All Forum Comments
Comment by andrewk posted on Pentax SMC M 50mm f1.7 at 12/10/2011 - 12:42
you really can't tell much about the sharpness of a lens from an image that isn't a 100% crop
Andrew
Comment by andrewk posted on Bad review for DA* 16-50mm at 10/10/2011 - 12:17
Andrew
Comment by andrewk posted on Pentax M 75-150 f4 First Impressions at 09/10/2011 - 17:41
I have one of these! Haven't used it on digital though....
This is a *snap* from a recent holiday, taken with a K200D. An 18 x 12 print of this looks outstandingly sharp.

and this is a 100% crop from it.

Andrew
Comment by andrewk posted on Pentax M 75-150 f4 First Impressions at 09/10/2011 - 11:36
Here's the action on the above pic. It took longer to open Photoshop than it did to remove the CA, which is just a 1 click job and done

Although I don't use the Rikenon in anger (at the moment), I have no intention of selling it. It's way too good to give away - and also quite rare.
Cheers
Andrew
Comment by andrewk posted on Purple fringing - the cause? at 04/10/2011 - 16:32
There's a very simple experiment, of course, which would confirm it, if anyone has a suitable lens, and still uses a film camera as well as digital.
I have a XR Rikenon 300mm f4.5 APO lens which is really quite sharp - but on my K200D generates lots of purple/blue fringing at most apertures. It does go away a bit at f11 and onwards - but it's more than enough to put me off using it with a DSLR. The fringing is a bit more blue than purple ........
I posted this 100% crop in a thread about the lens, some while back. The fringing is pretty obvious on the bike.

As it happens, I also have a Ricoh KR10 Super which might well be the camera the lens was originally made for. I might even have some rolls of Fuji Reala in the fridge (but they've been there for maybe 3 years).
Andrew
Comment by andrewk posted on Purple fringing - the cause? at 02/10/2011 - 19:47
Comment by andrewk posted on Too HDR or not? at 29/09/2011 - 11:17
1. Beach at Clachtoll

2. Another Clachtoll beach photo

3. Split Rock at Clachtoll

So ..... where are your favourite holiday places?
Andrew
Comment by andrewk posted on Favourite holiday places at 27/09/2011 - 12:08
It doesn't help with Pentax gear but for other makes the serial number can be informative.
Andrew
Comment by andrewk posted on Serial Numbers and eBay at 16/09/2011 - 23:40
Nice photos Simon
Andrew
Comment by andrewk posted on My first train shot at 12/09/2011 - 12:53


Well, the auction listing did say that the lens was like new - and Pentax lenses get lots of plaudits in this locale - and I do have and use two Pentax lenses that I use and like a lot, so I put what I thought was quite a modest bid on the SMC 50mm f1.7. To my extreme suprise, I won the lens for coppers over £18. It arrived two days ago - and goodness, it does look just like new!! It also came with a very new looking case too.
It didn't take long to take a handful of comparitive shots - at f2 and at f2.8 where I expected any differences to be the most pronounced. I do need to repeat the tests, more carefully, when it stops raining - but I *think* the Rikenon lenses might just have been retired.
Mmmm .......
Andrew