Not necessarily. Some of us prefer to do no PP unless totally needed. When I had a film {"FF"} camera my primary lens was a 28-80mm lens - I used Kodachrome 25, and did no cropping PP. Now I have an APS-C camera, and my primary lens is a 18-55mm lens - it gives me roughly the same view I got previously, and I still do no cropping. If I ever get a FF camera, I will go back to a 28-80mm as my primary lens, and I will still plan to do no cropping PP. I see no reason to plan to throw pixels away.

1.5*18 = 27
1.5*55 = 82.5

The OP asked how to determine which lens to use to provide the same view without cropping. The simple answer is "multiply the APS-C number by 1.5 and pick the nearest convenient number". Every other answer is introducing "correctness" and/or complexity that the OP doesn't need.


added: so, if the OP were asking the same question, but going from a Medium Format camera, you would advise taking four pano FF pictures and combining them rather than coming up with appropriate focal lengths based on previous usage?????

Thank you.

I've never seen one using a path quite this way, and she was so nonchalant about it.

You should be able to do this with almost any picture-editting software you have for other purposes - just copy from source to destination. You can do that sort of thing with gimp, for example.

My wife and I stopped at a nature preserve on the edge of Windsor, Ontario, this past weekend. As we slogged down a muddy trail, this young lady came the other way up the trail. She stopped about fifty feet from me, clearly puzzled. The sign clearly said "Wildlife Trail" - not "People Trail" - and yet, there we were. Eventually she gave up and went "cross country" through the surrounding woods to get around us.

Corner-to-corner sharpness is a relatively new goal. "Old time" lens designers focused equally on various other aspects of how a lens renders the scene.

By default, Pentax "FF" cameras work essentially the same as Nikon, switching to "crop mode" when using "DA" lenses, but the user can over-ride this behavior.

My wife and I spent this past weekend in Canada, at Pt Pelee NP. One of the sections of the park was formerly a farm .... and over time they are allowing it to "return to nature". I took the first picture below using a new-to-me 28-105mm lens, and as I studied it {locals had conveniently provided a bench there to honor Jack Parson, who apparently had a real passion for the place}, I realized it wasn't what I had envisioned before I took the picture - the view was from too far .... I wanted to convey what it was like to be there, so I switched to my 18-135mm lens. This allowed me to take several steps towards to marsh, and to put some of the distractions {such as a corner of the boardwalk} out of view. This was the view I was seeking - essentially the same framing, but now the viewer was more part of the scene rather than seeming to view it from a distance.

Part of my reason for posting this is that I will sometime I will encourage someone to "step into" the scene before s/he presses the shutter. This is the kind of effect I am thinking of.
...

28mm view on APS-C K-30


18mm view on APS-C K-30

Not at all true. Using a DX lens on a D850 is almost exactly like using the same lens on a D500.

That depends on the width of DoF you work with and your skill at manual focusing. Most of the pictures I take today are no more difficult than the ones I took using my manual focusing Pentax Super Program I purchased in 1983. I still use that camera on occasion - in fact it shares lenses with the K-30 I purchased in 2015 - and I find manual focusing with the K-30's "focus confirmation" to be slightly easier than manual focusing with the Super Program's "split prism"

But all this discussion is off topic - I mentioned these options for your benefit. There is absolutely no evidence that current production Pentax cameras at any price level have these problems, and the KP, very reasonably priced at $900, has the upper-scale mechanism which has never had issues.

You have been told partial truth and your response can lead to confusion.

(1) Your K-50 is not a paperweight. What fails is the auto aperture control - the thing that differentiated KA-mount from K-mount. It could still be used with at least some lenses with manual aperture ring ... and there are lots of them out there. Yes, you lose the automation ... you have to set aperture, take an extra step to get right metering, and manually focus, but that is definitely not a "paperweight".

(2) There is a company out in California that fixes this issue for something like $100 + shipping.

(3) No failures have been reported with the K-70 so far - there is a possibility that Pentax changed their parts supplier - but if you're concerned about this issue you can get a KP, which has the same aperture control as the K-7, K-5, K-3 families, and this issue has never ever been reported with one of them. The K-70 is under $500 while the KP is roughly $900.

added: Any brand can have issues. I am a low volume shooter, so it took me seven years to accomplish this, but I had two Canon Rebels in a row die on me with a total shutter count of under 5000, and each had been demonstrating processor issues before it died.

Pentax cameras are not Waterproof, but almost all {including the K-70 and KP} are Weather Resistant, so I am quite willing to carry my K-30 around in rain or threat of rain ... I always had to bundle up my Rebels at the first hint of rain, but now my camera puts up with what I put up with {remembering that vigorous zoom activity could suck some of that water into the system.



I think the silver KP is really "cool" looking. When I retire my K-30, that is what I'm going to get.

This statement if factually true, but it is a confusing and misleading statement. No one cares what the physical image on the sensor looks like - what they care about is what the printed image or displayed image looks like, and the APS-C image is magnified more than the FF image is to reach the same printed or displayed size.

To answer the original question, a "FF" camera will act exactly as a "35mm" camera would. If you're told that this was a 200mm lens, which is "equivalent to a 300mm lens on a 35mm camera", then you would want a 300mm lens on a FF camera to get the same image. If you're told that this was a 50mm lens, which is "equivalent to a 75mm lens or a 35mm camera", then you would want a 75mm lens on a FF camera to get the same image.

But they will be fully functional, because Canon fully understands the EF-mount.

Honestly, in our modern world, there are all kinds of occasions when sending something {not just a picture} as an email attachment is necessary. You need to know how to do that .... and then sending pictures without Picasa will be simple also.

Yes "run and gun" is more of a sports term than anything else.

I have a lot more trouble with that than I used to - spend too much time explaining to cops that I'm not a terrorist. Even taking pictures of stations can be an issue, especially if it turns out that a Senator regularly commutes from there

(2005) Wilmington DE - home of Joe Biden