nass

Joined: 5th August 2009

All Forum Comments

Topics Created Topics Contributed Forum Comments Photo Comments

All Forum Comments

nass
bwlchmawr wrote:
Some say that a lens such as the one you cite will be better on a camera with an APS-C sensor since you only make use of the "best" bit, i.e. the middle. The bonus with using a telephoto zoom is that you get more for your money, focal length-wise. For example, a 300mm lens "becomes" 450mm.
Hello couls,

Just to clarify on this, I found it quite confusing when I started so hopefully I can explain. APS-C, today's Pentax DSLRs, have a sensor area that is smaller that the sensor area of a full frame camera. In other words it records a smaller view that a full-frame would. This smaller view means a smaller angle of view. To throw in some imaginary figures:

a 300 lens on fullframe might record a 10 degree field of view
The same 300 lens on APSC might only record an 8 degree field of view
a 400 lens on fullframe might also record an 8 degree field of view

So what the marketers do is try and persuade us that the 300 on APSC is actually a 400, based on the field of view number. Personally I've always thought it a bit dubious, as a 300 is a 300 whatever camera you put on, but dubiousness has never stopped a marketer pushing a good line

Hope that vaguely helps,

-Johan

Comment by nass posted on Full frame or not ??? at 07/08/2015 - 09:25

nass
It's clearly a bug, isn't it. Doesn't look like that particular product specialist was as familiar with Pentax cameras as we are, which let's be honest doesn't surprise me. Let's hope for a firmware update. Fwiw, some of these functionalities with old lenses do get lost on new digital Pentaxes, I don't think Pentax Japan is really fully aware to the extent that people like us use these DSLRs with very old lenses. For example they changed something with flash and old manual lenses on the K5 without telling anyone and actually I had to be the one to explain to them what they'd changed.

But then this isn't just DSLRs this happens. For example I've had to explain things about web hosting to Fasthosts (they changed all their web hosting based on something I pointed out to them). That's not blowing my trumpet, it's just saying that when you're prepared to really delve deep into the detail of something then you often become more knowledgable than low level tier 3 support people, who are more often than not forced to learn and absorb vast quantity than deep quality. I bet that technician is expected to be a product specialist on dozens of cameras.... as if...

Comment by nass posted on K-3 II firmware bug? anyone else got it? at 27/07/2015 - 17:19

nass
Late addition but K3-ii for me. I do a bit of focus stacking and whilst the super resolution feature doesn't look to be available with flash, nevertheless I think I can use it for natural and continuous light stacking, and I'll be interested to experiment with it. Ironically the lack of flash doesn't matter to me at all, because whilst the inbuilt flashes on my K7 and K5 are useful, the recharge times are too slow for me to use them effectively for macro. My external units like Metz 58, Pentax 540 and Pentax 160 recharge must faster and give me better light.

But, I do also tinker with other types of photography and already have the Pentax O-GPS unit, so having this built in is quite convenient for me. So out of the two, it's the -ii hands down for me.

Comment by nass posted on K-3 or K-3 II? at 27/07/2015 - 17:01

nass
I can't speak for that one particular product of theirs, but I do have experience of the Cognisys. I don't give many companies 5/5 for customer service but they thoroughly deserve it (based on buying Stackshot through them).

Comment by nass posted on Cognisys StopShot at 13/04/2015 - 17:39

nass
nass wrote:
How about just buying a decent clear filter and permanently gluing it in. That should give you the full thread the other side and bonus lens protection.
Or even buying the cheapest clear filter you can find with threads both sides, hammering out the glass and gluing just that in

Comment by nass posted on Broken filter thread at 18/03/2015 - 11:00

nass
How about just buying a decent clear filter and permanently gluing it in. That should give you the full thread the other side and bonus lens protection.

Comment by nass posted on Broken filter thread at 18/03/2015 - 07:40

nass
Melness, older manual macro is worth more than a punt, especially if it's only a passing fancy. What are you hoping to shoot, that'll give us a clue as what best to suggest.

Comment by nass posted on older macro lens at 10/12/2014 - 06:32

nass
Looks fine to me, at least it's responsive. Although resizing on desktop does slightly disguise that, I had to test it on ipad. "Change" is always a little bit uncomfortable until users have had a chance to use it. Although in this case it makes the site very "samey" regarding ePhotozine, so it's not as distinctive anymore. Which is probably the corporate aim but not sure if it'll work for the users.

Comment by nass posted on New Pentax User Redesign Screenshots at 06/11/2014 - 12:43

nass
I've used it since k-7 and yes works fine, within limited boundaries. Better than nothing! I can't remember why I stopped using it though, I think it was having to reset it after every photo through the menu system? Can't remember offhand.

Comment by nass posted on Using sensor shift at 14/10/2014 - 15:25

nass
No, they're all doubled up polarisers. But with the cheaper ones you get more of a pronounced "x" over the photo (ie darker areas on the photo over the x bit). I made some myself and the difference between using decent and not so decent polarisers is pronounced.

Comment by nass posted on variable ND filters at 09/10/2014 - 10:40

Proudly supporting Pentax User

Samsung Logo Asahi Pentax Logo