"Crop factor on D90 one more time!" Wed 21-Nov-12 04:54 PM by limeyzen
I know this has been addressed before (did the search, read the posts etc.) but I guess my peculiar learning challenge is getting in the way I find myself confused by the introduction (to me) of terms like FOV, AOV, FX vs DX et.al. and after a while I have a problem keeping track of all the intended helpful posts and then the subsequent dissenting opinions and around we go! It is my responsibility to get up to speed on those so not needed here but given the need to take Txgiving shots of groups let me pose my questions that hopefully result in "idiot's guide to crop factor etc 101" for me I really feel stupid for not being able to get this and hope my repeat on this topic does not cause too much frustration.
I have a D90 (steep learning curve!) and a 35-70mm F2.8 D Nikkor that I bought 15 years ago with my N90s. I have no intention of going FX in the future. My questions are:
- Is what I see through the viewfinder (sensor?) what I am going to get in the image? - If not what is the difference and how do I compensate for it? - If I want to add a zoom lens at the wide angle end (to partner with the 35-70) what do I have to take into account and what would be a good one for landscapes? And should it be a DX compatible lens (I guess that may change focal length suggestions?) if cost is not an issue?
#1. "RE: Crop factor on D90 one more time!" In response to Reply # 0
Yes, what you see through the viewfinder will be what is in the image.
That's the simple answer - at the risk of introducing unnecessary detail, the viewfinder on the D90 shows about 95% of the final image because of the way it's designed. That's nothing to do with the lens or DX / FX, though - the D700 which is an FX camera does the same sort of thing.
I only mention the 95% because if it's important that you capture exactly what you see (and because someone would correct me if I left it out) then using Live View on the rear monitor would be better as that shows precisely 100%.
For a wide lens to complement the 35-70mm, you'd be looking for something with an upper focal length around 35mm - and that applies whether you'd be using the lens on a D90 or an FX camera. Maybe your best option would be the AF-S VR 16-35mm f/4G Nikkor.
However... if you really never intend to go to the FX format (and many people don't) it may be an idea to look at a single lens that could replace the 35-70mm and cover the wide end. In that case, I'd recommend looking at the AF-S DX VR 16-85mm f/3.5-4.5G Nikkor, which would go as wide as the 16-35mm, AND a bit longer than the 35-70mm.
#2. "RE: Crop factor on D90 one more time!" In response to Reply # 1
Thank you for the prompt and clear response. Your added clarification on the 95% is very useful because I anticipate, given the room I have to work with, it being a challenge to get everyone in the shot and missing ears are not welcomed! Your comment re the Live View is also key especially since I will be using a tripod and thus it's more convenient and I now know more accurat .
Thanks also for the lens reccomendations. May I ask what made you specify those as opposed to F2.8 for example? Cost is always an issue for me but I wondered if there was anything else in your thinking. Thanks as always.
#3. "RE: Crop factor on D90 one more time!" In response to Reply # 2 Wed 21-Nov-12 07:25 PM by briantilley
Faster (i.e. f/2.8) zooms are important for some folks, because they might need to shoot at maximum aperture at least some of the time. The older AF 20-35mm f/2.8D or AF-S 17-35mm f/2.8D Nikkors would be an alternatiove to the 16-35mm if that matters to you. I'd expect image quality to be pretty similar between the three in general terms.
There isn't an f/2.8 zoom that covers the 16-70mm focal length range, so that wouldn't be an option if you needed f/2.8.
One last thing - when you bought your 35-70mm, there was probably a large gap in performance between it and the cheaper "consumer" zooms - that gap has narrowed considerably in the last 20 years.
#5. "RE: Crop factor on D90 one more time!" In response to Reply # 4 Thu 22-Nov-12 12:21 AM by OnTERRYo
Sometimes, in a situation like this, WikiPedia is your friend. FOV seems to be Field Of Vision or Field Of View. Something I have not heard of in the books/manuals I have read. AOV did not have an answer though. FX is "FX format, Nikon's nomenclature for the full-frame digital SLR" (copied from WikiPedia) And DX is digital format; their explanation seems quite informative.
Hope this helps.
"The Nikon did the work; I just happened to be behind it at the time." TP