bothered.
Comment by petrochemist posted on K&F fish eye adapter at 15/08/2017 - 19:37


I'd second Stu's suggestion of a K5, but think you should be able to track one down for no more than £250.
It might be worth getting a quote for repairing your Kr before deciding what to do.